Database Experienced Very Slow Periods, Sessions Hang with Px Deq: Join Ack

(Doc ID 1251804.1)

Last updated on AUGUST 31, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 10.2.0.4 to 10.2.0.5 [Release 10.2]
Information in this document applies to any platform.

Symptoms

Database hang.
Sessions hang on "PX Deq: Join ACK" events are seen.
High 'library cache lock' waits in AWR report.

Cause

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