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How to Check enq: FB - contention Format Block Enqueue for Insert statements (Doc ID 2277855.1)

Last updated on AUGUST 24, 2021

Applies to:

Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

- Top 5 Timed Foreground Events

- Multiple insert statements on same table which has partition 

- Segment by Read from AWR report shows top % on same insert iable segment ( * indicates Physical, Logical Reads etc)

- Query may use Parallel Executions

- Expected Fractured Blocks because of large object split block

 

Changes

 Recent Changes in Tablespace/Table Level Storage Parameters ( Initrans, Pctfree etc.) 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References

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