When working with a production (P) and a DR (D) environment it is often a
requirement to be able to protect against data loss when promoting within a
site, and also when losing A and promoting a master at D.

The current synchronous_standby_names do not allow this.

In a simple example we could take the following nodes:

P1 (current master), P2, P3
D1, D2, D3

Where P1 is replicating to (P2, P3, D1, D2, D3).

The closest synchronous_standby_names  setting you could get to my use case
would be:

1 (D1, D2, D3)

This would allow the loss of either site without losing data - however it
would not allow promotion within site P from P1 -> (P2 | P3)  without the
potential for data loss.

What is needed to support this is the ability to configure Px with
something like:

 1 (P1, P2, P3), 1 (D1, D2, D3)

Would there be any appetite for this - or would it be seen as over
complication of the current rules?


James Sewell,
PostgreSQL Team Lead / Solutions Architect

Suite 112, Jones Bay Wharf, 26-32 Pirrama Road, Pyrmont NSW 2009
*P *(+61) 2 8099 9000 <(+61)%202%208099%209000>  *W* www.jirotech.com  *F *
(+61) 2 8099 9099 <(+61)%202%208099%209000>


The contents of this email are confidential and may be subject to legal or 
professional privilege and copyright. No representation is made that this 
email is free of viruses or other defects. If you have received this 
communication in error, you may not copy or distribute any part of it or 
otherwise disclose its contents to anyone. Please advise the sender of your 
incorrect receipt of this correspondence.

Reply via email to