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Alter Table Add Column Command Hangs With Wait Event 'blocking txn id for DDL' (Doc ID 1553725.1)

Last updated on FEBRUARY 24, 2019

Applies to:

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

Symptoms

1. In 11.2, alter table add column hangs with wait event 'blocking txn id for DDL'.
2  AWR shows one of the top waits as 'blocking txn id for DDL'.

       
       

3. Also 10046 shows most of the wait time is on 'blocking txn id for DDL'.

 

 

Changes

 None

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References

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