text: # This file is a python script that describes the WiredTiger API.
  
  class Method:
      def __init__(self, config):
          # Deal with duplicates: with complex configurations (like
          # WT_SESSION::create), it's simpler to deal with duplicates once than
          # manually as configurations are defined
          self.config = []
          lastname = None
          for c in sorted(config):
              if '.' in c.name:
                  raise "Bad config key '%s'" % c.name
              if c.name == lastname:
                  continue
              lastname = c.name
              self.config.append(c)
  
  class Config:
      def __init__(self, name, default, desc, subconfig=None, **flags):
          self.name = name
          self.default = default
          self.desc = desc
          self.subconfig = subconfig
          self.flags = flags
  
      def __cmp__(self, other):
          return cmp(self.name, other.name)
  
  common_runtime_config = [
      Config('app_metadata', '', r'''
          application-owned metadata for this object'''),
  ]
  
  # Metadata shared by all schema objects
  common_meta = common_runtime_config + [
      Config('collator', 'none', r'''
          configure custom collation for keys.  Permitted values are \c "none"
          or a custom collator name created with WT_CONNECTION::add_collator'''),
      Config('columns', '', r'''
          list of the column names.  Comma-separated list of the form
          <code>(column[,...])</code>.  For tables, the number of entries
          must match the total number of values in \c key_format and \c
          value_format.  For colgroups and indices, all column names must
          appear in the list of columns for the table''',
          type='list'),
  ]
  
  source_meta = [
      Config('source', '', r'''
          set a custom data source URI for a column group, index or simple
          table.  By default, the data source URI is derived from the \c
          type and the column group or index name.  Applications can
          create tables from existing data sources by supplying a \c
          source configuration''', undoc=True),
      Config('type', 'file', r'''
          set the type of data source used to store a column group, index
          or simple table.  By default, a \c "file:" URI is derived from
          the object name.  The \c type configuration can be used to
          switch to a different data source, such as LSM or an extension
          configured by the application'''),
  ]
  
  format_meta = common_meta + [
      Config('key_format', 'u', r'''
          the format of the data packed into key items.  See @ref
          schema_format_types for details.  By default, the key_format is
          \c 'u' and applications use WT_ITEM structures to manipulate
          raw byte arrays. By default, records are stored in row-store
          files: keys of type \c 'r' are record numbers and records
          referenced by record number are stored in column-store files''',
          type='format', func='__wt_struct_confchk'),
      Config('value_format', 'u', r'''
          the format of the data packed into value items.  See @ref
          schema_format_types for details.  By default, the value_format
          is \c 'u' and applications use a WT_ITEM structure to
          manipulate raw byte arrays. Value items of type 't' are
          bitfields, and when configured with record number type keys,
          will be stored using a fixed-length store''',
          type='format', func='__wt_struct_confchk'),
  ]
  
  lsm_config = [
      Config('lsm', '', r'''
          options only relevant for LSM data sources''',
          type='category', subconfig=[
          Config('auto_throttle', 'true', r'''
              Throttle inserts into LSM trees if flushing to disk isn't
              keeping up''',
              type='boolean'),
          Config('bloom', 'true', r'''
              create bloom filters on LSM tree chunks as they are merged''',
              type='boolean'),
          Config('bloom_bit_count', '16', r'''
              the number of bits used per item for LSM bloom filters''',
              min='2', max='1000'),
          Config('bloom_config', '', r'''
              config string used when creating Bloom filter files, passed
              to WT_SESSION::create'''),
          Config('bloom_hash_count', '8', r'''
              the number of hash values per item used for LSM bloom
              filters''',
              min='2', max='100'),
          Config('bloom_oldest', 'false', r'''
              create a bloom filter on the oldest LSM tree chunk. Only
              supported if bloom filters are enabled''',
              type='boolean'),
          Config('chunk_count_limit', '0', r'''
              the maximum number of chunks to allow in an LSM tree. This
              option automatically times out old data. As new chunks are
              added old chunks will be removed. Enabling this option
              disables LSM background merges''',
              type='int'),
          Config('chunk_max', '5GB', r'''
              the maximum size a single chunk can be. Chunks larger than this
              size are not considered for further merges. This is a soft
              limit, and chunks larger than this value can be created.  Must
              be larger than chunk_size''',
              min='100MB', max='10TB'),
          Config('chunk_size', '10MB', r'''
              the maximum size of the in-memory chunk of an LSM tree.  This
              limit is soft - it is possible for chunks to be temporarily
              larger than this value.  This overrides the \c memory_page_max
              setting''',
              min='512K', max='500MB'),
          Config('merge_custom', '', r'''
              configure the tree to merge into a custom data source''',
              type='category', subconfig=[
              Config('prefix', '', r'''
                  custom data source prefix instead of \c "file"'''),
              Config('start_generation', '0', r'''
                  merge generation at which the custom data source is used
                  (zero indicates no custom data source)''',
                  min='0', max='10'),
              Config('suffix', '', r'''
                  custom data source suffix instead of \c ".lsm"'''),
              ]),
          Config('merge_max', '15', r'''
              the maximum number of chunks to include in a merge operation''',
              min='2', max='100'),
          Config('merge_min', '0', r'''
              the minimum number of chunks to include in a merge operation. If
              set to 0 or 1 half the value of merge_max is used''',
              max='100'),
      ]),
  ]
  
  file_runtime_config = common_runtime_config + [
      Config('access_pattern_hint', 'none', r'''
          It is recommended that workloads that consist primarily of
          updates and/or point queries specify \c random.  Workloads that
          do many cursor scans through large ranges of data specify
          \c sequential and other workloads specify \c none.  The
          option leads to an advisory call to an appropriate operating
          system API where available''',
          choices=['none', 'random', 'sequential']),
      Config('cache_resident', 'false', r'''
          do not ever evict the object's pages from cache. Not compatible with
          LSM tables; see @ref tuning_cache_resident for more information''',
          type='boolean'),
      Config('assert', '', r'''
          enable enhanced checking. ''',
          type='category', subconfig= [
          Config('commit_timestamp', 'none', r'''
              verify that timestamps should 'always' or 'never' be used
              on modifications with this table.  Verification is 'none'
              if mixed update use is allowed. If 'key_consistent' is
              set then all updates to a specific key must be the same
              with respect to timestamp usage or not.''',
              choices=['always','key_consistent', 'never','none']),
          Config('read_timestamp', 'none', r'''
              verify that timestamps should 'always' or 'never' be used
              on reads with this table.  Verification is 'none'
              if mixed read use is allowed.''',
              choices=['always','never','none'])
          ], undoc=True),
      Config('log', '', r'''
          the transaction log configuration for this object.  Only valid if
          log is enabled in ::wiredtiger_open''',
          type='category', subconfig=[
          Config('enabled', 'true', r'''
              if false, this object has checkpoint-level durability''',
              type='boolean'),
          ]),
  ]
  
