Re: Large object + FREEZE?
От | Tatsuo Ishii |
---|---|
Тема | Re: Large object + FREEZE? |
Дата | |
Msg-id | 20130703.012940.1142100617623302179.t-ishii@sraoss.co.jp обсуждение исходный текст |
Ответ на | Re: Large object + FREEZE? (Robert Haas <robertmhaas@gmail.com>) |
Список | pgsql-hackers |
> On Mon, Jul 1, 2013 at 11:16 PM, Tatsuo Ishii <ishii@postgresql.org> wrote: >> Now that we have COPY FREEZE, I'm thinking about adding similar option >> to creating large objects. In 9.3 the maximum size of large objects >> are increased. That means, the first access to a large object will >> trigger more writes because of hint bit updation. Also subsequent >> VACUUM may trigger that as well. If we could freeze arge objects while >> creating, it could reduce the writes dramatically as COPY FREEZE >> already does. >> >> Opinions? > > COPY FREEZE only works if the table was created in the same > transaction. Otherwise, an error midway through could leave the table > and index inconsistent. I think that's a killer for this proposal, > because obviously when a large object is created, pg_largeobject will > be pre-existing. Argh. You are right. -- Tatsuo Ishii SRA OSS, Inc. Japan English: http://www.sraoss.co.jp/index_en.php Japanese: http://www.sraoss.co.jp
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