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How to do sizing for num_estore_segs and ESTORE_SEG_SZ to use extended memory

Posted on 2004-04-03
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Last Modified: 2008-01-09
I am using DB2 7.2.3 Enterprise in Windows NT 4.0 Enterprise edition. How to do sizing for  num_estore_segs and ESTORE_SEG_SZ to use Extended menory ?

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Question by:prabha_kar_d
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by:BigSchmuh
ID: 10796493
Choose the bufferpool which is the most used and allow only this one to use extended memory segments, then define those segments to have the same size and to consume your Available Physical Memory.

You can although use the /3GB boot.ini switch to allow your DB2 process to have 3Go addressable memory space instead of 2Go. I think the easiest way if your server have less than 4Gb RAM.

Hope this helps.
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by:prabha_kar_d
ID: 10803121
Thanks for your reply Bigschmuh. I have configured few bufferpools to use extended memory. By setting  num_estore_segs and ESTORE_SEG_SZ parameters, is it use only physical memory ? How to configure to use virutal memory ?

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BigSchmuh earned 100 total points
ID: 10807602
You can not choose between virtual and real memory...
The DB2 process will use a maximum of 2Gb virtual memory (or 3Gb with the /3GB switch) which can be mapped to MORE real memory using the Windows AWE (starting with W2K Advanced server using /PAE switch) or DB2 extended memory segments (Less efficient because more pagination occurs but works on every platform).

Hope this helps.
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