| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Fabrízio de Royes Mello <fabriziomello(at)gmail(dot)com> |
| Cc: | Christoph Berg <cb(at)df7cb(dot)de>, Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org>, Stephen Frost <sfrost(at)snowman(dot)net> |
| Subject: | Re: [GSoC2014] Patch ALTER TABLE ... SET LOGGED |
| Date: | 2014-07-16 18:25:42 |
| Message-ID: | 20140716182542.GA12629@alap3.anarazel.de |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
Hi,
I quickly looked at this patch and I think there's major missing pieces
around buffer management and wal logging.
a) Currently buffers that are in memory marked as
permanent/non-permanent aren't forced out to disk/pruned from cache,
not even when they're dirty.
b) When converting from a unlogged to a logged table the relation needs
to be fsynced.
c) Currently a unlogged table changed into a logged one will be
corrupted on a standby because its contents won't ever be WAL logged.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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