Обсуждение: Postgres Upgrade from 8.4 to 9.1
Hi,
I am planning a Postgres migration from 8.4 to 9.1 to be able to leverage the replication features available in the 9.1 version. I would like to understand the following things in this regard:
1. Any good documentation which should help in this upgrade.
2. To be able to replicate the complete steps in a test environment before doing it in LIVE which is running 9.0, is it possible to revert this database to 8.4 and then upgrade to 9.1.
3. Any known issues and changes required to be done in the application for this upgrade.
Thanks,
rajiv
The most important documentation here is the release notes for the major .0 versions:Hi,
I am planning a Postgres migration from 8.4 to 9.1 to be able to leverage the replication features available in the 9.1 version. I would like to understand the following things in this regard:
1. Any good documentation which should help in this upgrade.
http://www.postgresql.org/docs/current/static/release-9-1.html
http://www.postgresql.org/docs/current/static/release-9-0.html
... in particular the "Migration to" sections.
No. Take a copy before upgrading. Always. Keep the copy read-only in some safe place.2. To be able to replicate the complete steps in a test environment before doing it in LIVE which is running 9.0, is it possible to revert this database to 8.4 and then upgrade to 9.1.
If you want to revert, make a copy of your backup and use that.
Upgrades from 8.4 to 9.0 or 9.1 require a dump and reload or the use of the pg_upgrade tool. You can't just install the new version and start it on your old database.
3. Any known issues and changes required to be done in the application for this upgrade.
See the release notes.
--
Craig Ringer