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Different Values Found For MEMORY_MAX_TARGET/SGA_MAX_SIZE Between Spfile and V$PARAMETER/Show Parameter (Doc ID 1958859.1)

Last updated on NOVEMBER 11, 2020

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.


Different values are found for parameters MEMORY_MAX_TARGET and SGA_MAX_SIZE between spfile and v$parameter/show parameter. Those 2 parameters are set explicitly to 0 in spfile, but after database startup, "show parameter" always shows a non-zero value for both parameters, although they are all marked with "not default/not modified/not adjusted" in v$parameter.
The behaviour can be easily reproduced as below:


1. Explicitly set following parameters

4. Repeat with step 1, but change the SGA_MAX_SIZE / MEMORY_MAX_TARGET to values which is smaller than the value from V$PARAMETER in the previous step (let's say, set SGA_MAX_SIZE to 100M and set MEMORY_MAX_TARGER=200M). After recycling the instance, those 2 parameters are also being overridden with the value which is the same as we get from the previous test.


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