Database Tuning (MOSC)

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db_writer_process=1 better performance than when 25.

edited Jun 18, 2019 5:08AM in Database Tuning (MOSC) 3 commentsAnswered

Hi Experts,

I have multiple T7-2 servers running Solaris (version 11.3.35.5.6) with two zones, an Application zone and an Oracle 11.2.0.4 zone.

Performance 'waits' have been experienced through user experience and "test" utilities.

Currently, the CPU_COUNT for the all databases is 200.  The T7-2 has 512 CPUs.

Based on the Oracle documentation for db_writer_process, being 1 or CPU_COUNT/8, the parameter was set to 25.

Currently databases are experiencing "write complete waits" of up to 40 seconds.

             

06:30am 07/06/2019DB01DB02DB03DB04
DBWR_ParameterTotal_WaitsTime_WaitedAverage_WaitTotal_WaitsTime_WaitedAverage_WaitTotal_WaitsTime_WaitedAverage_Wait
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