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Sizing the PGA

Posted on 2011-03-24
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Last Modified: 2012-05-11
What is the best way to determing the optiminal size of the pga_aggregrate_target?
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Question by:msimons4
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Expert Comment

by:sdstuber
ID: 35206975
let your system run with realistic loads for a while then check V$PGA_TARGET_ADVICE


"realistic" and "a while" are going to be determined by your database and application.
If you have fairly uniform load that occurs all the time you might need only a few hours to give the system enough time to gather useful information.

If you have peaks and valleys of usage and/or of different types of activities it will take longer.  There is no absolute number that will apply to all.
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sdstuber earned 2000 total points
ID: 35207031
you can also use information found in v$pga_target_advice_histogram to get a little more detailed view
but  I usually see the first view giving enough and the histograms simply support that info rather than provide different recommendation
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Author Comment

by:msimons4
ID: 35209233
Is there a way to plot the inverse of sort area and see where the inflection point is?
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LVL 74

Expert Comment

by:sdstuber
ID: 35209349
where are you seeing sort area trending?

I don't see a column by that name in either of the views above in my db.

Are you referring to sort_area_size  v$parameter?

If so,  that's a single value,  there is no curve inflection for one point.
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