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.