Re: 100% failover + replication solution

I wrote this for the 8.2 documentation. Let me know if it helps or you
have other suggestions:

http://developer.postgresql.org/pgdocs/postgres/failover.html

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Moiz Kothari wrote:
> Guys,
>
> I have been thinking about this and wanted to see if it can be achived. I
> wanted to make a 100% failover solution for my postgres databases. The first
> thing that comes to my mind is doing it using WAL logs. Am attaching the
> diagram for which i will write more here.
>
> I was thinking if i can have Hotsync the databases using the WAL logs. If
> you see the architecture, the select goes to the SLAVE nodes and the INSERTS
> goes to the MASTER database, that means there should be no transactions
> happening on SLAVES (pure select). not even using "plpgsql". In this
> archecture i wont even mind restarting the SLAVE nodes if i need to.
>
> I was reading on PIT recovery on postgres, the only current problem i am
> facing with that is, i need to backup the database and move the slaves and
> the apply WAL logs to it. That could be huge amount of transfer and hence a
> longer downtime then moving 16mb WAL log files.
>
> Can someone help me out here, what i want is a continuous applying of WAL
> logs once i have brought the database up. I want to elimiate the backup of
> master to be restored to the slaves everytime i want to apply WAL to slaves.
> It would be real help if someone can tell me if it is possible to apply WAL
> logs to the slaves continously as soon as they are created on MASTER. I
> checked other tools available and thougth this would be best approach if it
> works.
>
> Awaiting reply soon.
>
> Regards,
> Moiz Kothari

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