Tracing Sessions: Waiting On An Enqueue
(Doc ID 1400250.1)
Last updated on MARCH 03, 2022
Applies to:Oracle Database - Standard Edition - Version 184.108.40.206 to 220.127.116.11 [Release 7.3.0 to 11.2]
Oracle Database - Personal Edition - Version 18.104.22.168 to 22.214.171.124 [Release 7.2.3 to 11.2]
Oracle Database - Enterprise Edition - Version 126.96.36.199 to 188.8.131.52 [Release 7.2.3 to 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Information in this document applies to any platform.
How to monitor and trace locking problems (enqueues).
This bulletin will assist you when:
1. Requiring to figure out if an instance has had locking problems with
enqueues. See section "Has locking been a problem".
2. Are there sessions just now in the instance that are waiting on
enqueues and who are the blockers. See "Is locking a problem just now".
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In this Document
|What are locks, enqueues and latches|
|Common types of enqueues|
|Has locking been a problem|
|Is locking a problem currently|