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  Oracle Tips by Burleson

The Shared Pool and MTS

The use of the multithreaded server option (MTS) in Oracle requires a sometimes dramatic increase in the size of the shared pool. This increase in the size of the shared pool caused by MTS is due to the addition of the user global areas (UGAs) required for sorting and message queues. If you are using MTS, you should monitor the V$SGASTAT values for MTS-related memory areas, and adjust the shared-pool memory allocations accordingly.

Note that in Oracle 8 and greater, if MTS is being used, you should make use of the large pool feature to pull the user global areas and MTS queues out of the shared-pool area. This prevents the fragmentation problems that have been reported in shared pools when MTS is used without allocating the large pool.


This is an excerpt by Mike Ault’s book “Oracle9i Administration & Management” .  If you want more current Oracle tips by Mike Ault, check out his new book “Mike Ault’s Oracle Internals Monitoring & Tuning Scripts” or Ault’s Oracle Scripts Download.

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