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New Shared Pool Features of Oracle 10gr2 (release 2)

Oracle Database Tips by Donald Burleson


Oracle has introduced some exciting load balancing features in 10g release 2, but there are also enhancements to the shared pool RAM structure in the SGA.

This whitepaper notes some enhancements to the shared pool in Oracle10g release 2.  There are two internal changes (extended chunk sizes and mutex) and enhancements to several of the v$ views:

Extended use of Standard Chunk sizes

In 10gR2, the server has been enhanced to further leverage standard chunk allocation sizes. This additional improvement reduces the number of problems arising from memory fragmentation.

Mutexes

To improve cursor execution and also hard parsing, a new memory serialization mechanism has been created in 10gR2. For certain shared-cursor related operations, mutexes are used as a replacement for library cache latches and librarycache pins. Using mutexes is faster, uses less CPU and also allows significantly improved concurrency over the existing latch mechanism. The use of mutexes for cursor pins can be enabled by setting the init.ora parameter _use_kks_mutex toTRUE.

V$SGASTAT

As mentioned earlier, V$SGASTAT has been enhanced to display a finer granularity of memory to component allocation within the shared pool. This allows faster diagnosis of memory usage (in prior releases many smaller allocations were grouped under the ?miscellaneous? heading).

V$SQLSTAT

A new view, V$SQLSTAT has been introduced which contains SQL related statistics (such as CPU time, elapsed time, sharable memory). This view is very cheap to query even on high-concurrency systems, as it does not require librarycache latch use. It contains the most frequently used SQL statistics in the V$SQL family of views.

V$OPEN_CURSOR

This implementation of this view has also been enhanced to be latchless, making it inexpensive to query.

V$SQLAREA

The V$SQLAREA view has been improved in 10gR2; the view optimizes the aggregation of the SQL statements while generating the view data.
 


 

If you like Oracle tuning, you may enjoy the new book "Oracle Tuning: The Definitive Reference", over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.


 

 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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