On 12.2, Sessions are Waiting a Long Time with event "enq: UL - Contention" on ctxsys.drvdml.com_sync_index
(Doc ID 2481725.1)
Last updated on DECEMBER 06, 2018
Applies to:Oracle Text - Version 184.108.40.206 and later
Information in this document applies to any platform.
After upgrading the database to 220.127.116.11 or creating a new 12.2 database, there are lots of sessions waiting a long time with event "enq: UL - contention".
Below is the statement being waited on in those sessions:
begin ctxsys.drvdml.com_sync_index(:idxname, :idxmem, :partname); end;
This is evident from an AWR report taken during the time of contention:
The issue is happening for context indexes created with SYNC (ON COMMIT).
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