Alter Table Add Column Command Hangs With Wait Event 'blocking txn id for DDL'
Last updated on JUNE 13, 2018
Applies to:Oracle Database - Enterprise Edition - Version 188.8.131.52 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'.
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