After Upgrade to 12c SecureFile LOB Writes are Slow With High Waits on 'db file sequential read'
(Doc ID 2189248.1)
Last updated on JANUARY 08, 2025
Applies to:
Oracle Database - Enterprise Edition - Version 12.1.0.2 and laterOracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud 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
Information in this document applies to any platform.
LOB writes slow, db file sequential read
Symptoms
- After upgrade to 12c SecureFile LOB writes are slow
- Top event in the AWR observed is db file sequential read' wait event during LOB writes and majority of the reads are UNOPTIMIZED reads based on segment statistics section
- Stack may look similar to the following:
Changes
Upgrade to 12c
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |