title: Extremely slow Date range query in Mongodb
body: <p>I developed the application through Mongoose and my query (below) to be 30s to 60s slow.</p>
  
  <p><code>Transaction.find({code: '0001', time: {$lte: new Date(2018-01-02), $gt: new Date(2018-01-01)}});</code></p>
  
  <p>Then I tested with mongo shell with the query (below) didn't seem to help.</p>
  
  <pre><code>db.Transaction.find({code: '0001', time: { $lte: '2018-01-02T00:00:00Z', $gt: '2018-01-01T00:00:00Z'}});`
  </code></pre>
  
  <p>Below are my .explains as well as the collection's stats.</p>
  
  <p>Transaction's stats</p>
  
  <pre><code>{
      "ns" : "TickData.transactions",
      "size" : 6779402152,
      "count" : 72038705,
      "avgObjSize" : 94,
      "storageSize" : 2113564672,
      "capped" : false,
      "wiredTiger" : {
          "metadata" : {
              "formatVersion" : 1
          },
          "creationString" : "access_pattern_hint=none,allocation_size=4KB,app_metadata=(formatVersion=1),assert=(commit_timestamp=none,read_timestamp=none),block_allocation=best,block_compressor=snappy,cache_resident=false,checksum=on,colgroups=,collator=,columns=,dictionary=0,encryption=(keyid=,name=),exclusive=false,extractor=,format=btree,huffman_key=,huffman_value=,ignore_in_memory_cache_size=false,immutable=false,internal_item_max=0,internal_key_max=0,internal_key_truncate=true,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=32KB,leaf_value_max=64MB,log=(enabled=true),lsm=(auto_throttle=true,bloom=true,bloom_bit_count=16,bloom_config=,bloom_hash_count=8,bloom_oldest=false,chunk_count_limit=0,chunk_max=5GB,chunk_size=10MB,merge_custom=(prefix=,start_generation=0,suffix=),merge_max=15,merge_min=0),memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=false,prefix_compression_min=4,source=,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,type=file,value_format=u",
          "type" : "file",
          "uri" : "statistics:table:collection-12--503685154145610087",
          "LSM" : {
              "bloom filter false positives" : 0,
              "bloom filter hits" : 0,
              "bloom filter misses" : 0,
              "bloom filter pages evicted from cache" : 0,
              "bloom filter pages read into cache" : 0,
              "bloom filters in the LSM tree" : 0,
              "chunks in the LSM tree" : 0,
              "highest merge generation in the LSM tree" : 0,
              "queries that could have benefited from a Bloom filter that did not exist" : 0,
              "sleep for LSM checkpoint throttle" : 0,
              "sleep for LSM merge throttle" : 0,
              "total size of bloom filters" : 0
          },
          "block-manager" : {
              "allocations requiring file extension" : 0,
              "blocks allocated" : 0,
              "blocks freed" : 0,
              "checkpoint size" : 2113531904,
              "file allocation unit size" : 4096,
              "file bytes available for reuse" : 16384,
              "file magic number" : 120897,
              "file major version number" : 1,
              "file size in bytes" : 2113564672,
              "minor version number" : 0
          },
          "btree" : {
              "btree checkpoint generation" : 294,
              "column-store fixed-size leaf pages" : 0,
              "column-store internal pages" : 0,
              "column-store variable-size RLE encoded values" : 0,
              "column-store variable-size deleted values" : 0,
              "column-store variable-size leaf pages" : 0,
              "fixed-record size" : 0,
              "maximum internal page key size" : 368,
              "maximum internal page size" : 4096,
              "maximum leaf page key size" : 2867,
              "maximum leaf page size" : 32768,
              "maximum leaf page value size" : 67108864,
              "maximum tree depth" : 5,
              "number of key/value pairs" : 0,
              "overflow pages" : 0,
              "pages rewritten by compaction" : 0,
              "row-store internal pages" : 0,
              "row-store leaf pages" : 0
          },
          "cache" : {
              "bytes currently in the cache" : 1264186983,
              "bytes read into cache" : NumberLong("1641469097316"),
              "bytes written from cache" : 0,
              "checkpoint blocked page eviction" : 0,
              "data source pages selected for eviction unable to be evicted" : 310,
              "eviction walk passes of a file" : 1193252,
              "eviction walk target pages histogram - 0-9" : 3707,
              "eviction walk target pages histogram - 10-31" : 1969,
              "eviction walk target pages histogram - 128 and higher" : 0,
              "eviction walk target pages histogram - 32-63" : 3261,
              "eviction walk target pages histogram - 64-128" : 1184315,
              "eviction walks abandoned" : 16565,
              "eviction walks gave up because they restarted their walk twice" : 0,
              "eviction walks gave up because they saw too many pages and found no candidates" : 1576,
