| PGA content [message #325325] |
Thu, 05 June 2008 14:43  |
shrinika
Messages: 306
Registered: April 2008
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Senior Member |
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Dear All,
I have one clarification in PGA memory.
Here is the oracle version i am using
Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
PL/SQL Release 9.2.0.1.0 - Production
CORE 9.2.0.1.0 Production
TNS for 32-bit Windows: Version 9.2.0.1.0 - Production
NLSRTL Version 9.2.0.1.0 - Production
My understanding here is, The PGA consist of below.
1. user’s session variables and arrays,
2. session addresses,
3. stack space information
4. UGA(if the server is running on Dedicated server. If the server is running in MTS, then UGA will be part of SGA(large pool))
My question here is, where would fit the below memory area? Are these part of PGA??
SORT_AREA_SIZE
HASH_AREA_SIZE
BITMAP_MERGE_AREA_SIZE
CREATE_BITMAP_AREA_SIZE
I do underand that, these above *AREA_SIZE parameters are automatically tuned for dedicated server by using couple of init paramters(PGA_AGGREGATE_TARGET, WOKR_AREA_SIZE_POLICY). But in MTS, these paramters needs to be specified in parameter file.
I would appreciate if you any one could clarify my question. Thanks
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| Re: PGA content [message #325595 is a reply to message #325501] |
Fri, 06 June 2008 11:20  |
shrinika
Messages: 306
Registered: April 2008
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Senior Member |
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Michel, One clarification in sort_area_retained_size.
In MTS, When we allocate SORT_AREA_RETAINED_SIZE, it is part PGA. When sort completes, it release the SORT_AREA_RETAINED_SIZE to UGA. It means that, the sort_area_retained_size will be part of SGA after the sort is completed(before the final sort). Since UGA is part of SGA in MTS.
Am i correct on the above part??
Thanks
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