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KB-1157 How to reset the analytics engines for on-premise installations of Appian

This article outlines the process to reset the Analytics Engines in on-premise installations of Appian.

NOTE: These steps should only be performed when advised to do so by Appian Technical Support.

  1. Shut down Appian completely, including application server, search server, and the engines. Refer to Starting and Stopping Appian for more information.
  2. Delete all files ending in .kdb in the Analytics Engine gateway directories (<APPIAN_HOME>/server/process/analytics/00XX/gw1).
    Note: If you have additional gateway directories (gwX) with engine database files (pa*.kdb) in them, you need to delete those files as well for each analytics engine.

    Example Unix commands:

    cd <APPIAN_HOME>/server/process/analytics/00**/gw*
    rm pa*.kdb

    Example Windows commands:

    cd <APPIAN_HOME>\server\process\analytics\00**\gw*
    del pa*.kdb
  3. In <APPIAN_HOME>/server/process/analytics, copy the file named pa.kdb into each engine/gateway directory (<APPIAN_HOME>/server/process/analytics/00XX/gwX) and rename each copy to pa1.kdb. Do not rename the original file.
  4. Start the Appian engines. Wait for the CPU usage to stabilize.
  5. Run checkengine.(bat|sh) to ensure all the engines have a status of OKAY.
  6. Start the search server.
  7. Start the application server.

Affected Versions

This article applies to all versions of on-premise installations of Appian.

Last Reviewed: February 2017