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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

Date: 11/18/98                                                   Page:   1     
Time: 04:18 PM              Users SQL Area Memory Use            SYSTEM        
                                 ORTEST1 database                               
                      Shared   Persistent      Runtime      Used          Mem  
User                   Bytes        Bytes        Bytes     Areas          Sum  
--------------- ------------ ------------ ------------ --------- ------------  
GRAPHICS_Remote DBA          67,226        4,640       30,512        10      102,378  
SYS                  830,929       47,244      153,652        80    1,031,825  
SYSTEM             2,364,314       37,848      526,228        63    2,928,390  
                ------------ ------------ ------------ --------- ------------  
sum                3,262,469       89,732      710,392       153    4,062,593  
3 rows selected.

Figure 6: Example Output From Figure 5

In the example output we see that SYSTEM user holds the most SQL areas and our application Remote DBA user, GRAPHICS_Remote DBA holds the least. Since these reports where run on my small Oracle 8.0.5 database this is normal, however, usually the application owner will hold the largest section of memory in a well designed system, followed by ad-hoc users using properly designed SQL. In a situation where users aren't using properly designed SQL statements the ad-hoc users will usually have the largest number of SQL areas and show the most memory usage. Again, the script in Figure 7 shows the actual in memory SQL areas for a specific user. Figure 8 shows the example output from a report run against GRAPHICS_USER using the script in Figure 7.


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