Re: WARNING: pgstat wait timeout

Hi Dinesh,

Thanks for that - it's when it's vacuuming a DB on Amazon EC2 so I think
case 1 is probably the culprit.

Jake

On 5 February 2013 00:54, dinesh kumar <dineshkumar02(at)gmail(dot)com> wrote:

> Hi,
>
> As of now, i found the following cases where we can expect these kind of
> WARNING message in pg_log.
>
> Case 1 { Huge I/O }
>
> ======
>
> When the postgresql autovacuum process is not able to get the required I/O
> to write the statistics to "stats_temp_location" then we can get this kind
> of WARNING Message. As discussed, the huge I/O may causing due to the
> checkpoint occurs on the Database.
>
>
> How to log the checkpoints information .
>
> ===============================
>
> 1) Edit the postgresql.conf file as log_checkpoints=on
>
> 2) Select Pg_Reload_Conf();
>
>
> Case 2 {Invalid stats_temp_location}
>
> ======
>
> When the postgresql "stats_temp_location" is invalid path, then in this
> case also we can expect this kind of WARNING Message. If you want to
> change this location to some other place, then we need to follow the below
> approach.
>
>
> 1) Edit the postgresql.conf file as stats_temp_location='<PATH>'
>
> 2) Select Pg_Reload_Conf();
>
>
> Case 3 {Invalid Localhost IP}
>
> ======
>
> There might be a chance, we have an invalid Localhost IP. Please check the
> localhost entires in Hosts file and rectify it if any thing wrong.
>
> Once we made any changes in this file then we need to restart the
> PostgreSQL Cluster to take it's Effect on autovacuum worker processes.
>
>
>
> I hope some one will add more on this.
>
>
> Regards,
>
> Dinesh Kumar
>
> manojadinesh.blogspot.com
>
>
>
>
>
> On Mon, Feb 4, 2013 at 5:24 PM, Jake Stride <jake(at)stride(dot)me(dot)uk> wrote:
>
>> I have had some issues with a database on EC2 and I have restored it to a
>> new instance. When vacuuming the database I am getting the following in the
>> logs;
>>
>> WARNING: pgstat wait timeout
>>
>> Is this normal/acceptable?
>>
>> Thanks
>>
>
>

--
Jake Stride

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