anchor.diff:      $ ssh gpadmin@<gpmaster>
       ```
   
  -2. Recall the location of the PXF user configuration directory ($PXF_CONF). Edit the `$PXF_CONF/conf/pxf-env.sh` file. For example:
  +2. Recall the location of the PXF user configuration directory (`$PXF_CONF`). Edit the `$PXF_CONF/conf/pxf-env.sh` file. For example:
   
       ``` shell
       gpadmin@gpmaster$ vi $PXF_CONF/conf/pxf-env.sh
  
positive.code:     ``` shell
      PXF_JVM_OPTS="-Xmx3g -Xms3g"
      ```
  
  4. Use the `pxf cluster sync` command to copy the updated `pxf-env.sh` file to the Greenplum Database cluster. For example:
  
  
negative.code: 
  As described in previous sections, you must synchronize the updated PXF configuration to the Greenplum Database cluster and restart the PXF server on each segment host.
  
  ## <a id="pxf-fragcache"></a>PXF Fragment Metadata Caching 
  
  A PXF connector *Fragmenter* uses metadata from the external data source to split data into a list of fragments (blocks, files, etc.) that can be read in parallel. PXF caches the fragment metadata on a per-query basis: the first thread to access a fragment's metadata stores the information in a cache, and other threads reuse this cached metadata. Caching of this nature reduces query memory requirements for external data sources with a large number of fragments.
  
  PXF fragment metadata caching is enabled by default. To turn off fragment metadata caching, or to re-enable it after turning it off, perform the following procedure:
  
  1. Log in to your Greenplum Database master node:
  
      ``` shell
      $ ssh gpadmin@<gpmaster>
      ```
  
  2. Recall the location of the PXF user configuration directory (`$PXF_CONF`). Edit the `$PXF_CONF/conf/pxf-env.sh` file. For example:
  
      ``` shell
      gpadmin@gpmaster$ vi $PXF_CONF/conf/pxf-env.sh
      ```
  
  3. Locate the `PXF_FRAGMENTER_CACHE` setting in the `pxf-env.sh` file. If the setting is commented out, uncomment it, and then update the value. For example, to turn off fragment metadata caching, set the value to `false`:
  
      ``` shell
      export PXF_FRAGMENTER_CACHE=false
      ```
  
  3. Save the file and exit the editor.
  
  4. Use the `pxf cluster sync` command to copy the updated `pxf-env.sh` file to the Greenplum Database cluster. For example:
  
      ``` shell
      gpadmin@gpmaster$ $GPHOME/pxf/bin/pxf cluster sync
      ```
  
  5. Restart PXF on each Greenplum Database segment host as described in [Restarting PXF](cfginitstart_pxf.html#restart_pxf).
  
  