  # Per-file configuration
  file_config = format_meta + file_runtime_config + [
      Config('block_allocation', 'best', r'''
          configure block allocation. Permitted values are \c "first" or
          \c "best"; the \c "first" configuration uses a first-available
          algorithm during block allocation, the \c "best" configuration
          uses a best-fit algorithm''',
          choices=['first', 'best',]),
      Config('allocation_size', '4KB', r'''
          the file unit allocation size, in bytes, must a power-of-two;
          smaller values decrease the file space required by overflow
          items, and the default value of 4KB is a good choice absent
          requirements from the operating system or storage device''',
          min='512B', max='128MB'),
      Config('block_compressor', 'none', r'''
          configure a compressor for file blocks.  Permitted values are \c "none"
          or custom compression engine name created with
          WT_CONNECTION::add_compressor.  If WiredTiger has builtin support for
          \c "lz4", \c "snappy", \c "zlib" or \c "zstd" compression, these names
          are also available.  See @ref compression for more information'''),
      Config('checksum', 'uncompressed', r'''
          configure block checksums; permitted values are <code>on</code>
          (checksum all blocks), <code>off</code> (checksum no blocks) and
          <code>uncompresssed</code> (checksum only blocks which are not
          compressed for any reason).  The \c uncompressed setting is for
          applications which can rely on decompression to fail if a block
          has been corrupted''',
          choices=['on', 'off', 'uncompressed']),
      Config('dictionary', '0', r'''
          the maximum number of unique values remembered in the Btree
          row-store leaf page value dictionary; see
          @ref file_formats_compression for more information''',
          min='0'),
      Config('encryption', '', r'''
          configure an encryptor for file blocks. When a table is created,
          its encryptor is not implicitly used for any related indices
          or column groups''',
          type='category', subconfig=[
          Config('name', 'none', r'''
              Permitted values are \c "none"
              or custom encryption engine name created with
              WT_CONNECTION::add_encryptor.
              See @ref encryption for more information'''),
          Config('keyid', '', r'''
              An identifier that identifies a unique instance of the encryptor.
              It is stored in clear text, and thus is available when
              the wiredtiger database is reopened.  On the first use
              of a (name, keyid) combination, the WT_ENCRYPTOR::customize
              function is called with the keyid as an argument'''),
          ]),
      Config('format', 'btree', r'''
          the file format''',
          choices=['btree']),
      Config('huffman_key', 'none', r'''
          configure Huffman encoding for keys.  Permitted values are
          \c "none", \c "english", \c "utf8<file>" or \c "utf16<file>".
          See @ref huffman for more information'''),
      Config('huffman_value', 'none', r'''
          configure Huffman encoding for values.  Permitted values are
          \c "none", \c "english", \c "utf8<file>" or \c "utf16<file>".
          See @ref huffman for more information'''),
      Config('ignore_in_memory_cache_size', 'false', r'''
          allow update and insert operations to proceed even if the cache is
          already at capacity. Only valid in conjunction with in-memory
          databases. Should be used with caution - this configuration allows
          WiredTiger to consume memory over the configured cache limit''',
          type='boolean'),
      Config('internal_key_truncate', 'true', r'''
          configure internal key truncation, discarding unnecessary trailing
          bytes on internal keys (ignored for custom collators)''',
          type='boolean'),
      Config('internal_page_max', '4KB', r'''
          the maximum page size for internal nodes, in bytes; the size
          must be a multiple of the allocation size and is significant
          for applications wanting to avoid excessive L2 cache misses
          while searching the tree.  The page maximum is the bytes of
          uncompressed data, that is, the limit is applied before any
          block compression is done''',
          min='512B', max='512MB'),
      Config('internal_item_max', '0', r'''
          historic term for internal_key_max''',
          min=0, undoc=True),
      Config('internal_key_max', '0', r'''
          the largest key stored in an internal node, in bytes.  If set, keys
          larger than the specified size are stored as overflow items (which
          may require additional I/O to access).  The default and the maximum
          allowed value are both one-tenth the size of a newly split internal
          page''',
          min='0'),
      Config('key_gap', '10', r'''
          the maximum gap between instantiated keys in a Btree leaf page,
          constraining the number of keys processed to instantiate a
          random Btree leaf page key''',
          min='0', undoc=True),
      Config('leaf_key_max', '0', r'''
          the largest key stored in a leaf node, in bytes.  If set, keys
          larger than the specified size are stored as overflow items (which
          may require additional I/O to access).  The default value is
          one-tenth the size of a newly split leaf page''',
          min='0'),
      Config('leaf_page_max', '32KB', r'''
          the maximum page size for leaf nodes, in bytes; the size must
          be a multiple of the allocation size, and is significant for
          applications wanting to maximize sequential data transfer from
          a storage device.  The page maximum is the bytes of uncompressed
          data, that is, the limit is applied before any block compression
          is done''',
          min='512B', max='512MB'),
      Config('leaf_value_max', '0', r'''
          the largest value stored in a leaf node, in bytes.  If set, values
          larger than the specified size are stored as overflow items (which
          may require additional I/O to access). If the size is larger than
          the maximum leaf page size, the page size is temporarily ignored
          when large values are written. The default is one-half the size of
          a newly split leaf page''',
          min='0'),
      Config('leaf_item_max', '0', r'''
          historic term for leaf_key_max and leaf_value_max''',
          min=0, undoc=True),
      Config('memory_page_max', '5MB', r'''
          the maximum size a page can grow to in memory before being
          reconciled to disk.  The specified size will be adjusted to a lower
          bound of <code>leaf_page_max</code>, and an upper bound of
          <code>cache_size / 10</code>.  This limit is soft - it is possible
          for pages to be temporarily larger than this value.  This setting
          is ignored for LSM trees, see \c chunk_size''',
          min='512B', max='10TB'),
      Config('os_cache_max', '0', r'''
          maximum system buffer cache usage, in bytes.  If non-zero, evict
          object blocks from the system buffer cache after that many bytes
          from this object are read or written into the buffer cache''',
          min=0),
      Config('os_cache_dirty_max', '0', r'''
          maximum dirty system buffer cache usage, in bytes.  If non-zero,
          schedule writes for dirty blocks belonging to this object in the
          system buffer cache after that many bytes from this object are
          written into the buffer cache''',
          min=0),
      Config('prefix_compression', 'false', r'''
          configure prefix compression on row-store leaf pages''',
          type='boolean'),
      Config('prefix_compression_min', '4', r'''
          minimum gain before prefix compression will be used on row-store
          leaf pages''',
          min=0),
      Config('split_deepen_min_child', '0', r'''
          minimum entries in a page to consider deepening the tree. Pages
          will be considered for splitting and deepening the search tree
          as soon as there are more than the configured number of children
          ''',
          type='int', undoc=True),
      Config('split_deepen_per_child', '0', r'''
          entries allocated per child when deepening the tree''',
          type='int', undoc=True),
      Config('split_pct', '90', r'''
          the Btree page split size as a percentage of the maximum Btree
          page size, that is, when a Btree page is split, it will be
          split into smaller pages, where each page is the specified
          percentage of the maximum Btree page size''',
          min='50', max='100'),
  ]
  
