Re: Limiting User Resources

You could hack the guc.c file in 7.3 to make the timeout setting (which
is per statement) to be unsettable by users and set it in
postgresql.conf; interesting idea.

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Alvaro Herrera wrote:
> C F dijo:
>
> > Hello,
>
> > Does PostgreSQL have anything similar? I'd be perfectly happy with
> > simply being able set a timeout on SQL queries (where after a certain
> > amount of time the query is cancelled and the resources it was using
> > are freed).... I'd like to know what options there are. If not
> > natively available in the the database are there 3rd party products or
> > techniques you can suggest? Basically I'm looking at allowing users
> > to enter their own queries through a web interface and I'm worried
> > about people writing bad queries and hogging up the resources and
> > effectively shutting down the site!
>
> In the current development version there is a mechanism to set up
> timeouts for queries (or was that transactions? I don't remember). Note
> however that the user has the ability to change it, so you can't really
> control malicious users this way.
>
> If your users are going to have full freedom to do whatever they want,
> there's no way you can control them. If however you are going to put
> some restrictions (say add a begin/end transaction markers, disallow
> using semicolons and single quotes in queries, etc) you can use the
> timeout.
>
>
> It would be nice if there was a way to limit the resources used, for
> universities and such.
>
> --
> Alvaro Herrera (<alvherre[a]atentus.com>)
> "Now I have my system running, not a byte was off the shelf;
> It rarely breaks and when it does I fix the code myself.
> It's stable, clean and elegant, and lightning fast as well,
> And it doesn't cost a nickel, so Bill Gates can go to hell."
>
>
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