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 126.96.36.199 to 188.8.131.52 [Release 11.2]
Information in this document applies to any platform.
Dbms_stats.gather_table_stats is hanging and the wait event reported is "PX Deq: Execute Reply".
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"
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