RE: [HACKERS] Index recreation in vacuum

> -----Original Message-----
> From: Dmitry Samersoff [mailto:dms@wplus.net]
>
> Hiroshi Inoue wrote:
> > > > Yes,I believe so.  It's necessary to keep consistency between heap
> > > > table and indexes even in case of abort/crash.
> > > > As far as I see,it has been a big charge for vacuum.
> > >
> > > OK, how about making a copy of the heap table before starting vacuum,
> > > moving all the tuples in that copy, create new index, and
> then move the
> > > new heap and indexes over the old version.  We already have
> an exclusive
> > > lock on the table.  That would be 100% reliable, with the disadvantage
> > > of using 2x the disk space.  Seems like a big win.
> > >
> >
> > I heard from someone that old vacuum had been like so.
> > Probably 2x disk space for big tables was a big disadvantage.
>
> Yes, It is critical.
>
> How about sequence like this:
>
> * Drop indices (keeping somewhere index descriptions)
> * vacuuming table
> * recreate indices
>

Yes,my idea is almost same.
I won't drop indices but make them invisible in a sense.

Regards.

Hiroshi Inoue
Inoue@tpf.co.jp