              "eviction walks gave up because they saw too many pages and found too few candidates" : 1464,
              "eviction walks reached end of tree" : 16287,
              "eviction walks started from root of tree" : 19605,
              "eviction walks started from saved location in tree" : 1173647,
              "hazard pointer blocked page eviction" : 205,
              "in-memory page passed criteria to be split" : 0,
              "in-memory page splits" : 0,
              "internal pages evicted" : 150133,
              "internal pages split during eviction" : 0,
              "leaf pages split during eviction" : 0,
              "modified pages evicted" : 0,
              "overflow pages read into cache" : 0,
              "page split during eviction deepened the tree" : 0,
              "page written requiring lookaside records" : 0,
              "pages read into cache" : 57616140,
              "pages read into cache requiring lookaside entries" : 0,
              "pages requested from the cache" : 442748265,
              "pages seen by eviction walk" : 131524175,
              "pages written from cache" : 0,
              "pages written requiring in-memory restoration" : 0,
              "tracked dirty bytes in the cache" : 0,
              "unmodified pages evicted" : 57575155
          },
          "cache_walk" : {
              "Average difference between current eviction generation when the page was last considered" : 0,
              "Average on-disk page image size seen" : 0,
              "Average time in cache for pages that have been visited by the eviction server" : 0,
              "Average time in cache for pages that have not been visited by the eviction server" : 0,
              "Clean pages currently in cache" : 0,
              "Current eviction generation" : 0,
              "Dirty pages currently in cache" : 0,
              "Entries in the root page" : 0,
              "Internal pages currently in cache" : 0,
              "Leaf pages currently in cache" : 0,
              "Maximum difference between current eviction generation when the page was last considered" : 0,
              "Maximum page size seen" : 0,
              "Minimum on-disk page image size seen" : 0,
              "Number of pages never visited by eviction server" : 0,
              "On-disk page image sizes smaller than a single allocation unit" : 0,
              "Pages created in memory and never written" : 0,
              "Pages currently queued for eviction" : 0,
              "Pages that could not be queued for eviction" : 0,
              "Refs skipped during cache traversal" : 0,
              "Size of the root page" : 0,
              "Total number of pages currently in cache" : 0
          },
          "compression" : {
              "compressed pages read" : 57456583,
              "compressed pages written" : 0,
              "page written failed to compress" : 0,
              "page written was too small to compress" : 0,
              "raw compression call failed, additional data available" : 0,
              "raw compression call failed, no additional data available" : 0,
              "raw compression call succeeded" : 0
          },
          "cursor" : {
              "bulk-loaded cursor-insert calls" : 0,
              "create calls" : 3,
              "cursor-insert key and value bytes inserted" : 0,
              "cursor-remove key bytes removed" : 0,
              "cursor-update value bytes updated" : 0,
              "insert calls" : 0,
              "modify calls" : 0,
              "next calls" : 16369888007,
              "prev calls" : 1,
              "remove calls" : 0,
              "reserve calls" : 0,
              "reset calls" : 127918738,
              "restarted searches" : 0,
              "search calls" : 0,
              "search near calls" : 127899373,
              "truncate calls" : 0,
              "update calls" : 0
          },
          "reconciliation" : {
              "dictionary matches" : 0,
              "fast-path pages deleted" : 0,
              "internal page key bytes discarded using suffix compression" : 0,
              "internal page multi-block writes" : 0,
              "internal-page overflow keys" : 0,
              "leaf page key bytes discarded using prefix compression" : 0,
              "leaf page multi-block writes" : 0,
              "leaf-page overflow keys" : 0,
              "maximum blocks required for a page" : 0,
              "overflow values written" : 0,
              "page checksum matches" : 0,
              "page reconciliation calls" : 0,
              "page reconciliation calls for eviction" : 0,
              "pages deleted" : 0
          },
          "session" : {
              "object compaction" : 0,
              "open cursor count" : 3
          },
          "transaction" : {
              "update conflicts" : 0
          }
      },
      "nindexes" : 1,
      "totalIndexSize" : 732811264,
      "indexSizes" : {
          "_id_" : 732811264
      },
      "ok" : 1
  }
  </code></pre>
  
