Truncate Performs Slowly and Recursive SQL on SEG$ Shows High Resource Usage on Oracle 12cR1 (12.1)
(Doc ID 2043528.1)
Last updated on FEBRUARY 21, 2019
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199 to 188.8.131.52 [Release 12.1]
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata 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.
- Truncate performs slowly
- Tracing with 10046 shows highest wait on following recursive sql against SEG$:
- AWR report shows high resources used for the SQL:
- The AWR report may also show waits for 'library cache: mutex x', 'library cache locks' and 'cursor:pin S' :
The symptoms may be seen after upgrade to 184.108.40.206
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