Home » RDBMS Server » Performance Tuning » Memory issue with PGA and AMM (merged) (12.1.0.2.0,Oracle Linux 7,x86_64)
Memory issue with PGA and AMM (merged) [message #643638] Wed, 14 October 2015 10:00 Go to next message
preet_kumar
Messages: 199
Registered: March 2007
Senior Member
Total Server memory is 64GB and i am using AMM with Memory_Target set to 32GB
The AMM automatically allocates SGA of 10GB and PGA_aggregate_target of 30GB.
I checked the total session PGA usage which is aggregating to 2Gb.

My quest is why the PGA_aggregate_target goges over the Memory_Target limit as it should be Memory_Target minus SGA.
Also when the session PG is only 2GB then where is the rest PGA_aggregate_target of 30GB being used any why do we have memory issues ?
Re: Memory issue with PGA and AMM [message #643639 is a reply to message #643638] Wed, 14 October 2015 10:11 Go to previous messageGo to next message
John Watson
Messages: 7262
Registered: January 2010
Location: Global Village
Senior Member
Please can you show the queries you are running that give you this information?
More PGA allocated than SGA [message #643778 is a reply to message #643638] Sun, 18 October 2015 02:21 Go to previous messageGo to next message
preet_kumar
Messages: 199
Registered: March 2007
Senior Member
Using the AMM with Memory_Target=128GB
The Enterprise Manager Memory Advisor graph shows 70% memory used for the PGA and only 30% for SGA.
Anyone knows the reason why it shows such a high amount of PGA aloocation whereas normally it should be 20% for PGA and rest for SGA ?
Re: More PGA allocated than SGA [message #643779 is a reply to message #643778] Sun, 18 October 2015 03:16 Go to previous message
Michel Cadot
Messages: 65387
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator

Not it should not be it depends on what you do.
And, as this is the same question than your previous topic, I'll merge both.
You know you MUST NOT do that but answer the questions that are posted to you.

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