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How to Analyze Library Cache Timeout with Associated: ORA-04021 'timeout occurred while waiting to lock object %s%s%s%s%s.' Errors
(Doc ID 1486712.1)
Last updated on AUGUST 21, 2023 Applies to:
Oracle Database - Standard Edition - Version 8.1.5.0 and laterOracle Database Cloud Schema Service - Version N/A and laterOracle Database Exadata Express Cloud Service - Version N/A and laterGen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and laterOracle Cloud Infrastructure - Database Service - Version N/A and laterInformation in this document applies to any platform.
Purpose
This Document discusses library cache locks and pins and how to analyze locking problems in this area.
Troubleshooting Steps
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In this Document
Purpose
Troubleshooting Steps
Why does ORA-4021 error occur?
Which views can be used to detect library locking problems?
How to find out why an ORA-4021 occurs?
What type of objects can be locked in a library cache?
Which lock/pin mode is required for which type of action?
Common ora-4021 and ora-4020 situations
Known issues:
References
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