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Don Burleson Blog 







sga_target Tips

Oracle Database Tips by Donald BurlesonMarch 27, 2015

Question:  How do you estimate the appropriate value for the sga_target parameter?

Answer:  When using Automatic Memory Management (AMM), the Oracle 10g  sga_target parameter is obsolete, replaced by the Oracle 11g memory_target  parameter.

Oracle guru Mark D Powell shared this script to estimate the sga_target value, based on the existing pool usages in v$sga:

col EST_SGA_TARGET format 999,999,999,999

case when current_size = 0 then 'RESULT = V$SGA'
else 'ESTIMATE '
end as ESTvsSGA
) -

Using AMM via the sga_target and sga_max_size parameter changes how the traditional pool parameters work.

When using AMM, the values for the "traditional" pool parameters (db_cache_size, shared_pool_size, &c) are not ignored. Rather, they will specify the minimum size that Oracle will always maintain for each sub-area in the SGA.

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