Table identifies the parameters that affect the performance of Oracle OLAP. Alter your server parameter file or init.ora file to these values, then restart your database instance. You can monitor the effectiveness of these settings and adjust them as necessary.
Initial Settings for Database Parameter Files
Procedure: Setting System Parameters for OLAP
Take the following steps to set system parameters:
About the OLAP_PAGE_POOL_SIZE Setting
OLAP_PAGE_POOL_SIZE is an initialization parameter that is specific to Oracle OLAP. This parameter specifies in bytes the maximum size of the paging cache to be allocated to each OLAP session. The minimum value of OLAP_PAGE_POOL_SIZE is 2 MB. The default value is 32 MB.
These are the basic guidelines for setting OLAP_PAGE_POOL_SIZE:
The OLAP page pool is allocated at the start of an OLAP session and released when the user closes the session. An OLAP session can be initiated by the OLAP_TABLE function, the DBMS_AWM PL/SQL package, or using the command line in OLAP Worksheet.
The OLAP page pool is allocated from the User Global Area (UGA). When the database is running in dedicated mode, the UGA is part of the Process Global Area (PGA). When the database is running as a shared server process, the UGA is part of the Shared Global Area (SGA).
When the OLAP page pool is full, it uses the DB cache as a swap space. This in-memory swapping is a relatively fast operation. When the DB cache is full, it swaps to disk, which is a relatively slow operation. If the DB cache must swap to disk frequently, then performance will suffer significantly.
About the PGA_AGGREGATE_TARGET Setting
PGA_AGGREGATE_TARGET is used by SQL statements, particularly when performing SELECT statements with GROUP BY and ORDER BY clauses. It is not used by the OLAP engine. However, PGA_AGGREGATE_TARGET can affect the performance of the BI Beans when selecting data from relational tables. If your Oracle Database supports this type of application, set GA_AGGREGATE_TARGET initially to 200-400MB, and use the database performance monitoring tools to recommend adjustments.
OLAP Related Interview Questions
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OLAP Related Practice Tests
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