From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
---|---|
To: | Anj Adu <fotographs(at)gmail(dot)com> |
Cc: | pgsql-admin(at)postgresql(dot)org |
Subject: | Re: migrating from 8.1.x to 8.2 |
Date: | 2009-07-20 18:39:36 |
Message-ID: | 20090720183936.GQ4938@alvh.no-ip.org |
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Thread: | |
Lists: | pgsql-admin |
Anj Adu escribió:
> We plan to migrate from 8.1.X to 8.2 . I understand that XID
> wraparound has changed with the 8.2 release (maintained per table
> versus entire database). XID wraparound is important for us as we have
> large databases (800Gb +) and also use lot of partitioned inherited
> tables.
>
> Is XID tracking done per inherited table (independent of parent?) ...
Yes, partitions are considered separate tables for this.
> If a parent table is just a dummy to implement partition..do we need
> to worry about XID wraparound for this table (assuming no data makes
> it to this physical table)
The parent table will need to be vacuumed once every 2 billion
transactions or whatever your settings say, but since the table is empty
anyway it shouldn't matter much.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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