Sessions Hang Due to Self Deadlock on TT Enqueue
(Doc ID 948668.1)
Last updated on OCTOBER 28, 2019
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.1 to 10.2.0.4 [Release 10.2]
Information in this document applies to any platform.
This problem can occur on any platform.
A session can hang waiting on TT enqueue while performing maintenance activities related to tablespaces/ objects on a tablespace.
Querying GV$LOCK shows that the holder of the TT enqueue is in self-deadlock on the same enqueue.
The self-deadlocked process was executing the below SQL issued from Enterprise Manager (EM).
BEGIN DBMS_SPACE.ISDATAFILEDROPPABLE_NAME(:1,:2); END;
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