Re: DDL commands take forever

El mar, 29-12-2009 a las 15:44 -0500, Merlin Moncure escribió:
> right. IIRC the zeos library has a transaction mode that controls if
> commits are explicit or invoked via the library commit method. either
> way, you you need to make sure that transactions are not left
> open...this can lead (as you noticed) to unexpected problems like
> blocking queries, performance problems, data loss, etc.
>
> if you notice the slow ddl issue again, throw an immediate select *
> from pg_locks and look for granted = f. If you find some and they
> match your pid, then you know that you have a transaction open that is
> blocking you. From there, it's just a matter if using pg_locks and
> pg_stat_activity to narrow down who/what is doing it. You should
> especially take note of 'idle in transaction' in
> pg_stat_activity...this is classic red flag of leaky application code.
>
> merlin

I did the Select * from pg_locks right after your answer, and found that
almost all locks originated by my app have "granted = t", also, all are
in "<IDLE> in transaction". The interesting thing is the app is doing
only Selects, without opening transactions.

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Leonardo M. Ramé
Griensu S.A. - Medical IT Córdoba
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