On Mar 14, 2011, at 7:36 PM, Alexander Pyhalov wrote:

> Am I right that on PostgreSQL upgrade to new major version (e.g. from 9.0 to 
> 9.1) I'll loose my backups (base backups and wal files will be useless)?

Yes, those Backups would not be valid.

> So to go to past after DB upgrade  I had to install old version(9.0), recover 
> data and then upgrade DBMS software...

You won't be able to use the Data Directory of New Version for PG 9.0, you have 
to use your old backup.

> What is the preferred way to deal with this issue?

I would recommend to take pg_dump backup with Filesystem Backup before any 
upgrade.

Can you explain, why are you upgrading to 9.1? Currently there is no Prduction 
release of 9.1.

Thanks & Regards,
Vibhor Kumar
EnterpriseDB Corporation
The Enterprise PostgreSQL Company
vibhor.ku...@enterprisedb.com
Blog:http://vibhork.blogspot.com


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