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Re: Number of connections

From: "Roberts, Jon" <Jon(dot)Roberts(at)asurion(dot)com>
To: pgadmin-hackers <pgadmin-hackers(at)postgresql(dot)org>
Subject: Re: Number of connections
Date: 2007-12-10 15:25:25
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgadmin-hackers

> -----Original Message-----
> From: Heikki Linnakangas [mailto:hlinnaka(at)gmail(dot)com] On Behalf Of Heikki
> Linnakangas
> Sent: Monday, December 10, 2007 9:12 AM
> To: Roberts, Jon
> Cc: pgadmin-hackers
> Subject: Re: [pgadmin-hackers] Number of connections
> Roberts, Jon wrote:
> > I've noticed that when using pgAdmin, each user will have multiple
> > connections to the database.  We actually observe three connections for
> each
> > user which seem to be:
> > 1.  pgAdmin UI
> > 2.  Maintenance database
> > 3.  Query Window
> >
> > Then for each Query Window, there is another connection created.  So if
> a
> > user wants to execute two concurrent queries, they actually have four
> > database connections open.
> >
> > Wouldn't it be better to create a connection pool and only increment
> beyond
> > one connection to the database when there are true concurrent requests?
> I
> > believe this is how M$ SQL Server handles this.
> >
> > Alternatively, limiting the client to only one connection would be OK
> too
> > and be less work than implementing a connection pool.  Maybe this could
> be a
> > configuration setting. (Multi-thread yes/no).
> Would be problematic at least for the Query Windows, because the SQL
> script might set session-variables, create temp tables etc.

It took me a minute, but I think I see what you mean now.  It would have to
be a modified connection pool like M$.  When you execute a query, it creates
a new connection to the database only if the existing connection isn't busy.
When this happens, the connection is stuck to this query window.  Sort of
like a sticky session in a web browser.

I would think far less code would be needed if the tool could be configured
to only use one connection.  



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Subject: Re: Number of connections
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