Log File Parallel Writes Take Longer with a Higher CPU Count
(Doc ID 1980199.1)
Last updated on OCTOBER 30, 2019
Applies to:
Oracle Database - Enterprise Edition - Version 11.1.0.7 and laterOracle 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
Information in this document applies to any platform.
Symptoms
- The higher the value for CPU_COUNT, the longer log file parallel writes take and hence the higher the waits for log file sync.
- In a test using the same workload on the same server, but with different settings for the cpu_count parameter, the following results were observed:
- Other tests using the same workload on the same server, but with different settings for the _log_parallelism_max and _log_simultaneous_copies, indicate that these also affect the log file parallel write times.
Cause
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In this Document
| Symptoms |
| Cause |
| Solution |
| References |