  # File metadata, including both configurable and non-configurable (internal)
  file_meta = file_config + [
      Config('checkpoint', '', r'''
          the file checkpoint entries'''),
      Config('checkpoint_lsn', '', r'''
          LSN of the last checkpoint'''),
      Config('id', '', r'''
          the file's ID number'''),
      Config('version', '(major=0,minor=0)', r'''
          the file version'''),
  ]
  
  lsm_meta = file_config + lsm_config + [
      Config('last', '', r'''
          the last allocated chunk ID'''),
      Config('chunks', '', r'''
          active chunks in the LSM tree'''),
      Config('old_chunks', '', r'''
          obsolete chunks in the LSM tree'''),
  ]
  
  table_only_config = [
      Config('colgroups', '', r'''
          comma-separated list of names of column groups.  Each column
          group is stored separately, keyed by the primary key of the
          table.  If no column groups are specified, all columns are
          stored together in a single file.  All value columns in the
          table must appear in at least one column group.  Each column
          group must be created with a separate call to
          WT_SESSION::create''', type='list'),
  ]
  
  index_only_config = [
      Config('extractor', 'none', r'''
          configure custom extractor for indices.  Permitted values are
          \c "none" or an extractor name created with
          WT_CONNECTION::add_extractor'''),
      Config('immutable', 'false', r'''
          configure the index to be immutable - that is an index is not changed
          by any update to a record in the table''', type='boolean'),
  ]
  
  colgroup_meta = common_meta + source_meta
  
  index_meta = format_meta + source_meta + index_only_config + [
      Config('index_key_columns', '', r'''
          number of public key columns''', type='int', undoc=True),
  ]
  
  table_meta = format_meta + table_only_config
  
  # Connection runtime config, shared by conn.reconfigure and wiredtiger_open
  connection_runtime_config = [
      Config('async', '', r'''
          asynchronous operations configuration options''',
          type='category', subconfig=[
          Config('enabled', 'false', r'''
              enable asynchronous operation''',
              type='boolean'),
          Config('ops_max', '1024', r'''
              maximum number of expected simultaneous asynchronous
                  operations''', min='1', max='4096'),
          Config('threads', '2', r'''
              the number of worker threads to service asynchronous requests.
              Each worker thread uses a session from the configured
              session_max''',
                  min='1', max='20'), # !!! Must match WT_ASYNC_MAX_WORKERS
              ]),
      Config('cache_size', '100MB', r'''
          maximum heap memory to allocate for the cache. A database should
          configure either \c cache_size or \c shared_cache but not both''',
          min='1MB', max='10TB'),
      Config('cache_max_wait_ms', '0', r'''
          the maximum number of milliseconds an application thread will wait
          for space to be available in cache before giving up. Default will
          wait forever''',
          min=0),
      Config('cache_overhead', '8', r'''
          assume the heap allocator overhead is the specified percentage, and
          adjust the cache usage by that amount (for example, if there is 10GB
          of data in cache, a percentage of 10 means WiredTiger treats this as
          11GB).  This value is configurable because different heap allocators
          have different overhead and different workloads will have different
          heap allocation sizes and patterns, therefore applications may need to
          adjust this value based on allocator choice and behavior in measured
          workloads''',
          min='0', max='30'),
      Config('checkpoint', '', r'''
          periodically checkpoint the database. Enabling the checkpoint server
          uses a session from the configured session_max''',
          type='category', subconfig=[
          Config('log_size', '0', r'''
              wait for this amount of log record bytes to be written to
                  the log between each checkpoint.  If non-zero, this value will
                  use a minimum of the log file size.  A database can configure
                  both log_size and wait to set an upper bound for checkpoints;
                  setting this value above 0 configures periodic checkpoints''',
              min='0', max='2GB'),
          Config('wait', '0', r'''
              seconds to wait between each checkpoint; setting this value
              above 0 configures periodic checkpoints''',
              min='0', max='100000'),
          ]),
      Config('error_prefix', '', r'''
          prefix string for error messages'''),
      Config('eviction', '', r'''
          eviction configuration options''',
          type='category', subconfig=[
              Config('threads_max', '8', r'''
                  maximum number of threads WiredTiger will start to help evict
                  pages from cache. The number of threads started will vary
                  depending on the current eviction load. Each eviction worker
                  thread uses a session from the configured session_max''',
                  min=1, max=20),
              Config('threads_min', '1', r'''
                  minimum number of threads WiredTiger will start to help evict
                  pages from cache. The number of threads currently running will
                  vary depending on the current eviction load''',
                  min=1, max=20),
              ]),
      Config('eviction_checkpoint_target', '1', r'''
          perform eviction at the beginning of checkpoints to bring the dirty
          content in cache to this level. It is a percentage of the cache size if
          the value is within the range of 0 to 100 or an absolute size when
          greater than 100. The value is not allowed to exceed the \c cache_size.
          Ignored if set to zero or \c in_memory is \c true''',
          min=0, max='10TB'),
      Config('eviction_dirty_target', '5', r'''
          perform eviction in worker threads when the cache contains at least
          this much dirty content. It is a percentage of the cache size if the
          value is within the range of 1 to 100 or an absolute size when greater
          than 100. The value is not allowed to exceed the \c cache_size.''',
          min=1, max='10TB'),
      Config('eviction_dirty_trigger', '20', r'''
          trigger application threads to perform eviction when the cache contains
          at least this much dirty content. It is a percentage of the cache size
          if the value is within the range of 1 to 100 or an absolute size when
          greater than 100. The value is not allowed to exceed the \c cache_size.
          This setting only alters behavior if it is lower than eviction_trigger
          ''', min=1, max='10TB'),
      Config('eviction_target', '80', r'''
          perform eviction in worker threads when the cache contains at least
          this much content. It is a percentage of the cache size if the value is
          within the range of 10 to 100 or an absolute size when greater than 100.
          The value is not allowed to exceed the \c cache_size.''',
          min=10, max='10TB'),
      Config('eviction_trigger', '95', r'''
          trigger application threads to perform eviction when the cache contains
          at least this much content. It is a percentage of the cache size if the
          value is within the range of 10 to 100 or an absolute size when greater
          than 100.  The value is not allowed to exceed the \c cache_size.''',
          min=10, max='10TB'),
      Config('file_manager', '', r'''
          control how file handles are managed''',
          type='category', subconfig=[
          Config('close_handle_minimum', '250', r'''
              number of handles open before the file manager will look for handles
              to close''', min=0),
          Config('close_idle_time', '30', r'''
              amount of time in seconds a file handle needs to be idle
              before attempting to close it. A setting of 0 means that idle
              handles are not closed''', min=0, max=100000),
          Config('close_scan_interval', '10', r'''
              interval in seconds at which to check for files that are
              inactive and close them''', min=1, max=100000),
          ]),
      Config('lsm_manager', '', r'''
          configure database wide options for LSM tree management. The LSM
          manager is started automatically the first time an LSM tree is opened.
          The LSM manager uses a session from the configured session_max''',
          type='category', subconfig=[
          Config('worker_thread_max', '4', r'''
              Configure a set of threads to manage merging LSM trees in
              the database. Each worker thread uses a session handle from
              the configured session_max''',
              min='3',     # !!! Must match WT_LSM_MIN_WORKERS
              max='20'),     # !!! Must match WT_LSM_MAX_WORKERS
          Config('merge', 'true', r'''
              merge LSM chunks where possible''',
              type='boolean')
          ]),
      Config('lsm_merge', 'true', r'''
          merge LSM chunks where possible (deprecated)''',
          type='boolean', undoc=True),
      Config('operation_tracking', '', r'''
          enable tracking of performance-critical functions. See
          @ref operation_tracking for more information''',
          type='category', subconfig=[
              Config('enabled', 'false', r'''
                  enable operation tracking subsystem''',
                  type='boolean'),
              Config('path', '"."', r'''
                  the name of a directory into which operation tracking files are
                  written. The directory must already exist. If the value is not
                  an absolute path, the path is relative to the database home
                  (see @ref absolute_path for more information)'''),
          ]),
      Config('shared_cache', '', r'''
          shared cache configuration options. A database should configure
          either a cache_size or a shared_cache not both. Enabling a
          shared cache uses a session from the configured session_max. A
          shared cache can not have absolute values configured for cache
          eviction settings''',
          type='category', subconfig=[
          Config('chunk', '10MB', r'''
              the granularity that a shared cache is redistributed''',
              min='1MB', max='10TB'),
          Config('name', 'none', r'''
              the name of a cache that is shared between databases or
              \c "none" when no shared cache is configured'''),
          Config('quota', '0', r'''
              maximum size of cache this database can be allocated from the
              shared cache. Defaults to the entire shared cache size''',
              type='int'),
          Config('reserve', '0', r'''
              amount of cache this database is guaranteed to have
              available from the shared cache. This setting is per
              database. Defaults to the chunk size''', type='int'),
          Config('size', '500MB', r'''
              maximum memory to allocate for the shared cache. Setting
              this will update the value if one is already set''',
              min='1MB', max='10TB')
          ]),
      Config('statistics', 'none', r'''
          Maintain database statistics, which may impact performance.
          Choosing "all" maintains all statistics regardless of cost,
          "fast" maintains a subset of statistics that are relatively
          inexpensive, "none" turns off all statistics. The "clear"
          configuration resets statistics after they are gathered,
          where appropriate (for example, a cache size statistic is
          not cleared, while the count of cursor insert operations will
          be cleared).   When "clear" is configured for the database,
          gathered statistics are reset each time a statistics cursor
          is used to gather statistics, as well as each time statistics
          are logged using the \c statistics_log configuration.  See
          @ref statistics for more information''',
          type='list',
          choices=['all', 'cache_walk', 'fast', 'none', 'clear', 'tree_walk']),
      Config('timing_stress_for_test', '', r'''
          enable code that interrupts the usual timing of operations with a goal
          of uncovering race conditions and unexpected blocking. This option is
          intended for use with internal stress testing of WiredTiger.''',
          type='list', undoc=True,
          choices=[
          'checkpoint_slow', 'lookaside_sweep_race', 'split_1', 'split_2',
          'split_3', 'split_4', 'split_5', 'split_6', 'split_7', 'split_8',
          'split_9']),
      Config('verbose', '', r'''
          enable messages for various events. Options are given as a
          list, such as <code>"verbose=[evictserver,read]"</code>''',
          type='list', choices=[
              'api',
              'block',
              'checkpoint',
              'checkpoint_progress',
              'compact',
              'evict',
              'evict_stuck',
              'evictserver',
              'fileops',
              'handleops',
              'log',
              'lookaside',
              'lookaside_activity',
              'lsm',
              'lsm_manager',
              'metadata',
              'mutex',
              'overflow',
              'read',
              'rebalance',
              'reconcile',
              'recovery',
              'recovery_progress',
              'salvage',
              'shared_cache',
              'split',
              'temporary',
              'thread_group',
              'timestamp',
              'transaction',
              'verify',
              'version',
              'write']),
  ]
  
