Analyzing 'enq: HW - contention' Wait Event (Doc ID 740075.1)

Last updated on MARCH 10, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 9.2.0.1 and later
Information in this document applies to any platform.
***Checked for relevance on 29-Aug-2016***



Symptoms

1. There is a performance slow down with a large number of waits for 'enq HW - contention'.

2. ASH Reports shows the wait event 'enq HW - contention' which includes SQL with LOB Objects.

Cause

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