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PGA_AGGREGATE_TARGET is the user workspace for Oracle users. By querying V$PGA_TARGET_ADVICE you can see what Oracle recommends on how to size your PGA_AGGREGATE_TARGET value. To query this view use the following query.

SELECT round (PGA_TARGET_FOR_ESTIMATE/1024/1024) target_mb, ESTD_PGA_CACHE_HIT_PERCENTAGE cache_hit_perc, ESTD_OVERALLOC_COUNT FROM v$pga_target_advice;

The output of this query will be similar to the following:
---------- -------------- --------------------
24            15                     143
48            32                     28
95            42                     4
143           63                     0

From the above results we should set the PGA_AGGREGATE_TARGET parameter to a value where we avoid any over allocation, so lowest PGA_AGGREGATE_TARGET value we can set is 143 (where ESTD_OVERALLOC_COUNT is 0).


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