High Waits for 'latch: library cache' when Querying V$SESSION / V$ACCESS with Full Table Scan on X$KGLDP
(Doc ID 860915.1)
Last updated on MARCH 03, 2022
Applies to:
Oracle Database - Enterprise Edition - Version 10.2.0.3 to 11.2.0.0 [Release 10.2 to 11.2]Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.
Symptoms
- High Library cache waits (waits for 'latch: library cache') when querying v$session and v$access.
- Excessive time spent on scan of the X$KGLDP fixed table can cause very long latch hold times of library cache latch causing an instance wide hang.
- For example:
Cause
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In this Document
Symptoms |
Cause |
Solution |
References |