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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 first report we will examine shows how individual users are utilizing the shared pool. Before we can run the report a summary view of the V$SQLAREA view must be created, I unimaginatively call this view the SQL_SUMMARY view. The code for the SQL_SUMMARY view is shown in Figure 4.

rem FUNCTION: Creates summary of v_$sqlarea and Remote DBA_users for use in
rem           sqlmem.sql and sqlsummary.sql reports
create or replace view sql_summary as
username, sharable_mem, persistent_mem, runtime_mem
sys.v_$sqlarea a, Remote DBA_users b

Figure 4: Example SQL Script to Create A View to Monitor Pool Usage By User

Once the SQL_SUMMARY view is created the script in Figure 5 is run to generate a summary report of SQL areas used by user. This shows the distribution of SQL areas and may show you that some users are hogging a disproportionate amount of the shared pool area. Usually, a user that is hogging a large volume of the shared pool is not using good SQL coding techniques which is generating a large number of non-reusable SQL areas.


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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