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Parallel query hangs with 'PX Deq: Execute Reply' (Doc ID 1946632.1)

Last updated on MAY 19, 2022

Applies to:

Oracle Database Backup Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Cloud Service - Version N/A and later
Oracle Database - Enterprise Edition - Version 11.2.0.3 to 11.2.0.4 [Release 11.2]
Information in this document applies to any platform.

Symptoms

Dbms_stats.gather_table_stats is hanging and the wait event reported is "PX Deq: Execute Reply".

OR

Parallel query hangs, with each involved processes waiting on wait events
such as "PX Deq: Execute Reply", "PX Deq: Execution Msg",
"PX Deq: Table Q Sample", etc.

If SQL Trace of the related processes are taken, "err=12850" may appear
in a parallel slave process's trace file.

ORA-12850 "Could not allocate slaves on all specified instances"

 

Cause

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In this Document
Symptoms
Cause
Solution
References


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