  # wiredtiger_open and WT_CONNECTION.reconfigure compatibility configurations.
  compatibility_configuration_common = [
      Config('release', '', r'''
          compatibility release version string'''),
  ]
  
  connection_reconfigure_compatibility_configuration = [
      Config('compatibility', '', r'''
          set compatibility version of database.  Changing the compatibility
          version requires that there are no active operations for the duration
          of the call.''',
          type='category', subconfig=
          compatibility_configuration_common)
  ]
  wiredtiger_open_compatibility_configuration = [
      Config('compatibility', '', r'''
          set compatibility version of database.  Changing the compatibility
          version requires that there are no active operations for the duration
          of the call.''',
          type='category', subconfig=
          compatibility_configuration_common + [
          Config('require_max', '', r'''
              required maximum compatibility version of existing data files.
              Must be greater than or equal to any release version set in the
              \c release setting. Has no effect if creating the database.'''),
          Config('require_min', '', r'''
              required minimum compatibility version of existing data files.
              Must be less than or equal to any release version set in the
              \c release setting. Has no effect if creating the database.'''),
      ]),
  ]
  
  # wiredtiger_open and WT_CONNECTION.reconfigure log configurations.
  log_configuration_common = [
      Config('archive', 'true', r'''
          automatically archive unneeded log files''',
          type='boolean'),
      Config('prealloc', 'true', r'''
          pre-allocate log files''',
          type='boolean'),
      Config('zero_fill', 'false', r'''
          manually write zeroes into log files''',
          type='boolean')
  ]
  connection_reconfigure_log_configuration = [
      Config('log', '', r'''
          enable logging. Enabling logging uses three sessions from the
          configured session_max''',
          type='category', subconfig=
          log_configuration_common)
  ]
  wiredtiger_open_log_configuration = [
      Config('log', '', r'''
          enable logging. Enabling logging uses three sessions from the
          configured session_max''',
          type='category', subconfig=
          log_configuration_common + [
          Config('enabled', 'false', r'''
              enable logging subsystem''',
              type='boolean'),
          Config('compressor', 'none', r'''
              configure a compressor for log records.  Permitted values are
              \c "none" or custom compression engine name created with
              WT_CONNECTION::add_compressor.  If WiredTiger has builtin support
              for \c "lz4", \c "snappy", \c "zlib" or \c "zstd" compression,
              these names are also available. See @ref compression for more
              information'''),
          Config('file_max', '100MB', r'''
              the maximum size of log files''',
              min='100KB', max='2GB'),
          Config('path', '"."', r'''
              the name of a directory into which log files are written. The
              directory must already exist. If the value is not an absolute path,
              the path is relative to the database home (see @ref absolute_path
              for more information)'''),
          Config('recover', 'on', r'''
              run recovery or error if recovery needs to run after an
              unclean shutdown''',
              choices=['error','on'])
      ]),
  ]
  
  # wiredtiger_open and WT_CONNECTION.reconfigure statistics log configurations.
  statistics_log_configuration_common = [
      Config('json', 'false', r'''
          encode statistics in JSON format''',
          type='boolean'),
      Config('on_close', 'false', r'''log statistics on database close''',
          type='boolean'),
      Config('sources', '', r'''
          if non-empty, include statistics for the list of data source
          URIs, if they are open at the time of the statistics logging.
          The list may include URIs matching a single data source
          ("table:mytable"), or a URI matching all data sources of a
          particular type ("table:")''',
          type='list'),
      Config('timestamp', '"%b %d %H:%M:%S"', r'''
          a timestamp prepended to each log record, may contain strftime
          conversion specifications, when \c json is configured, defaults
          to \c "%FT%Y.000Z"'''),
      Config('wait', '0', r'''
          seconds to wait between each write of the log records; setting
          this value above 0 configures statistics logging''',
          min='0', max='100000'),
  ]
  connection_reconfigure_statistics_log_configuration = [
      Config('statistics_log', '', r'''
          log any statistics the database is configured to maintain,
          to a file.  See @ref statistics for more information. Enabling
          the statistics log server uses a session from the configured
          session_max''',
          type='category', subconfig=
          statistics_log_configuration_common)
  ]
  wiredtiger_open_statistics_log_configuration = [
      Config('statistics_log', '', r'''
          log any statistics the database is configured to maintain,
          to a file.  See @ref statistics for more information. Enabling
          the statistics log server uses a session from the configured
          session_max''',
          type='category', subconfig=
          statistics_log_configuration_common + [
          Config('path', '"."', r'''
              the name of a directory into which statistics files are written.
              The directory must already exist. If the value is not an absolute
              path, the path is relative to the database home (see @ref
              absolute_path for more information)''')
          ])
  ]
  
