Re: Need for re-index after pg_upgrade
På mandag 29. juni 2015 kl. 15:42:22, skrev Tom Lane <tgl@sss.pgh.pa.us>:
Andreas Joseph Krogh <andreas@visena.com> writes:
> In the man-page for pg_upgrade we see this:
> pg_upgrade will require a reindex if:
> * an index is of type hash or GIN
I think that probably refers to some version-specific upgrade
situations; I can't see a reason why it would be true in general.
Bruce, doesn't that doc need improvement?
regards, tom lane
I'm specifically thinking about this (from 9.4 release-notes):
E.5.3.1.1. Indexes
Reduce GIN index size (Alexander Korotkov, Heikki Linnakangas)
Indexes upgraded via pg_upgrade will work fine but will still be in the old, larger GIN format. Use REINDEX to recreate old GIN indexes in the new format.
It'd be great if pg_upgrade generated re-index scripts to make those indexes use the new format.
-- 
Andreas Joseph Krogh
CTO / Partner - Visena AS
Mobile: +47 909 56 963
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