||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.