  session_config = [
      Config('cache_cursors', 'true', r'''
          enable caching of cursors for reuse. Any calls to WT_CURSOR::close
          for a cursor created in this session will mark the cursor
          as cached and keep it available to be reused for later calls
          to WT_SESSION::open_cursor. Cached cursors may be eventually
          closed. This value is inherited from ::wiredtiger_open
          \c cache_cursors''',
          type='boolean'),
      Config('ignore_cache_size', 'false', r'''
          when set, operations performed by this session ignore the cache size
          and are not blocked when the cache is full.  Note that use of this
          option for operations that create cache pressure can starve ordinary
          sessions that obey the cache size.''',
          type='boolean'),
      Config('isolation', 'read-committed', r'''
          the default isolation level for operations in this session''',
          choices=['read-uncommitted', 'read-committed', 'snapshot']),
  ]
  
  wiredtiger_open_common =\
      connection_runtime_config +\
      wiredtiger_open_compatibility_configuration +\
      wiredtiger_open_log_configuration +\
      wiredtiger_open_statistics_log_configuration + [
      Config('buffer_alignment', '-1', r'''
          in-memory alignment (in bytes) for buffers used for I/O.  The
          default value of -1 indicates a platform-specific alignment value
          should be used (4KB on Linux systems when direct I/O is configured,
          zero elsewhere)''',
          min='-1', max='1MB'),
      Config('builtin_extension_config', '', r'''
          A structure where the keys are the names of builtin extensions and the
          values are passed to WT_CONNECTION::load_extension as the \c config
          parameter (for example,
          <code>builtin_extension_config={zlib={compression_level=3}}</code>)'''),
      Config('cache_cursors', 'true', r'''
          enable caching of cursors for reuse. This is the default value
          for any sessions created, and can be overridden in configuring
          \c cache_cursors in WT_CONNECTION.open_session.''',
          type='boolean'),
      Config('checkpoint_sync', 'true', r'''
          flush files to stable storage when closing or writing
          checkpoints''',
          type='boolean'),
      Config('direct_io', '', r'''
          Use \c O_DIRECT on POSIX systems, and \c FILE_FLAG_NO_BUFFERING on
          Windows to access files.  Options are given as a list, such as
          <code>"direct_io=[data]"</code>.  Configuring \c direct_io requires
          care, see @ref tuning_system_buffer_cache_direct_io for important
          warnings.  Including \c "data" will cause WiredTiger data files to use
          direct I/O, including \c "log" will cause WiredTiger log files to use
          direct I/O, and including \c "checkpoint" will cause WiredTiger data
          files opened at a checkpoint (i.e: read only) to use direct I/O.
          \c direct_io should be combined with \c write_through to get the
          equivalent of \c O_DIRECT on Windows''',
          type='list', choices=['checkpoint', 'data', 'log']),
      Config('encryption', '', r'''
          configure an encryptor for system wide metadata and logs.
          If a system wide encryptor is set, it is also used for
          encrypting data files and tables, unless encryption configuration
          is explicitly set for them when they are created with
          WT_SESSION::create''',
          type='category', subconfig=[
          Config('name', 'none', r'''
              Permitted values are \c "none"
              or custom encryption engine name created with
              WT_CONNECTION::add_encryptor.
              See @ref encryption for more information'''),
          Config('keyid', '', r'''
              An identifier that identifies a unique instance of the encryptor.
              It is stored in clear text, and thus is available when
              the wiredtiger database is reopened.  On the first use
              of a (name, keyid) combination, the WT_ENCRYPTOR::customize
              function is called with the keyid as an argument'''),
          Config('secretkey', '', r'''
              A string that is passed to the WT_ENCRYPTOR::customize function.
              It is never stored in clear text, so must be given to any
              subsequent ::wiredtiger_open calls to reopen the database.
              It must also be provided to any "wt" commands used with
              this database'''),
          ]),
      Config('extensions', '', r'''
          list of shared library extensions to load (using dlopen).
          Any values specified to a library extension are passed to
          WT_CONNECTION::load_extension as the \c config parameter
          (for example,
          <code>extensions=(/path/ext.so={entry=my_entry})</code>)''',
          type='list'),
      Config('file_extend', '', r'''
          file extension configuration.  If set, extend files of the set
          type in allocations of the set size, instead of a block at a
          time as each new block is written.  For example,
          <code>file_extend=(data=16MB)</code>''',
          type='list', choices=['data', 'log']),
      Config('hazard_max', '1000', r'''
          maximum number of simultaneous hazard pointers per session
          handle''',
          min=15, undoc=True),
      Config('mmap', 'true', r'''
          Use memory mapping to access files when possible''',
          type='boolean'),
      Config('multiprocess', 'false', r'''
          permit sharing between processes (will automatically start an
          RPC server for primary processes and use RPC for secondary
          processes). <b>Not yet supported in WiredTiger</b>''',
          type='boolean'),
      Config('readonly', 'false', r'''
          open connection in read-only mode.  The database must exist.  All
          methods that may modify a database are disabled.  See @ref readonly
          for more information''',
          type='boolean'),
      Config('session_max', '100', r'''
          maximum expected number of sessions (including server
          threads)''',
          min='1'),
      Config('session_scratch_max', '2MB', r'''
          maximum memory to cache in each session''',
          type='int', undoc=True),
      Config('session_table_cache', 'true', r'''
          Maintain a per-session cache of tables''',
          type='boolean', undoc=True), # Obsolete after WT-3476
      Config('transaction_sync', '', r'''
          how to sync log records when the transaction commits''',
          type='category', subconfig=[
          Config('enabled', 'false', r'''
              whether to sync the log on every commit by default, can be
              overridden by the \c sync setting to
              WT_SESSION::commit_transaction''',
              type='boolean'),
          Config('method', 'fsync', r'''
              the method used to ensure log records are stable on disk, see
              @ref tune_durability for more information''',
              choices=['dsync', 'fsync', 'none']),
          ]),
      Config('write_through', '', r'''
          Use \c FILE_FLAG_WRITE_THROUGH on Windows to write to files.  Ignored
          on non-Windows systems.  Options are given as a list, such as
          <code>"write_through=[data]"</code>.  Configuring \c write_through
          requires care, see @ref tuning_system_buffer_cache_direct_io for
          important warnings.  Including \c "data" will cause WiredTiger data
          files to write through cache, including \c "log" will cause WiredTiger
          log files to write through cache. \c write_through should be combined
          with \c direct_io to get the equivalent of POSIX \c O_DIRECT on
          Windows''',
          type='list', choices=['data', 'log']),
  ]
  
  wiredtiger_open = wiredtiger_open_common + [
     Config('config_base', 'true', r'''
          write the base configuration file if creating the database.  If
          \c false in the config passed directly to ::wiredtiger_open, will
          ignore any existing base configuration file in addition to not creating
          one.  See @ref config_base for more information''',
          type='boolean'),
      Config('create', 'false', r'''
          create the database if it does not exist''',
          type='boolean'),
      Config('exclusive', 'false', r'''
          fail if the database already exists, generally used with the
          \c create option''',
          type='boolean'),
      Config('in_memory', 'false', r'''
          keep data in-memory only. See @ref in_memory for more information''',
          type='boolean'),
      Config('use_environment', 'true', r'''
          use the \c WIREDTIGER_CONFIG and \c WIREDTIGER_HOME environment
          variables if the process is not running with special privileges.
          See @ref home for more information''',
          type='boolean'),
      Config('use_environment_priv', 'false', r'''
          use the \c WIREDTIGER_CONFIG and \c WIREDTIGER_HOME environment
          variables even if the process is running with special privileges.
          See @ref home for more information''',
          type='boolean'),
  ]
  
