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IOTFRSPEED Defaults To 4096 While Gathering NOWORKLOAD System Stats (Doc ID 2381946.1)

Last updated on MARCH 03, 2022

Applies to:

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 Backup Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

Executing dbms_stats.gather_system_stats('NOWORKLOAD') returns in about 85% of cases tested
default values for IOSEEKTIME (i.e. default 10.0 millisec) and IOTFRSPEED (i.e. default 4096 bytes / millisec)
while the underlying storage might be a lot faster

Changes

Executing dbms_stats.gather_system_stats('NOWORKLOAD') might unexpectedly reset a good value of IOTFRSPEED and IOSEEKTIME
to default values.

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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