Re: ALTER TABLE ADD COLUMN takes forever

Laurenz,

You're a saviour.
Thanks a bunch.

This thread can be closed

Regards,
Devendra Yadav

On Tue, 30 Mar 2021, 16:42 Laurenz Albe, <laurenz(dot)albe(at)cybertec(dot)at> wrote:

> On Mon, 2021-03-29 at 22:48 +0530, Devendra Yadav wrote:
> > > I am running a query on a table - ALTER TABLE mytable ADD COLUMN
> deposited DOUBLE PRECISION DEFAULT 0.0;
> > > >
> > > > this query just runs forever.
> > >
> > > Then either you are using a PostgreSQL version older than v11, or there
> > > is an open transaction that used the table and blocks you.
> >
> > We are using PostgreSQL v12.1
> > There are no open transactions as the table is not blocked by any pid.
> However when i check pg_locks it say granted=false
> > but nothing blocking it. Bit strange!!
>
> As I replied in the other thread you started, you are probably blocked
> by a prepared transaction.
>
> Yours,
> Laurenz Albe
> --
> Cybertec | https://www.cybertec-postgresql.com
>
>