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How to find the maximum number of concurrent users that can be connected to a database at any point of time ?.

Posted on 2007-03-29
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Hi all,

How to find the maximum number of concurrent users that can be connected to a database at any point of time ?.

1) Since, for dedicated servers, UGA is part of PGA and UGA is the only part of memory used by session logins, how to calculate what percentage of PGA could be allocated for UGA till PGA maxes out ?.

2) Also, in MTS servers, what part of Large Pool (or Shared Pool if Large Pool isn't configured) could be allocated for UGA ?.

3) Can Oracle allow concurrent connections till the value indicated by processes parameter ?.

Thanx

-RJ
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Question by:vrrajeeb
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Expert Comment

by:WPietruczuk
ID: 18821753
In the  initialization parameter file, you set the SESSIONS parameter to control this number of concurrent users. You should also consider changing your ENQUEUE_RESOURCES and TRANSACTION parameter values then.
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by:vrrajeeb
ID: 18826137
What if the UGA isn't sufficient enough to accommodate the number of sessions specified by the SESSIONS/PROCESSES parameter ?.
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Expert Comment

by:IanStuart
ID: 18897792
You don't really need to set the SESSION Parameter.
You just need to set the PROCESSES Parameter. Oracle sets the Sessions dynamically if not specified (Oracle does the following: Processes * 1.1 + 5)
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Author Comment

by:vrrajeeb
ID: 19686072
My question is specifically with reference to the UGA memory and the concurrent sessions that Oracle can allocate at any point of time. Sessions/processes parameters just mention the upper ceiling in sessions. ie., Oracle won't allow any more sessions than the limits specified by SESSIONS/PROCESSES parameters. But that doens't mean Oracle WILL or CAN allow those many concurrent sessions either. That depends on the memory dynamically available at any given point in time. How to find that out is my question.
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