  <p>Transaction's query's explain()</p>
  
  <pre><code>&gt; db.transactions.find({code:'0001',time: {$gte:ISODate("2018-07-03T00:00:00Z"),$lte:ISODate("2018-07-05T00:00:00Z")}}).explain()
  {
      "queryPlanner" : {
          "plannerVersion" : 1,
          "namespace" : "TickData.transactions",
          "indexFilterSet" : false,
          "parsedQuery" : {
              "$and" : [
                  {
                      "code" : {
                          "$eq" : "0001"
                      }
                  },
                  {
                      "time" : {
                          "$lte" : ISODate("2018-07-05T00:00:00Z")
                      }
                  },
                  {
                      "time" : {
                          "$gte" : ISODate("2018-07-03T00:00:00Z")
                      }
                  }
              ]
          },
          "winningPlan" : {
              "stage" : "COLLSCAN",
              "filter" : {
                  "$and" : [
                      {
                          "code" : {
                              "$eq" : "0001"
                          }
                      },
                      {
                          "time" : {
                              "$lte" : ISODate("2018-07-05T00:00:00Z")
                          }
                      },
                      {
                          "time" : {
                              "$gte" : ISODate("2018-07-03T00:00:00Z")
                          }
                      }
                  ]
              },
              "direction" : "forward"
          },
          "rejectedPlans" : [ ]
      },
      "serverInfo" : {
          "host" : "ubuntu-s-1vcpu-1gb-sgp1-01",
          "port" : 27017,
          "version" : "3.6.3",
          "gitVersion" : "9586e557d54ef70f9ca4b43c26892cd55257e1a5"
      },
      "ok" : 1
  }
  &gt; db.transactions.find({code:'0001',time: {$gte:ISODate("2018-07-03T00:00:00Z"),$lte:ISODate("2018-07-05T00:00:00Z")}}).explain()
  {
      "queryPlanner" : {
          "plannerVersion" : 1,
          "namespace" : "TickData.transactions",
          "indexFilterSet" : false,
          "parsedQuery" : {
              "$and" : [
                  {
                      "code" : {
                          "$eq" : "0001"
                      }
                  },
                  {
                      "time" : {
                          "$lte" : ISODate("2018-07-05T00:00:00Z")
                      }
                  },
                  {
                      "time" : {
                          "$gte" : ISODate("2018-07-03T00:00:00Z")
                      }
                  }
              ]
          },
          "winningPlan" : {
              "stage" : "COLLSCAN",
              "filter" : {
                  "$and" : [
                      {
                          "code" : {
                              "$eq" : "0001"
                          }
                      },
                      {
                          "time" : {
                              "$lte" : ISODate("2018-07-05T00:00:00Z")
                          }
                      },
                      {
                          "time" : {
                              "$gte" : ISODate("2018-07-03T00:00:00Z")
                          }
                      }
                  ]
              },
              "direction" : "forward"
          },
          "rejectedPlans" : [ ]
      },
      "serverInfo" : {
          "host" : "ubuntu-s-1vcpu-1gb-sgp1-01",
          "port" : 27017,
          "version" : "3.6.3",
          "gitVersion" : "9586e557d54ef70f9ca4b43c26892cd55257e1a5"
      },
      "ok" : 1
  }
  </code></pre>
  
  <p>How can I improve the query performances?</p>