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Why STATISTICS_LEVEL initialization parameter must be set to TYPICAL (the default)?

Updated May 19, 2018

Hello Experts,

According to oracle docs The STATISTICS_LEVEL initialization parameter must be set to TYPICAL (the default) or ALL for automatic shared memory management to function. Why?

Please provide some reason.

Thanks in advance.

Comments

10 Feb 2016 5:02 pm Abhijeet Mudgal Helpful Answer

If you set it to basic, oracle will not gather stats reqired for "shared memory management to function"
Here are setting the STATISTICS_LEVEL parameter to BASIC disables the collection of many of the important statistics required by Oracle Database features and functionality, including:
Automatic Workload Repository (AWR) Snapshots
Automatic Database Diagnostic Monitor (ADDM)
All server-generated alerts
Automatic SGA Memory Management
Automatic optimizer statistics collection
Object level statistics
End to End Application Tracing (V$CLIENT_STATS)
Database time distribution statistics (V$SESS_TIME_MODEL and V$SYS_TIME_MODEL)
Service level statistics
Buffer cache advisory
MTTR advisory
Shared pool sizing advisory
Segment level statistics
PGA Target advisory
Timed statistics
Monitoring of statistics

10 Feb 2016 5:02 pm Jyoti Pandey Helpful Answer

ASMM uses SGA memory broker that is implemented by 2 background process. MMON and MMAN .MMON collects statistics and memory advisory data in memory and MMAN uses this information to coordinates the sizing of memory components.So setting the statistics_level to basic will not generate statistics which will be decesion making for MMAN to coordinates the sizes of different component.