Template0 age is increasing speedily.

On Thu, 2006-09-07 at 16:01 +0530, Nimesh Satam wrote:

I noticed that the age of template0 is increasing very rapidly..Can
you please let me know how we can control this ....and what causes
such problems.

We also noticed that the database slow downs heavily at a particular
time..Can you suggest any tools which will help in diagnosing the root
cause behiond the data load.

Hi,

first of all: there is no need to cross post on 4 lists.
If you have a performance problem, post on pgsql-performance.

Second, please tell us which version of PostgreSQL on
which operating system you're using. Diagnosing your
problem might depend on which OS you use...

Finally, explain what you mean by "the age of template0 is
increasing very rapidly", you mean "the size is increasing"?

Bye,
Chris.

--

Chris Mair
http://www.1006.org

Hi,

Postgres Version used is 8.1.3
OS: Linux

'SELECT datname, age(datfrozenxid) FROM pg_database'

postgres | 1575
xyz | 1073743934
template1 | 1632
template0 | 61540256

This is the command which I tried and got the above output, and the number
is increasing pretty fast for template0.

Please let me know if this a problem.

Regards,
Nimesh.

In response to "Nimesh Satam" <nimesh.zedo@gmail.com>:

Hi,

Postgres Version used is 8.1.3
OS: Linux

'SELECT datname, age(datfrozenxid) FROM pg_database'

postgres | 1575
xyz | 1073743934
template1 | 1632
template0 | 61540256

This is the command which I tried and got the above output, and the number
is increasing pretty fast for template0.

Please let me know if this a problem.

Short answer: no, this is not a problem.

Long answer:
http://www.postgresql.org/docs/8.1/interactive/manage-ag-templatedbs.html

--
Bill Moran
Collaborative Fusion Inc.

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I would expect that the age of Template0 is increasing at the same rate as
every other database in your cluster. Transaction IDs are global across all
databases in the cluster, so as I understand it, executing a transaction in
any database will increase the age of all databases by 1.

-----Original Message-----
From: pgsql-performance-owner@postgresql.org
[mailto:pgsql-performance-owner@postgresql.org] On Behalf Of Nimesh Satam
Sent: Thursday, September 07, 2006 5:49 AM
To: Chris Mair
Cc: pgsql-performance@postgresql.org
Subject: Re: [PERFORM] [PATCHES] Template0 age is increasing speedily.

Hi,

Postgres Version used is 8.1.3
OS: Linux

'SELECT datname, age(datfrozenxid) FROM pg_database'

postgres | 1575
xyz | 1073743934
template1 | 1632
template0 | 61540256

This is the command which I tried and got the above output, and the number
is increasing pretty fast for template0.

Please let me know if this a problem.

Regards,
Nimesh.

On 9/7/06, Chris Mair <chrisnospam@1006.org> wrote:

On Thu, 2006-09-07 at 16:01 +0530, Nimesh Satam wrote:

I noticed that the age of template0 is increasing very rapidly..Can
you please let me know how we can control this ....and what causes
such problems.

We also noticed that the database slow downs heavily at a particular
time..Can you suggest any tools which will help in diagnosing the root
cause behiond the data load.

Hi,

first of all: there is no need to cross post on 4 lists.
If you have a performance problem, post on pgsql-performance.

Second, please tell us which version of PostgreSQL on
which operating system you're using. Diagnosing your
problem might depend on which OS you use...

Finally, explain what you mean by "the age of template0 is
increasing very rapidly", you mean "the size is increasing"?

Bye,
Chris.

--

Chris Mair
http://www.1006.org

On 9/7/06, Nimesh Satam <nimesh.zedo@gmail.com> wrote:

We also noticed that the database slow downs heavily at a particular
time..Can you suggest any tools which will help in diagnosing the root cause
behiond the data load.

possible checkpoint? poorly formulated query? it could be any number
of things. use standard tools to diagnose the problem, including:

unix tools: top, vmstat, etc
postgresql query logging, including min_statement_duration
explain analyze