Many Sessions Waiting for 'enq: KI - contention' Opening a PDB
(Doc ID 2604306.1)
Last updated on JUNE 22, 2020
Applies to:Oracle Database - Enterprise Edition - Version 126.96.36.199.0 to 188.8.131.52.0 [Release 18 to 19]
Information in this document applies to any platform.
Many sessions are waiting for 'enq: KI - contention'.
1) during concurrent PDB opening becomes longer as #of PDB's or # of instances increases.
2) when "alter system .. add datafile" or data file relevant command issued
The hanganalyze output will show the following or similar hangchain having the final blocker as idle DBWn:
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