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Don Burleson Blog 







Oracle Shared Pool Advisory Utility

Oracle Tips by Burleson Consulting

Oracle Shared Pool Advisory Utility

Oracle9i release 2 included a new advice called v$shared_pool_advice , and there is talk of expanding the advice facility to all SGA RAM areas in future releases of Oracle.  It is also included in the standard AWR reports ($ORACLE_HOME/rdbms/admin/awrrpt.sql).

Starting in Oracle9i release 2, the v$shared_pool_advice  view shows the marginal difference in SQL parses as the shared pool changes in size from 10% of the current value to 200% of the current value.

The Oracle documentation contains a complete description for the set-up and use of shared pool advice, and it is very simple to configure.  Once it is installed, a simple script can be run to query the v$shared_pool_advice view and locate the marginal changes in SQL parses for different shared_pool  sizes. 



The following is a sample of the output:


                                         Est     Est
                                        Time   Parse
  Pool     Size      Est     Est LC    Saved   Saved          Est
Size(M)  Factor  LC(M)    Mem. Obj.    (sec)  Factor  Object Hits
------- ------- -------- ---------- -------- ------- ------------
     48      .5       48      20839  1459645       1  135,756,032
     64   .6667       63      28140  1459645       1  135,756,101
     80   .8333       78      35447  1459645       1  135,756,149
     96       1       93      43028  1459645       1  135,756,253
    112  1.1667      100      46755  1459646       1  135,756,842
    128  1.3333      100      46755  1459646       1  135,756,842
    144     1.5      100      46755  1459646       1  135,756,842
    160  1.6667      100      46755  1459646       1  135,756,842
    176  1.8333      100      46755  1459646       1  135,756,842
    192       2      100      46755  1459646       1  135,756,842

The statistics for the shared pool in this example fall in a wide range from 50% of the current size to 200% of the current size.  These statistics can give a great idea about the proper size for the shared_pool‑size.  If the SGA region sizes are selected automatically  with the alter system commands, creating this output and writing a program to interpret the results is a great way to ensure that the shared pool and library cache always have enough RAM.

The next section will provide information on the Program Global Area   (PGA ) RAM regions.



This is an excerpt from my latest book "Oracle Tuning: The Definitive Reference". 

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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