Re: SET autocommit begins transaction?

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Sean Chittenden <sean(at)chittenden(dot)org>
Cc: Rod Taylor <rbt(at)rbt(dot)ca>, Thomas Lockhart <lockhart(at)fourpalms(dot)org>, pgsql-bugs(at)postgresql(dot)org
Subject: Re: SET autocommit begins transaction?
Date: 2002-09-19 00:44:36
Message-ID: 200209190044.g8J0iac18128@candle.pha.pa.us
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Sean Chittenden wrote:
> > > Of course, the reason they're rollbackable is:
> > >
> > > begin;
> > > create schema newschema;
> > > set search_path = newschema;
> > > rollback;
> > >
> > > create table junk; -- DOH!
> >
> > And:
> >
> > set statement_timeout = 20;
> > query_with_error;
> > set statement_timeout = 0;
> > COMMIT;
> >
> > That will have to change in autocommit off to:
> >
> > BEGIN;
> > SET statement_timeout = 20;
> > query_with_error;
> > SET statement_timeout = 0;
> > COMMIT;
> >
> > I assume that BEGIN does start a transaction. With no BEGIN above, the
> > big problem is that it will work most of the time, but when/if the query
> > fails, they will find out they forgot the BEGIN.
>
> Wouldn't it roll back to 0 though because the SET statement_timeout TO
> 20 was inside of a transaction (assuming the value was 0 before the
> transaction began)? -sc

Yes, with the BEGIN, it will roll back. With autocommit off, this:

> >
> > set statement_timeout = 20;
> > query_with_error;
> > set statement_timeout = 0;
> > COMMIT;

will not roll back to 0. It will be 20.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
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