Обсуждение: pl/pgsql and Transaction Isolation

Hello,

  I have an instance where I have a series of pl/pgsql calls, that report stat
results to a common table.  When other queries try to hit the stat table
(with DML commands; SELECT, INSERT, UPDATE, DELETE etc.) they are forced to
wait in a queue until the pl/pgsql has finished executing.

will:

 SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;

before these DML queries eliminate the locking?


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marcus whitney

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Marcus Whitney <marcus@coldfeetcreative.com> writes:
>   I have an instance where I have a series of pl/pgsql calls, that report stat
> results to a common table.  When other queries try to hit the stat table
> (with DML commands; SELECT, INSERT, UPDATE, DELETE etc.) they are forced to
> wait in a queue until the pl/pgsql has finished executing.

This is quite hard to believe, unless your pl/pgsql is doing something
as unfriendly as LOCKing the table.

Do you want to post a more complete description of your problem?

            regards, tom lane

You were right not to believe it.  I had an update on a whole table that I
hadn't noticed.  Thanks for debunking.

On Monday 07 June 2004 23:29, you wrote:
> Marcus Whitney <marcus@coldfeetcreative.com> writes:
> >   I have an instance where I have a series of pl/pgsql calls, that report
> > stat results to a common table.  When other queries try to hit the stat
> > table (with DML commands; SELECT, INSERT, UPDATE, DELETE etc.) they are
> > forced to wait in a queue until the pl/pgsql has finished executing.
>
> This is quite hard to believe, unless your pl/pgsql is doing something
> as unfriendly as LOCKing the table.
>
> Do you want to post a more complete description of your problem?
>
>             regards, tom lane
>
> ---------------------------(end of broadcast)---------------------------
> TIP 1: subscribe and unsubscribe commands go to majordomo@postgresql.org

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marcus whitney