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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 AUGUST 04, 2018

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'.






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