Database Tuning (MOSC)

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ASMM Parameter Size Determination

in Database Tuning (MOSC) 7 commentsAnswered

Hello

The following are my platform and database specs.

Linux v9.6 RHEL x86-64

Oracle Enterprise Database 19.30.0.0.0

Non container database instance.

Currently, we have AMM configured. Upon startup of a database instance, we receive the following error.

WARNING: Automatic Memory Management is not recommended for this SGA size. Our current SGA size is 8 GB.

The recommended change from Oracle is to disable AMM and enable ASMM.

For SGA_PARGET and SGA_MAX_SIZE parameter values, the Oracle Administrator's guide recommends looking at the V$SGA_TARGET_ADVICE table and looking for a significant dropoff in the ESTD_PHYSICAL_READS to determine if the current SGA_TARGET size is optimal. I am not sure how to determine that information as far as determining what a dropoff is.

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