Poor Performance with STATISTICS_LEVEL=ALL including Excessive Gettimeofday Calls on LINUX 64 or 32-bit
(Doc ID 436797.1)
Last updated on MAY 12, 2022
Applies to:
Oracle Database - Enterprise Edition - Version 10.2.0.3 to 10.2.0.5.0 [Release 10.2]Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Linux x86-64
Linux x86
Symptoms
You detect poor performance after rolling out a new OS and RDBMS
- The OS is LINUX 64 or 32-bit
- The problem appears on 10.2.0.x : the problem may not be version specific
You discover CPU Utiltization is saturated which is resulting in poor performance
The problem can be serious enough for users to be bumped off the database
Post investigation: You find CPU is for gettimeofday calls is taking most of the time
/
.
Changes
The new OS is LINUX 64-bit, however, this can occur in 32bit as well.
The new Oracle version is 10.2.0.x
STATISTICS_LEVEL=ALL ( default=TYPICAL)
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |