Re: streaming replication + wal shipping

Anupama Ramaswamy wrote:
> I would like to setup a 2 servers with streaming replication, one master and another hot standby.
> I want to use the standby for read-only queries. So I want the replication lag to be as small as
> possible.
> So I choose streaming replication over WAL shipping.
> 
> When the master fails, I want the standby to take over as master. So I would like minimal data loss,
> if there is a streaming replication delay.
> 
> Is it possible to setup such a way that under normal conditions the standby by replicating using
> streaming replication and on failover, it uses the WAL archive for syncing up with the transactions.
> Of course the WAL will be available on a shared storage volume. If this is possible, what exactly do I
> need in my configuration files - postgresql.conf, recovery.conf ?

Most of this will happen automatically - WAL archives are used if recovery
falls behind.

Where you will need additional software is automatic failover; you need some
OS cluster software that can detect failure and automatically promote the standby.

Yours,
Laurenz Albe