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Re: How to kill process "idle in transaction"

From: Achilleas Mantzios <achill(at)matrix(dot)gatewaynet(dot)com>
To: pgsql-admin(at)postgresql(dot)org
Cc: "Patrick De Zlio" <pchemla01(at)gmail(dot)com>
Subject: Re: How to kill process "idle in transaction"
Date: 2007-10-30 09:11:01
Message-ID: 200710301111.02475.achill@matrix.gatewaynet.com (view raw or flat)
Thread:
Lists: pgsql-admin
Στις Τρίτη 30 Οκτώβριος 2007 10:45, ο/η Patrick De Zlio έγραψε:
> Hi,
>
> We are running PostgreSQL 8.2.4 with quite highly updated millions rows
> tables.
>
> It comes sometimes to get some "idle in transaction" processes, which
> doesn't have first really viewable effect out of giving very bad estimated
> numbers for pgclass.reltuples and, if we let them run as it is, block the
> autovacuum from releasing rows, and after few days some worse problems.
>
> Now we are able to detect these "idle in transaction" processes, but what
> to do with them ?
>
> What to do to avoid such situation? How to find the bad request which put
> the process in this state? From the time it is idle in transaction, we
> can't see the query in the pg_lock table anymore.
>
> How to deal with such process when it is already idle in transaction? can
> we simply kill it? It is a backend from pgpool. Can we simply restart it
> (how) without restarting all the database?

Some connection pools issue a BEGIN on the connection just 
after the previous user of the connection issues COMMIT and 
then closes it (Jboss does it). So, <IDLE> in transaction is not 
apriori bad.

However if in your system you have lock problems, 
and transactions that dont get rollbacked or commited, 
then it is a problem with your application.

Have you done any monitoring on the size of the pool?
You should look at:
1) Connections get closed eventually
2) Transactions either have the autocommit flag on, are commited or are 
rollbacked.

>
> Thanks for help

-- 
Achilleas Mantzios

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