High Version Counts on Recursive SQL Statements
(Doc ID 1453302.1)
Last updated on FEBRUARY 18, 2019
Applies to:Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.
- Database appears to be hung, users unable to connect to sqlplus or its very slow
- AWR report shows some of the following events in the Top Wait Events:
- library cache load lock
- cursor: pin S wait on X
- library cache: mutex X
- library cache lock
- AWR Section "SQL ordered by Version Count" shows high version counts for recursive (system) sqls:
- The reasons for non-sharing of the sql cursor are: OPTIMIZER_MISMATCH and LANGUAGE_MISMATCH
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