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Library Cache Lock With USER$ SQL Causing Waits (Doc ID 2879196.1)

Last updated on JULY 20, 2024

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

Seeing a performance issue on the database with a lot of library cache lock.

They are all waiting on this query:

update user$ set exptime=DECODE(to_char(:2, 'YYYY-MM-DD'), '0000-00-00', to_date(NULL), :2),ltime=DECODE(to_char(:3, 'YYYY-MM-DD'), '0000-00-00', to_date(NULL), :3)
,astatus = :4, lcount = :5 where user#=:1

Cause

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In this Document
Symptoms
Cause
Solution
References


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