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 and later
Information in this document applies to any platform.


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'.






Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms