Generating AWR Snapshot is Slow and Causes Many Waits for 'control file sequential read'
(Doc ID 941761.1)
Last updated on MAY 12, 2022
Applies to:
Oracle Database - Enterprise Edition - Version 11.2.0.4 to 11.2.0.4 [Release 11.2]Oracle Database - Enterprise Edition - Version 11.1.0.7 to 11.2.0.1 [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.
Symptoms
- 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':
Changes
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |