From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Tatsuo Ishii <ishii(at)sraoss(dot)co(dot)jp> |
Cc: | tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com, david(at)fetter(dot)org, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Statement timeout behavior in extended queries |
Date: | 2017-04-05 01:08:41 |
Message-ID: | 20170405010841.dfggucoyqavqeto6@alap3.anarazel.de |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On 2017-04-05 10:05:19 +0900, Tatsuo Ishii wrote:
> > Hm. I started to edit it, but I'm halfway coming back to my previous
> > view that this isn't necessarily ready.
> >
> > If a client were to to prepare a large number of prepared statements
> > (i.e. a lot of parse messages), this'll only start the timeout once, at
> > the first statement sent. It's not an issue for libpq which sends a
> > sync message after each PQprepare, nor does it look to be an issue for
> > pgjdbc based on a quick look.
> >
> > Does anybody think there might be a driver out there that sends a bunch
> > of 'parse' messages, without syncs?
>
> What's your point of the question? What kind of problem do you expect
> if the timeout starts only once at the first parse meesage out of
> bunch of parse messages?
It's perfectly valid to send a lot of Parse messages without
interspersed Sync or Bind/Execute message. There'll be one timeout
covering all of those Parse messages, which can thus lead to a timeout,
even though nothing actually takes long individually.
Greetings,
Andres Freund
From | Date | Subject | |
---|---|---|---|
Next Message | Masahiko Sawada | 2017-04-05 01:17:44 | Re: ANALYZE command progress checker |
Previous Message | Andres Freund | 2017-04-05 01:05:25 | Outdated comments around HandleFunctionRequest |