Re: Best practice when reindexing in production

On Wed, May 29, 2013 at 2:26 PM, Magnus Hagander <magnus(at)hagander(dot)net>wrote:

> On Wed, May 29, 2013 at 8:24 AM, Niels Kristian Schjødt
> <nielskristian(at)autouncle(dot)com> wrote:
> > Hi,
> >
> > I have a database with quite some data (millions of rows), that is
> heavily updated all the time. Once a day I would like to reindex my
> database (and maybe re cluster it - don't know if that's worth it yet?). I
> need the database to be usable while doing this (both read and write). I
> see that there is no way to REINDEX CONCURRENTLY - So what approach would
> you suggest that I take on this?
>
> If you have the diskspaec, it's generally a good idea to do a CREATE
> INDEX CONCURRENTLY, and then rename the new one into place (typically
> in a transaction). (If your app, documentation or dba doesn't mind the
> index changing names, you don't need to rename of course, you can just
> drop the old one).
>

If you wish to recluster it online you can also look into pg_repack -
https://github.com/reorg/pg_repack Great tool allows you to repack and
reindex your database without going offline.