Parallel Query hangs due to "PX Deq: Join ACK" on RAC (Doc ID 2223443.1)

Last updated on JANUARY 18, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.4 to 11.2.0.4 [Release 11.2]
Oracle Database - Enterprise Edition - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]
Microsoft Windows x64 (64-bit)

Symptoms

Parallel Query may not complete, and Query Cordinator(QC) process waits for "PX Deq: Join ACK" when following all conditions are met.

And following messages appear in event log of MsLbfoProvider when this problem happens.

WARNING 2017/1/1 00:00 Microsoft-Windows-MsLbfoEventProvider 8
NONE Failing NBL send on TeamNic 0xffffe0014dbd6010

 

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms