Re: making an unlogged table logged

On Tue, Jan 4, 2011 at 10:56 PM, Rob Wultsch <wultsch@gmail.com> wrote:
> 1. Could the making a table logged be a non-exclusive lock if the
> ALTER is allowed to take a full checkpoint?

No, that doesn't solve either of the two problems I described, unfortunately.

> 2. Unlogged to logged has giant use case.

Agree.

> 3. In MySQL I have had to ALTER tables to engine BLACKHOLE because
> they held data that was not vital, but the server was out of IO. Going
> logged -> unlogged has a significant placed, I think.

Interesting.  So you'd change a logged table into an unlogged table to
cut down on I/O, and take the risk of losing the data if the server
went down?

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company