Re: What is the quickest query in the database?

That question sounds like one more of design or
architecture.  Timing out the connection is one
solution.  Another immediate idea comes to mind where
you can use a seperate thread or fork another process
allowing the rest of the application to continue if
needed.

Thanks.

--- Ericson Smith <eric@did-it.com> wrote:
> But, unless there is a timeout on that query, wont
> the system being down
> really hang you up, until your script reaches it's
> default timeout?
>
> We had this problem with PHP and Perl in the past.
> Is there a way to get
> around this in Java?
>
> - Ericson Smith
> eric@did-it.com
>
> On Thu, 2003-02-20 at 15:32, P G wrote:
> > You are correct Steve Crawford.  The query is used
> to
> > remotely test the connection to the db using JDBC.
>  I
> > think, though, Jan Wieck provides the most
> valuable
> > solution so far.  Any more thoughts, anyone?
> >
> > TIA.
> >
> > --- Steve Crawford
> <scrawford@pinpointresearch.com>
> > wrote:
> > > It's academic. Set timing on in psql and run a
> bunch
> > > of tests. The variation
> > > from test to test is large enough to mask any
> > > difference between select 0 or
> > > select '' or select null.
> > >
> > > It would, however, be nice to know the reason
> for
> > > this query. I suspect it is
> > > to "ping" the server and making sure it is up by
> > > connecting and running a
> > > simple query with a known result. (Many colos
> have
> > > all sorts of setups for
> > > monitoring web servers but fewer for other
> services
> > > - setting up a "test"
> > > page on the web server that makes a request from
> the
> > > app server which, in
> > > turn, does a simple db query, all of which
> > > ultimately returns a standard
> > > string, say "system up", to the http request
> works
> > > quite well to set off
> > > alarm bells at the colo or even to allow a load
> > > balancer to take action).
> > >
> > > But I am surmising. What is the real reason for
> the
> > > query?
> > >
> > > Cheers,
> > > Steve
> > >
> > >
> > > On Thursday 20 February 2003 11:52 am, Jonathan
> > > Bartlett wrote:
> > > > Might select NULL; be faster, since the number
> > > doesn't have to be parsed,
> > > > and null is probably a keyword?
> > > >
> > > > Jon
> > > >
> > > > On Thu, 20 Feb 2003, Tino Wildenhain wrote:
> > > > > Hi P G,
> > > > >
> > > > > On Thu, 20 Feb 2003 09:52:07 -0800 (PST)
> > > > >
> > > > > P G <pg_dba@yahoo.com> wrote:
> > > > > > What is the quickest and least intrusive
> query
> > > in the
> > > > > > database that will always succeed?
> > > > >
> > > > > select 1;
> > > > >
> > > > > :o)
> > > > >
> > > > > Regards
> > > > > Tino
> > > > >
> > > > > > select current_user;
> > > > > >
> > > > > > -- OR --
> > > > > >
> > > > > > select datname from pg_database where
> datname
> > > =
> > > > > > 'some_database';
> > > > > >
> > > > > > Or would it be something else?
> > > > > >
> > > > > > TIA.
> > > > > >
> > > > > >
> > >
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> --
> Ericson Smith <eric@did-it.com>
>


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