OBIEE 11.1.1 - Database connection pool tuning

The maximum connection size needs to be set in the repository for each DB connection pool. Maximum connections parameter in each connection pool of the repository should be set to a very large value. It controls the number connections which can be made by BI server to the database.


Use OBIS performance counters in EM to determine if more or fewer DB connections are required.  For a simple sizing calculation, let’s assume there are peak N users concurrently downloading dashboard pages.  On average, each dashboard page executes L logical queries.  On average, each logical query executes P physical queries.  Then the number of DB connections required for this load would be N * L * P.  If fewer connections are specified, then response times will increase.


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