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12102 to 19c - partition exchange - DLM cross inst call completion in RAC DBs

edited Sep 18, 2020 10:13AM in Database Administration (MOSC) 3 commentsAnswered

Hi,

We recently upgraded one of our 2 node RAC database from 12.1.0.2 to 19.6.0.0 (RHEL7.6)

Post the upgrade, our production support started to complain that the exchange partition steps are running slow.

We started observing "DLM cross inst call completion" events in the database when exchange partition sqls are run, such events werent observed in 12.1.0.2 database (we checked dba_hist_system_events & the dba_hist_sqlstats views to be sure).

Most of the time sql execution time were spent on the "DLM cross inst call completion" event.

We tried reproducing this issue in nonprod, we were able to observe this event only on 19c RAC system (which is what our case is).

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