Re: Deadlock occur while creating new table to be used in partition.

By the way, how I can diagnostic, what is

1) relation 46757
2) database 46753

Thanks and Regards
Yan Cheng CHEOK


--- On Mon, 4/26/10, Tom Lane <tgl@sss.pgh.pa.us> wrote:

> From: Tom Lane <tgl@sss.pgh.pa.us>
> Subject: Re: [GENERAL] Deadlock occur while creating new table to be used in partition.
> To: "Yan Cheng CHEOK" <yccheok@yahoo.com>
> Cc: pgsql-general@postgresql.org
> Date: Monday, April 26, 2010, 2:04 PM
> Yan Cheng CHEOK <yccheok@yahoo.com>
> writes:
> > Currently, I have a stored
> procedure(get_existing_or_create_lot), which will be called
> by 2 or more processes simultaneously.
> > Every process will have a unique lot name. What the
> store procedure does it
>
> > 1) Insert lot name into "lot" table. A unique lot id
> will be returned after insertion into "lot" table.
>
> > 2) Check if unit_{id} table does exist. For example,
> if the returned lot id is 14, PostgreSQL will check whether
> "unit_14" table does exist. If no, "CREATE TABLE unit_14..."
> will be executed.
>
> > Unfortunately, I get the run time error ;
> > 2010-04-26 13:28:28 MYTERROR:  deadlock
> detected   
>
> The reason for the error is probably that establishing the
> FK reference
> to table "lot" requires an exclusive lock on "lot", so each
> occurrence
> of this creation will serialize on that, in addition to
> anything else
> it might be locking.
>
> My opinion is that you're shooting yourself in the foot
> with a poorly
> chosen database layout.  Forget all the subtables and
> just have one
> big unit table.  It'll be far simpler and probably
> perform better too.
>
>            
> regards, tom lane
>
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