WAL archive on slave

Hello,

My understanding is that WAL archiving can not be enabled on the slave in a
streaming replication pair.

If this is correct, is there a reason behind it? I can see logs showing up
in pg_xlog, so could they not be archived?

The reason I ask is if this happened it would allow the following with a
streaming replication pair (A,B):

1. Start A as master
2. Attach B as slave using basebackup
3. work ....
4. Promote B to master
5. Restore A from a scheduled backup to a time before promotion
6. Attach A as slave pointing at B's WAL archive

If we used A's WAL archive in this case and A had writes after the
promotion then we would get timeline errors.

As far as I can tell, using the WAL archive from B would resolve this issue.

Or have I missed something here?

Cheers,

Cheers,

James Sewell,
PostgreSQL Team Lead / Solutions Architect
______________________________________

Level 2, 50 Queen St, Melbourne VIC 3000

*P *(+61) 3 8370 8000 *W* www.lisasoft.com *F *(+61) 3 8370 8099

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