Horton

Re: Should I implement DROP INDEX CONCURRENTLY?

Peter Eisentraut <peter_e@gmx.net>

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From: Peter Eisentraut <peter_e@gmx.net>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Simon Riggs <simon@2ndquadrant.com>, Daniel Farina <daniel@heroku.com>, pgsql-hackers <pgsql-hackers@postgresql.org>
Date: 2012-01-16T19:06:18Z
Lists: pgsql-hackers 
On mån, 2012-01-16 at 11:17 -0500, Robert Haas wrote:
> I don't see how setting indisvalid to false helps with this, because
> IIUC when a session sees indisvalid = false, it is supposed to avoid
> using the index for queries but still make new index entries when a
> write operation happens - but to drop an index, I think you'd need to
> get into a state where no one was using the index for anything at all.

ISTM that one would need to set indisready to false instead.