Queries Using SQL Plan Baselines are Slow or Hang During Parse Waiting for 'row cache lock'
(Doc ID 2027839.1)
Last updated on FEBRUARY 21, 2019
Applies to:
Oracle Database - Enterprise Edition - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud 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
- Session waits for 'row cache lock':
- Active Session History (ASH) report identifies the top SQL waiting for the event:
- Query has a SQL Plan Baseline defined for it
- The parsing session is on CPU (Not in wait):
- This causes a Higher Shared Pool memory allocation for the component 'SMODI':
- Dropping of SQL Plan Baseline that causes the issue may also be slow or appear to hang.
Changes
Database upgraded to 12.1.0.2 or SQL Plan Baseline added
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |