SQL Server 2014 Std Edition

We add columns all the time, and the ALTER TABLE commands return instantly.


alter table [dbo].[Account] add ChildAccount nvarchar(100) NULL

But at the moment, this alter table seems to run forever.

What would cause this?

  • 1
    Did you check for blocking ?
    – Kin Shah
    Sep 9, 2016 at 12:23

1 Answer 1


Yes, some other session was blocking. A few min later, this command executed instantly.

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