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High Version Count with CURSOR_SHARING = SIMILAR or FORCE (Doc ID 261020.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 9.0.1.0 and later
Oracle Database - Personal Edition - Version 9.0.1.0 and later
Oracle Database - Standard Edition - Version 9.0.1.0 and later
Information in this document applies to any platform.

Symptoms

 


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.

Changes

CURSOR_SHARING has been changed to SIMILAR or FORCE.

Cause

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