Обсуждение: [IDLE in TRANSACTION] when I do TOP -c

O Fabrice.Sznajderman@devoteam.com έγραψε στις Jan 5, 2006 :

> Hello,
>
>
> I look the processes on my server where was installed Postgres Database.
> I can saw, when I do top command, many process named : idle in
> transaction.
>
> What happend with this process? what is the cause of this message?

Maybe its some connection pool that causes this.
Have you installed and running jboss?? I know 3.x is behaving like that.
Generally its not a bad thing to worry about.

>
> Thanks in advance for your help,
>
> Fabrice
>
>
> +---------------------------------------------------------------------+
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>
> Devoteam is an IT consulting group.
> Combining consulting and technology solutions offers enables
> Devoteam to provide its customers with independent advice and
> effective solutions to align their information system's technical
> infrastructure with their operational objectives.
> The group achieved a turnover of 150 million euros in 2004
> an operating margin of 5.8% and counts 1,800 employees through
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> IT CAC, IT CAC 50, SBF 250 index of Euronext Paris.
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--
-Achilleus

O Fabrice.Sznajderman@devoteam.com έγραψε στις Jan 5, 2006 :

> Thanks for  your help!
>
>  I using WebSphere Portal Server to acces postgres database.

May its the Websphere.

Shutdown Websphere, and then do:
psql,
begin;

then from another window do top.
You see an idle in transaction again right?


>
> the Postgres Database is fill up by Redhat CCM - CMS.
>
> So you think this message is not important for the database Performance?
>
> Fabrice SZNAJDERMAN
>
> DSI : Application Rendez-Vous - CCM
> tel : 01 41 49 60 77
>
>
>
> Achilleus Mantzios <achill@matrix.gatewaynet.com>
> EnvoyΓ© par : pgsql-jdbc-owner@postgresql.org
> 05/01/2006 17:15
>
> A
> Fabrice.Sznajderman@devoteam.com
> cc
> pgsql-jdbc@postgresql.org
> Objet
> Re: [JDBC] [IDLE in TRANSACTION] when I do TOP -c
>
>
>
>
>
>
> O Fabrice.Sznajderman@devoteam.com έγραψΡ στις Jan 5, 2006 :
>
> > Hello,
> >
> >
> > I look the processes on my server where was installed Postgres Database.
> > I can saw, when I do top command, many process named : idle in
> > transaction.
> >
> > What happend with this process? what is the cause of this message?
>
> Maybe its some connection pool that causes this.
> Have you installed and running jboss?? I know 3.x is behaving like that.
> Generally its not a bad thing to worry about.
>
> >
> > Thanks in advance for your help,
> >
> > Fabrice
> >
> >
> > +---------------------------------------------------------------------+
> > About Devoteam:
> >
> > Devoteam is an IT consulting group.
> > Combining consulting and technology solutions offers enables
> > Devoteam to provide its customers with independent advice and
> > effective solutions to align their information system's technical
> > infrastructure with their operational objectives.
> > The group achieved a turnover of 150 million euros in 2004
> > an operating margin of 5.8% and counts 1,800 employees through
> > ten European countries and the Middle East.
> > Listed on the Euronext Paris Nouveau Marche and part of the Nexteconomy,
> > IT CAC, IT CAC 50, SBF 250 index of Euronext Paris.
> > www.devoteam.com
> > +---------------------------------------------------------------------+
> >
>
>

--
-Achilleus

Fabrice.Sznajderman@devoteam.com wrote:

> I look the processes on my server where was installed Postgres Database.
> I can saw, when I do top command, many process named : idle in transaction.
>
> What happend with this process? what is the cause of this message?

Each process corresponds to a single client connection to the database.

"idle in transaction" means that connection has a transaction open but
is not currently doing any work. If I had to guess at the cause of this
I'd say that you are using a connection pool and a 7.4 driver.

The JDBC driver would cause these idle transactions itself (mostly
harmlessly) in 7.4 and earlier releases when autocommit was off: a
commit or rollback would automatically start a new transaction even
before any queries had been run.

With 8.0 and later drivers a new transaction is only started when the
first query after a commit or rollback is done, so if you are using
these drivers it probably indicates an application bug where it is not
correctly closing transactions it begins.

-O