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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.


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