Database Hangs with parallel_degree_policy = AUTO; Serial statement holding JX Enqueue
(Doc ID 1333867.1)
Last updated on FEBRUARY 28, 2019
Applies to: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.
Intermittently, the PX statement queue becomes hung when parallel_degree_policy = AUTO. Neither the parallel_target_servers, nor the parallel_max_servers values has been reached, yet statements no longer come out of the PX statement queue.
When the PX queue becomes hung, it can be seen by this query from v$sql_monitor:
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