High Version Count with CURSOR_SHARING = SIMILAR or FORCE

(Doc ID 261020.1)

Last updated on MAY 24, 2017

Applies to:

Oracle Database - Enterprise Edition - Version and later
Oracle Database - Personal Edition - Version and later
Oracle Database - Standard Edition - Version and later
Information in this document applies to any platform.



High version counts can easily cause high contention for library cache latches. A process parsing a SQL statement with many versions (children cursors) will need to scan
through all these children while holding on to a library cache latch.  This means that other processes needing the same latch will have to wait and can lead to significant database-wide performance degradation.


CURSOR_SHARING has been changed to SIMILAR or FORCE.


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