Re: Which replication is the best for our case ?

On 06/29/2015 08:23 AM, Arthur Silva wrote:
> On Mon, Jun 29, 2015 at 10:02 AM, ben.play <benjamin(dot)cohen(at)playrion(dot)com
> <mailto:benjamin(dot)cohen(at)playrion(dot)com>> wrote:
>
> Hi guys,
>
> We have a PG database with more than 400 GB of data.
> At this moment, a cron runs each ten minutes and updates about 10
> 000 lines
> with complex algorithms in PHP.
>
> Each time the cron runs, the website is almost down because some queries
> have to make an update on the FULL table...
>
> Therefore, I'm asking if it's possible to duplicate my main database
> on a
> slave server in order to run these cron on this second server... then,
> replicate these changes on the main database (master).
>
> Which replication is the best in this case ?
>
> http://www.postgresql.org/docs/9.3/static/warm-standby.html ?
>
> Do you have any links or tutorial which explain this kind of operation ?
>
> Thanks a lot !
>
>
>
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>
> Hello Adrian, can you give us one example of such FULL table update queries?

Actually it is the OP(Ben) that is going to have to supply that.

>
> By website down you mean slowed to a halt or read-only mode (due to the
> update locks)?
>
> Either way it doesn't look like replication is going to solve your problem.

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com