If this property is set to true (the default), outdated index cardinality statistics are updated automatically during query compilation. The query compiler schedules a job that updates the statistics in a separate thread.
The thread that updates the statistics in the background may affect the performance of the user threads. If this causes problems, you can set derby.storage.indexStats.auto to false.
To diagnose problems with automatic updating of index statistics, an application can set the property derby.storage.indexStats.log to true. The derby.storage.indexStats.trace property can be used to provide more detailed information.
For more information about index statistics, see "Working with cardinality statistics" in Tuning Derby.
-- system-wide property derby.storage.indexStats.auto=false
-- database-level property CALL SYSCS_UTIL.SYSCS_SET_DATABASE_PROPERTY( 'derby.storage.indexStats.auto', 'false')
Static. For system-wide properties, you must reboot Derby for the change to take effect. For database-wide properties, you must reboot the database for the change to take effect.