Generating AWR Snapshot is Slow and Causes Many Waits for 'control file sequential read'
(Doc ID 941761.1)
Last updated on FEBRUARY 14, 2019
Applies to:Oracle Database - Enterprise Edition - Version 220.127.116.11 to 18.104.22.168 [Release 11.2]
Oracle Database - Enterprise Edition - Version 22.214.171.124 to 126.96.36.199 [Release 11.1 to 11.2]
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
Information in this document applies to any platform.
- Generating AWR snapshots take a long time
- Generation is waiting for wait event 'control file sequential read'
- From the 10046 we can see inserts into wrh$_thread taking a long time. In this TKProf example we can see that this insert alone took over 35 minutes with half of that waiting for 'control file sequential read':
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