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Use automatic memory management with large page on AIX ?

edited Apr 25, 2019 4:20AM in SQL Performance (MOSC) 8 commentsAnswered

We have 2 data ware house type of databases, that also can be considered as an OLTP environment as Oracle 12.2.0.1 enterprise edition.    Each database is about 4-5 TB in size.  This is on IBM power 8 AIX system and configured to us LARGE PAGE.

The DB1 server memory 240GB

DB1 pga_aggregate_limit is 160GB

DB1 pga_aggregate_target is 80GB

DB1 sga_target is 110GB

The DB2 server memory 120GB

DB2 pga_aggregate_limit is 140GB

DB2 pga_aggregate_target is 70GB

DB2 sga_target is  50GB

At daily basis, some of the queries size could be very large taking high PGA.   But most time, PGA usage is not high.    maximum PGA allocated in v$PGASTAT is about 20GB on both DB.   PGA usage could be very dynamic.   We want to know if we could use Oracle automatic memory management (AMM) with large page configured.    Any conflict with each other?   Also, is it best practice to use AMM in our case?

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