Database hangs while sessions waiting for 'gc freelist' (Doc ID 2073798.1)

Last updated on MAY 18, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 and later
Information in this document applies to any platform.

Symptoms

Frequently a database was getting hung. We noticed that many sessions were waiting for 'gc freelist', this wait event means that the sessions are waiting to get 'Lock Elements' (LE).

Also we may see DRM executing a pseudo-reconfiguration like:

note that the reason for the pseudo-reconfiguration was to free LE (Lock Elements).

Possibly _gc_element_percent was already set to 140, which increases the number of LEs created, but may not help to prevent the issue.

 

 

Cause

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