Re: Survey on backing up unlogged tables: help us with PostgreSQL development!

On 11/16/2010 05:55 PM, Josh Berkus wrote:
>
>> If you do wish to have the data tossed out for no good reason every so
>> often, then there ought to be a separate attribute to control that. I'm
>> really having trouble seeing how such behavior would be desirable enough
>> to ever have the server do it for you, on its terms rather than yours.
>
> I don't quite follow you. The purpose of unlogged tables is for data
> which is disposable in the event of downtime; the classic example is the
> a user_session_status table. In the event of a restart, all user
> sessions are going to be invalid anyway.
>

As was already mentioned, application logs. Unlogged tables would be
perfect for that, provided they don't go *poof* every now and then for
no good reason. Nobody's going to be too heart broken if a handful of
log records go missing, or get garbled, after a server crash or power
outage. Delete 'em all after every restart though, and that's a problem.

-Glen