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Diving Into the Shared Pool - An In Depth Look at Tuning the Shared Pool (Part 1)

Oracle Tips by Mike Ault

Monitoring and Tuning the Shared Pool

The report script in Figure 10 shows at a glance (well, maybe a long glance for a system with hundreds of users) which users aren't making good use of reusable SQL. An example report output is shown in Figure 11.

Date: 11/18/98                                                   Page:   1
Time: 04:16 PM            Shared Pool Utilization           SYSTEM        
                              ORTEST1 databas                             
                                                                          
USERS                          Non-Shared SQL     Shared SQL Percent Shared
------------------------------ -------------- -------------- --------------
GRAPHICS_Remote DBA                           27,117         38,207          58.49
SYS                                   302,997        575,176          65.50
SYSTEM                              1,504,740        635,861          29.70
                               -------------- -------------- --------------
avg                                                                   51.23
sum                                 1,834,854      1,249,244              

Figure 11: Example Report From Showing SQL Reuse Statistics

Notice in Figure 11 that the GRAPHICS_Remote DBA user only shows 58.49% shared SQL use based on memory footprints. From the report in Figure 8 we would expect a low reuse value for GRAPHICS_Remote DBA. The low reuse value for the SYSTEM user is due to its use as a monitoring user, the monitoring SQL is designed to be used once per day or so and was not built with reuse in mind.

SEE CODE DEPOT FOR FULL SCRIPTS


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

You can buy it directly from the publisher and save 30%, and get instant access to the code depot of Oracle tuning scripts.


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