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List:       postgresql-general
Subject:    Re: [GENERAL] Which replication is the best for our case ?
From:       John R Pierce <pierce () hogranch ! com>
Date:       2015-06-30 19:15:22
Message-ID: 5592EACA.2090009 () hogranch ! com
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On 6/30/2015 9:57 AM, ben.play wrote:
> To be more precise : We have a database with more than 400 Gb and ONE table
> with more than 100 Gb of data. This is huge for doctrine. When the cron
> runs, it writes a lot on the disks in temporary file (although we have 128
> GB of Ram...). Of course, each table is well indexes...
>
> That is why I'm thinking about replication : My server A (master) is for my
> users... and my server B is a server reserved for calculations (and this
> server B which writes on the base)
>
> This is a image of my dream system :
> <http://postgresql.nabble.com/file/n5855916/9e41ce1f-38ea-4fba-a437-a43c598e655c.jpg>  
> (If you can't see the image :
> http://tof.canardpc.com/view/9e41ce1f-38ea-4fba-a437-a43c598e655c.jpg)


what happens when master A continues to update/insert into these tables 
that your cron job is batch updating on the offline copy ? How would you 
merge those changes in ?



-- 
john r pierce, recycling bits in santa cruz



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