Re: Begginers question

On 16 August 2017 at 20:55, Achilleas Mantzios <achill(at)matrix(dot)gatewaynet(dot)com
> wrote:

> On 16/08/2017 13:46, Alex Samad wrote:
>
>
>
> On 16 August 2017 at 16:16, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>
> wrote:
>
>> On Wed, Aug 16, 2017 at 2:32 PM, Alex Samad <alex(at)samad(dot)com(dot)au> wrote:
>> > 1) why did it fill up this time and not previously
>> > I add this
>> > archive_command = '/bin/true'
>> > wal_keep_segments = 1000 # <<< I'm guessing its this
>> >
>> > 2) how do I fix up, can I just remove the files from the pg_xlog
>> directory
>>
>
How can I work out how much space this is going to use,
I see in the comments a segment is 16M, so 1000 would have been 16G, So I
thought I would set it at 100 so 1.6G. but it ended up using about 4.5G. So
now I am confused

>
>> Don't do that. those files are managed by Postgres so you may finish
>> with a corrupted cluster. Instead you should lower the value of
>>
>
> Too late, its okay its a learning experience.
>
>
>> wal_keep_segments, reload the server parameters, and then enforce two
>> checkpoints to force WAL segments to be recycled. Note that this
>>
>
> how do I force check points
>
> checkpoint ;
> (the ; is not meant as a smiley or whatever )
>
>
>
>> depends also on the values of checkpoint_segments
>> (max_wal_size/min_wal_size in Postgres 9.5 and onwards).
>> --
>> Michael
>>
>
> thanks
>
>
> --
> Achilleas Mantzios
> IT DEV Lead
> IT DEPT
> Dynacom Tankers Mgmt
>
>