  cursor_runtime_config = [
      Config('append', 'false', r'''
          append the value as a new record, creating a new record
          number key; valid only for cursors with record number keys''',
          type='boolean'),
      Config('overwrite', 'true', r'''
          configures whether the cursor's insert, update and remove
          methods check the existing state of the record.  If \c overwrite
          is \c false, WT_CURSOR::insert fails with ::WT_DUPLICATE_KEY
          if the record exists, WT_CURSOR::update and WT_CURSOR::remove
          fail with ::WT_NOTFOUND if the record does not exist''',
          type='boolean'),
  ]
  
  methods = {
  'colgroup.meta' : Method(colgroup_meta),
  
  'file.config' : Method(file_config),
  
  'file.meta' : Method(file_meta),
  
  'index.meta' : Method(index_meta),
  
  'lsm.meta' : Method(lsm_meta),
  
  'table.meta' : Method(table_meta),
  
  'WT_CURSOR.close' : Method([]),
  
  'WT_CURSOR.reconfigure' : Method(cursor_runtime_config),
  
  'WT_SESSION.alter' : Method(file_runtime_config + [
      Config('exclusive_refreshed', 'true', r'''
          refresh the in memory state and flush the metadata change to disk,
          disabling this flag is dangerous - it will only re-write the
          metadata without refreshing the in-memory information or creating
          a checkpoint. The update will also only be applied to table URI
          entries in the metadata, not their sub-entries.''',
          type='boolean', undoc=True),
  ]),
  
  'WT_SESSION.close' : Method([]),
  
  'WT_SESSION.compact' : Method([
      Config('timeout', '1200', r'''
          maximum amount of time to allow for compact in seconds. The
          actual amount of time spent in compact may exceed the configured
          value. A value of zero disables the timeout''',
          type='int'),
  ]),
  
  'WT_SESSION.create' : Method(file_config + lsm_config + source_meta +
          index_only_config + table_only_config + [
      Config('exclusive', 'false', r'''
          fail if the object exists.  When false (the default), if the
          object exists, check that its settings match the specified
          configuration''',
          type='boolean'),
  ]),
  
  'WT_SESSION.drop' : Method([
      Config('checkpoint_wait', 'true', r'''
          wait for concurrent checkpoints to complete before attempting the drop
          operation. If \c checkpoint_wait=false, attempt the drop operation
          without waiting, returning EBUSY if the operation conflicts with a
          running checkpoint''',
          type='boolean', undoc=True),
      Config('force', 'false', r'''
          return success if the object does not exist''',
          type='boolean'),
      Config('lock_wait', 'true', r'''
          wait for locks, if \c lock_wait=false, fail if any required locks are
          not available immediately''',
          type='boolean', undoc=True),
      Config('remove_files', 'true', r'''
          if the underlying files should be removed''',
          type='boolean'),
  ]),
  
  'WT_SESSION.join' : Method([
      Config('compare', '"eq"', r'''
          modifies the set of items to be returned so that the index key
          satisfies the given comparison relative to the key set in this
          cursor''',
          choices=['eq', 'ge', 'gt', 'le', 'lt']),
      Config('count', '', r'''
          set an approximate count of the elements that would be included in
          the join.  This is used in sizing the bloom filter, and also influences
          evaluation order for cursors in the join. When the count is equal
          for multiple bloom filters in a composition of joins, the bloom
          filter may be shared''',
          type='int'),
      Config('bloom_bit_count', '16', r'''
          the number of bits used per item for the bloom filter''',
          min='2', max='1000'),
      Config('bloom_false_positives', 'false', r'''
          return all values that pass the bloom filter, without eliminating
          any false positives''',
          type='boolean'),
      Config('bloom_hash_count', '8', r'''
          the number of hash values per item for the bloom filter''',
          min='2', max='100'),
      Config('operation', '"and"', r'''
          the operation applied between this and other joined cursors.
          When "operation=and" is specified, all the conditions implied by
          joins must be satisfied for an entry to be returned by the join cursor;
          when "operation=or" is specified, only one must be satisfied.
          All cursors joined to a join cursor must have matching operations''',
          choices=['and', 'or']),
      Config('strategy', '', r'''
          when set to bloom, a bloom filter is created and populated for
          this index. This has an up front cost but may reduce the number
          of accesses to the main table when iterating the joined cursor.
          The bloom setting requires that count be set''',
          choices=['bloom', 'default']),
  ]),
  
  'WT_SESSION.log_flush' : Method([
      Config('sync', 'on', r'''
          forcibly flush the log and wait for it to achieve the synchronization
          level specified.  The \c background setting initiates a background
          synchronization intended to be used with a later call to
          WT_SESSION::transaction_sync.  The \c off setting forces any
          buffered log records to be written to the file system.  The
          \c on setting forces log records to be written to the storage device''',
          choices=['background', 'off', 'on']),
  ]),
  
  'WT_SESSION.log_printf' : Method([]),
  
  'WT_SESSION.open_cursor' : Method(cursor_runtime_config + [
      Config('bulk', 'false', r'''
          configure the cursor for bulk-loading, a fast, initial load path
          (see @ref tune_bulk_load for more information).  Bulk-load may
          only be used for newly created objects and applications should
          use the WT_CURSOR::insert method to insert rows.  When
          bulk-loading, rows must be loaded in sorted order.  The value
          is usually a true/false flag; when bulk-loading fixed-length
          column store objects, the special value \c bitmap allows chunks
          of a memory resident bitmap to be loaded directly into a file
          by passing a \c WT_ITEM to WT_CURSOR::set_value where the \c
          size field indicates the number of records in the bitmap (as
          specified by the object's \c value_format configuration).
          Bulk-loaded bitmap values must end on a byte boundary relative
          to the bit count (except for the last set of values loaded)'''),
      Config('checkpoint', '', r'''
          the name of a checkpoint to open (the reserved name
          "WiredTigerCheckpoint" opens the most recent internal
          checkpoint taken for the object).  The cursor does not
          support data modification'''),
      Config('checkpoint_wait', 'true', r'''
          wait for the checkpoint lock, if \c checkpoint_wait=false, open the
          cursor without taking a lock, returning EBUSY if the operation
          conflicts with a running checkpoint''',
          type='boolean', undoc=True),
      Config('dump', '', r'''
          configure the cursor for dump format inputs and outputs: "hex"
          selects a simple hexadecimal format, "json" selects a JSON format
          with each record formatted as fields named by column names if
          available, and "print" selects a format where only non-printing
          characters are hexadecimal encoded.  These formats are compatible
          with the @ref util_dump and @ref util_load commands''',
          choices=['hex', 'json', 'print']),
      Config('next_random', 'false', r'''
          configure the cursor to return a pseudo-random record from the
          object when the WT_CURSOR::next method is called; valid only for
          row-store cursors. See @ref cursor_random for details''',
          type='boolean'),
      Config('next_random_sample_size', '0', r'''
          cursors configured by \c next_random to return pseudo-random
          records from the object randomly select from the entire object,
          by default. Setting \c next_random_sample_size to a non-zero
          value sets the number of samples the application expects to take
          using the \c next_random cursor. A cursor configured with both
          \c next_random and \c next_random_sample_size attempts to divide
          the object into \c next_random_sample_size equal-sized pieces,
          and each retrieval returns a record from one of those pieces. See
          @ref cursor_random for details'''),
      Config('raw', 'false', r'''
          ignore the encodings for the key and value, manage data as if
          the formats were \c "u".  See @ref cursor_raw for details''',
          type='boolean'),
      Config('readonly', 'false', r'''
          only query operations are supported by this cursor. An error is
          returned if a modification is attempted using the cursor.  The
          default is false for all cursor types except for log and metadata
          cursors''',
          type='boolean'),
      Config('skip_sort_check', 'false', r'''
          skip the check of the sort order of each bulk-loaded key''',
          type='boolean', undoc=True),
      Config('statistics', '', r'''
          Specify the statistics to be gathered.  Choosing "all" gathers
          statistics regardless of cost and may include traversing on-disk files;
          "fast" gathers a subset of relatively inexpensive statistics.  The
          selection must agree with the database \c statistics configuration
          specified to ::wiredtiger_open or WT_CONNECTION::reconfigure.  For
          example, "all" or "fast" can be configured when the database is
          configured with "all", but the cursor open will fail if "all" is
          specified when the database is configured with "fast", and the cursor
          open will fail in all cases when the database is configured with
          "none".  If "size" is configured, only the underlying size of the
          object on disk is filled in and the object is not opened.  If \c
          statistics is not configured, the default configuration is the database
          configuration.  The "clear" configuration resets statistics after
          gathering them, where appropriate (for example, a cache size statistic
          is not cleared, while the count of cursor insert operations will be
          cleared).  See @ref statistics for more information''',
          type='list',
          choices=['all', 'cache_walk', 'fast', 'clear', 'size', 'tree_walk']),
      Config('target', '', r'''
          if non-empty, backup the list of objects; valid only for a
          backup data source''',
          type='list'),
  ]),
  
