Re: Analyze using savepoints?

On Mon, Aug 09, 2004 at 04:44:58PM +0800, Christopher Kings-Lynne wrote:
> I read this in the release notes:
>
> ---
> # Database-wide ANALYZE does not hold locks across tables (Tom)
>
> This reduces the potential for deadlocks against other backends that
> want exclusive locks on tables. To get the benefit of this change, do
> not execute database-wide ANALYZE inside a transaction block (BEGIN
> block); it must be able to commit and start a new transaction for each
> table.
> ---
>
> Does that mean that now if we used savepoints internally, analyze can
> still be run in a transaction and still not hold lots of locks?

No, because savepoints do not release locks on successful completion, only
on rollback.

I think both VACUUM and ANALYZE could be best served by appropiate use
of short-lived ResourceOwners. It needs some thought though.

--
Alvaro Herrera (<alvherre[(at)]dcc(dot)uchile(dot)cl>)
"El realista sabe lo que quiere; el idealista quiere lo que sabe" (Anónimo)