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_$sqlarea and Remote DBA_users for use in
rem           sqlmem.sql and sqlsummary.sql reports
rem
rem
create or replace view sql_summary as
select
username, sharable_mem, persistent_mem, runtime_mem
from
sys.v_$sqlarea a, Remote DBA_users b
SEE CODE DEPOT FOR FULL SCRIPTS 

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.

SEE CODE DEPOT FOR FULL SCRIPTS

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