  'WT_SESSION.rebalance' : Method([]),
  'WT_SESSION.rename' : Method([]),
  'WT_SESSION.reset' : Method([]),
  'WT_SESSION.salvage' : Method([
      Config('force', 'false', r'''
          force salvage even of files that do not appear to be WiredTiger
          files''',
          type='boolean'),
  ]),
  'WT_SESSION.strerror' : Method([]),
  'WT_SESSION.transaction_sync' : Method([
      Config('timeout_ms', '1200000', # !!! Must match WT_SESSION_BG_SYNC_MSEC
          r'''
          maximum amount of time to wait for background sync to complete in
          milliseconds.  A value of zero disables the timeout and returns
          immediately''',
          type='int'),
  ]),
  
  'WT_SESSION.truncate' : Method([]),
  'WT_SESSION.upgrade' : Method([]),
  'WT_SESSION.verify' : Method([
      Config('dump_address', 'false', r'''
          Display addresses and page types as pages are verified,
          using the application's message handler, intended for debugging''',
          type='boolean'),
      Config('dump_blocks', 'false', r'''
          Display the contents of on-disk blocks as they are verified,
          using the application's message handler, intended for debugging''',
          type='boolean'),
      Config('dump_layout', 'false', r'''
          Display the layout of the files as they are verified, using the
          application's message handler, intended for debugging; requires
          optional support from the block manager''',
          type='boolean'),
      Config('dump_offsets', '', r'''
          Display the contents of specific on-disk blocks,
          using the application's message handler, intended for debugging''',
          type='list'),
      Config('dump_pages', 'false', r'''
          Display the contents of in-memory pages as they are verified,
          using the application's message handler, intended for debugging''',
          type='boolean'),
      Config('strict', 'false', r'''
          Treat any verification problem as an error; by default, verify will
          warn, but not fail, in the case of errors that won't affect future
          behavior (for example, a leaked block)''',
          type='boolean')
  ]),
  
  'WT_SESSION.begin_transaction' : Method([
      Config('ignore_prepare', 'false', r'''
          whether to ignore the updates by other prepared transactions as part of
          read operations of this transaction''',
          type='boolean'),
      Config('isolation', '', r'''
          the isolation level for this transaction; defaults to the
          session's isolation level''',
          choices=['read-uncommitted', 'read-committed', 'snapshot']),
      Config('name', '', r'''
          name of the transaction for tracing and debugging'''),
      Config('priority', 0, r'''
          priority of the transaction for resolving conflicts.
          Transactions with higher values are less likely to abort''',
          min='-100', max='100'),
      Config('read_timestamp', '', r'''
          read using the specified timestamp.  The supplied value must not be
          older than the current oldest timestamp.  See
          @ref transaction_timestamps'''),
      Config('round_to_oldest', 'false', r'''
          if read timestamp is earlier than oldest timestamp,
          read timestamp will be rounded to oldest timestamp''',
          type='boolean'),
      Config('snapshot', '', r'''
          use a named, in-memory snapshot, see
          @ref transaction_named_snapshots'''),
      Config('sync', '', r'''
          whether to sync log records when the transaction commits,
          inherited from ::wiredtiger_open \c transaction_sync''',
          type='boolean'),
  ]),
  
  'WT_SESSION.commit_transaction' : Method([
      Config('commit_timestamp', '', r'''
          set the commit timestamp for the current transaction.  The supplied
          value must not be older than the first commit timestamp set for the
          current transaction.  The value must also not be older than the
          current oldest and stable timestamps.  See
          @ref transaction_timestamps'''),
      Config('sync', '', r'''
          override whether to sync log records when the transaction commits,
          inherited from ::wiredtiger_open \c transaction_sync.
          The \c background setting initiates a background
          synchronization intended to be used with a later call to
          WT_SESSION::transaction_sync.  The \c off setting does not
          wait for record to be written or synchronized.  The
          \c on setting forces log records to be written to the storage device''',
          choices=['background', 'off', 'on']),
  ]),
  
  'WT_SESSION.prepare_transaction' : Method([
      Config('prepare_timestamp', '', r'''
          set the prepare timestamp for the updates of the current transaction.
          The supplied value must not be older than any active read timestamps.
          This configuration option is mandatory.  See
          @ref transaction_timestamps'''),
  ]),
  
  'WT_SESSION.timestamp_transaction' : Method([
      Config('commit_timestamp', '', r'''
          set the commit timestamp for the current transaction.  The supplied
          value must not be older than the first commit timestamp set for the
          current transaction.  The value must also not be older than the
          current oldest and stable timestamps.  See
          @ref transaction_timestamps'''),
      Config('read_timestamp', '', r'''
          read using the specified timestamp.  The supplied value must not be
          older than the current oldest timestamp.  This can only be set once
          for a transaction.  @ref transaction_timestamps'''),
      Config('round_to_oldest', 'false', r'''
          if read timestamp is earlier than oldest timestamp,
          read timestamp will be rounded to oldest timestamp''',
          type='boolean'),
  ]),
  
  'WT_SESSION.rollback_transaction' : Method([]),
  
  'WT_SESSION.checkpoint' : Method([
      Config('drop', '', r'''
          specify a list of checkpoints to drop.
          The list may additionally contain one of the following keys:
          \c "from=all" to drop all checkpoints,
          \c "from=<checkpoint>" to drop all checkpoints after and
          including the named checkpoint, or
          \c "to=<checkpoint>" to drop all checkpoints before and
          including the named checkpoint.  Checkpoints cannot be
          dropped while a hot backup is in progress or if open in
          a cursor''', type='list'),
      Config('force', 'false', r'''
          by default, checkpoints may be skipped if the underlying object
          has not been modified, this option forces the checkpoint''',
          type='boolean'),
      Config('name', '', r'''
          if set, specify a name for the checkpoint (note that checkpoints
          including LSM trees may not be named)'''),
      Config('target', '', r'''
          if non-empty, checkpoint the list of objects''', type='list'),
      Config('use_timestamp', 'true', r'''
          by default, create the checkpoint as of the last stable timestamp
          if timestamps are in use, or all current updates if there is no
          stable timestamp set.  If false, this option generates a checkpoint
          with all updates including those later than the timestamp''',
          type='boolean'),
  ]),
  
