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

Last updated on MAY 22, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.1 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'.

       

Cause

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