Hallo Jeff,
I had similar experience . After upgrade from 12.2 single tenant to 19c
multitenant the SQLArea was much smaller for same shared pool size.
In AWR the difference between shared pool size in DBA_HIST_MEM_DYNAMIC_COMP
- sum( Shared Pool components) from DBA_HIST_SGASTAT increased after upgrade
for the DB with 400G sga_target from 6G to 35G. May be some internal memory
structures related to multitenant ? For 19c single tenant this difference was
almost same as under 12c
Best Regards
Petr
________________________________________
Von: oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> im Auftrag
von Beckstrom, Jeffrey <jbeckstrom@xxxxxxxxx>
Gesendet: Montag, 1. März 2021 14:01
An: oracle-l@xxxxxxxxxxxxx
Betreff: 4031 errors in 19.7
Since upgrading our Oracle EBS 12.1.3 IT Test system to 19.7 mutltenant from
11.2.0.4. We have been experiencing shared pool errors. After the last one, we
increased sga_target to 1 G larger than we had in 11g. However, we just
experienced another 4031 error. The IT database only has the EBS concurrent
managers running and very other light activity. The error occurred on Saturday
when only thing else running was stats. Does 19c multitenant require a much
larger sga_target?
Jeffrey Beckstrom
Greater Cleveland Regional Transit Authority
1240 W. 6th Street
Cleveland, Ohio 44113
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