  'WT_SESSION.snapshot' : Method([
      Config('drop', '', r'''
              if non-empty, specifies which snapshots to drop. Where a group
              of snapshots are being dropped, the order is based on snapshot
              creation order not alphanumeric name order''',
          type='category', subconfig=[
          Config('all', 'false', r'''
              drop all named snapshots''', type='boolean'),
          Config('before', '', r'''
              drop all snapshots up to but not including the specified name'''),
          Config('names', '', r'''
              drop specific named snapshots''', type='list'),
          Config('to', '', r'''
              drop all snapshots up to and including the specified name'''),
      ]),
      Config('include_updates', 'false', r'''
          make updates from the current transaction visible to users of the
          named snapshot.  Transactions started with such a named snapshot are
          restricted to being read-only''', type='boolean'),
      Config('name', '', r'''specify a name for the snapshot'''),
  ]),
  
  'WT_CONNECTION.add_collator' : Method([]),
  'WT_CONNECTION.add_compressor' : Method([]),
  'WT_CONNECTION.add_data_source' : Method([]),
  'WT_CONNECTION.add_encryptor' : Method([]),
  'WT_CONNECTION.add_extractor' : Method([]),
  'WT_CONNECTION.async_new_op' : Method([
      Config('append', 'false', r'''
          append the value as a new record, creating a new record
          number key; valid only for operations with record number keys''',
          type='boolean'),
      Config('overwrite', 'true', r'''
          configures whether the cursor's insert, update and remove
          methods check the existing state of the record.  If \c overwrite
          is \c false, WT_CURSOR::insert fails with ::WT_DUPLICATE_KEY
          if the record exists, WT_CURSOR::update and WT_CURSOR::remove
          fail with ::WT_NOTFOUND if the record does not exist''',
          type='boolean'),
      Config('raw', 'false', r'''
          ignore the encodings for the key and value, manage data as if
          the formats were \c "u".  See @ref cursor_raw for details''',
          type='boolean'),
      Config('timeout', '1200', r'''
          maximum amount of time to allow for compact in seconds. The
          actual amount of time spent in compact may exceed the configured
          value. A value of zero disables the timeout''',
          type='int'),
  ]),
  'WT_CONNECTION.close' : Method([
      Config('leak_memory', 'false', r'''
          don't free memory during close''',
          type='boolean'),
      Config('use_timestamp', 'true', r'''
          by default, create the close checkpoint as of the last stable timestamp
          if timestamps are in use, or all current updates if there is no
          stable timestamp set.  If false, this option generates a checkpoint
          with all updates''',
          type='boolean'),
  ]),
  'WT_CONNECTION.debug_info' : Method([
      Config('cache', 'false', r'''
          print cache information''', type='boolean'),
      Config('cursors', 'false', r'''
          print all open cursor information''', type='boolean'),
      Config('handles', 'false', r'''
          print open handles information''', type='boolean'),
      Config('log', 'false', r'''
          print log information''', type='boolean'),
      Config('sessions', 'false', r'''
          print open session information''', type='boolean'),
      Config('txn', 'false', r'''
          print global txn information''', type='boolean'),
  ]),
  'WT_CONNECTION.reconfigure' : Method(
      connection_reconfigure_compatibility_configuration +\
      connection_reconfigure_log_configuration +\
      connection_reconfigure_statistics_log_configuration +\
      connection_runtime_config
  ),
  'WT_CONNECTION.set_file_system' : Method([]),
  
  'WT_CONNECTION.load_extension' : Method([
      Config('config', '', r'''
          configuration string passed to the entry point of the
          extension as its WT_CONFIG_ARG argument'''),
      Config('early_load', 'false', r'''
          whether this extension should be loaded at the beginning of
          ::wiredtiger_open. Only applicable to extensions loaded via the
          wiredtiger_open configurations string''',
          type='boolean'),
      Config('entry', 'wiredtiger_extension_init', r'''
          the entry point of the extension, called to initialize the
          extension when it is loaded.  The signature of the function
          must match ::wiredtiger_extension_init'''),
      Config('terminate', 'wiredtiger_extension_terminate', r'''
          an optional function in the extension that is called before
          the extension is unloaded during WT_CONNECTION::close.  The
          signature of the function must match
          ::wiredtiger_extension_terminate'''),
  ]),
  
  'WT_CONNECTION.open_session' : Method(session_config),
  
  'WT_CONNECTION.query_timestamp' : Method([
      Config('get', 'all_committed', r'''
          specify which timestamp to query: \c all_committed returns the largest
          timestamp such that all timestamps up to that value have committed,
          \c oldest returns the most recent \c oldest_timestamp set with
          WT_CONNECTION::set_timestamp, \c pinned returns the minimum of the
          \c oldest_timestamp and the read timestamps of all active readers, and
          \c stable returns the most recent \c stable_timestamp set with
          WT_CONNECTION::set_timestamp.  See @ref transaction_timestamps''',
          choices=['all_committed','last_checkpoint',
              'oldest','pinned','recovery','stable']),
  ]),
  
  'WT_CONNECTION.set_timestamp' : Method([
      Config('commit_timestamp', '', r'''
          reset the maximum commit timestamp tracked by WiredTiger.  This will
          cause future calls to WT_CONNECTION::query_timestamp to ignore commit
          timestamps greater than the specified value until the next commit moves
          the tracked commit timestamp forwards.  This is only intended for use
          where the application is rolling back locally committed transactions.
          The supplied value must not be older than the current oldest and
          stable timestamps.  See @ref transaction_timestamps'''),
      Config('force', 'false', r'''
          set timestamps even if they violate normal ordering requirements.
          For example allow the \c oldest_timestamp to move backwards''',
          type='boolean'),
      Config('oldest_timestamp', '', r'''
          future commits and queries will be no earlier than the specified
          timestamp.  Supplied values must be monotonically increasing, any
          attempt to set the value to older than the current is silently ignored.
          The supplied value must not be newer than the current
          stable timestamp.  See @ref transaction_timestamps'''),
      Config('stable_timestamp', '', r'''
          checkpoints will not include commits that are newer than the specified
          timestamp in tables configured with \c log=(enabled=false).  Supplied
          values must be monotonically increasing, any attempt to set the value to
          older than the current is silently ignored.  The supplied value must
          not be older than the current oldest timestamp.  See
          @ref transaction_timestamps'''),
  ]),
  
  'WT_CONNECTION.rollback_to_stable' : Method([]),
  
  'WT_SESSION.reconfigure' : Method(session_config),
  
  # There are 4 variants of the wiredtiger_open configurations.
  # wiredtiger_open:
  #    Configuration values allowed in the application's configuration
  #    argument to the wiredtiger_open call.
  # wiredtiger_open_basecfg:
  #    Configuration values allowed in the WiredTiger.basecfg file (remove
  # creation-specific configuration strings and add a version string).
  # wiredtiger_open_usercfg:
  #    Configuration values allowed in the WiredTiger.config file (remove
  # creation-specific configuration strings).
  # wiredtiger_open_all:
  #    All of the above configuration values combined
  'wiredtiger_open' : Method(wiredtiger_open),
  'wiredtiger_open_basecfg' : Method(wiredtiger_open_common + [
      Config('version', '(major=0,minor=0)', r'''
          the file version'''),
  ]),
  'wiredtiger_open_usercfg' : Method(wiredtiger_open_common),
  'wiredtiger_open_all' : Method(wiredtiger_open + [
      Config('version', '(major=0,minor=0)', r'''
          the file version'''),
  ]),
  }
  