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Re: Connections sitting idle...

From: Hiroshi Inoue <Inoue(at)tpf(dot)co(dot)jp>
To: Raymond O'Donnell <rod(at)iol(dot)ie>
Cc: pgsql-odbc(at)postgresql(dot)org
Subject: Re: Connections sitting idle...
Date: 2002-12-05 02:53:09
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-odbc
Raymond O'Donnell wrote:
> Hello all,
> I've been having a lot of trouble with connections sitting around
> idle for a long time after a query has executed. I'm building a web
> app which uses ADO on a windows computer to talk to the ODBC driver
> (version 7.02.0004, installed with pgAdmin II), which then talks to
> PostgreSQL on a Linux machine.
> I've been looking at the psqlodbc-xxxxx.log and basically, what is
> happening is that the query is executed as normal, then nothing
> happens for about 80 seconds (during which I can see the idle backend
> process on the linux server), and then suddenly the command
> "PGAPI_Disconnect" appears in the log and the backend finally
> terminates.
> I've tried this (i) calling the ADO objects from an ASP script (see
> [1] below) and (ii) calling the ADO objects from a COM DLL created in
> Delphi (pretty much the same as in the ASP script) to be called from
> an ASP script. In both cases, the backend hung around for about 80s,
> even though the connection has been explicitly closed and the
> connection object removed from memory. I've appended a typical set of
> log entries at [2] below.
> Interestingly, creating another Delphi app that talks to Postgres via
> either the Zeos components (which don't use either ADO or ODBC)
> causes the backed to die immediately once the connection is closed.
> This seems to imply to me that either ADO or the ODBC driver itself
> is for some reason keeping the connection open rather than closing it
> immediately.

Yes IIS uses the connection pooling mechanism by default.
Pooled connections would be re-used if possible for other
sessions without re-establishing new connections.

Anyway I can't see other sessions' info at all in your
example. How do other sessions behave ?

Hiroshi Inoue

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Subject: Re: [ODBC] Drop column and Access
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