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PGA size influence on Hash Joins

edited Aug 11, 2013 7:50PM in SQL Performance (MOSC) 7 commentsAnswered ✓
Hi Guys,This is my first post in the community. Recently I got into discussion with a fellow DBA about influence of large PGA on optimizer in favor of hash joins.

I think that  SGA and PGA should be set as large as possible. It is not going to influence NL joins/Hash Joins or Sort Merge Joins.  
Join method will be decided by result set rather than cache size. 

In a typical server with large RAM , almost 75-80% can be allocated to Oracle for OLTP system. 
We have few servers with 128 GB of RAM and almost 90-100 Gb is allocate to Oracle. 

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