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PGA Cache Hit Ratio

dbacoreFeb 28 2017 — edited Mar 1 2017

Hi,

In DWH DB ( 12c)  OEM reports PGA cache Hit Ratio 76% .

Values from Enterprise Manager ( 12c )

Current Allocated  :  20G  

Max allocated       :   116 G

pga_aggregate_target  :  100G

pga_aggregate_limit     :   200G

Server has 700 GB Memory.  Only about 60% is used at the moment.  Why Hit Ratio is so small if the limit is 200G and max allocated 116G ?

This post has been answered by Jonathan Lewis on Feb 28 2017
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Locked on Mar 28 2017
Added on Feb 28 2017
#general-database-discussions
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