Re: Massive performance issues
От | Alvaro Herrera |
---|---|
Тема | Re: Massive performance issues |
Дата | |
Msg-id | 20050901195347.GA31519@surnet.cl обсуждение исходный текст |
Ответ на | Massive performance issues (Matthew Sackman <matthew@lshift.net>) |
Список | pgsql-performance |
On Thu, Sep 01, 2005 at 03:51:35PM -0400, Merlin Moncure wrote: > > Huh, hang on -- AFAIK there's no saving at all by doing that. Quite > > the opposite really, because with char(x) you store the padding > > blanks, which are omitted with varchar(x), so less I/O (not > > necessarily a measurable amount, mind you, maybe even zero because > > of padding issues.) > > You are right, all this time I thought there was a 4 byte penalty for > storing varchar type and not in char :(. So there is no reason at all > to use the char type? Other than SQL conformance, apparently not. -- Alvaro Herrera -- Valdivia, Chile Architect, www.EnterpriseDB.com Bob [Floyd] used to say that he was planning to get a Ph.D. by the "green stamp method," namely by saving envelopes addressed to him as 'Dr. Floyd'. After collecting 500 such letters, he mused, a university somewhere in Arizona would probably grant him a degree. (Don Knuth)
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