From: Matthew Hagerty <matthew@venux.net>
To: pgsql-interfaces@postgreSQL.org
Subject: LIMIT and 6.5
Date: Fri, 04 Jun 1999 22:55:00 -0400
Message-ID: <4.1.19990604224611.00a838e0@mail.venux.net> (raw)
Greetings,
I was wondering if the new LIMIT command in 6.5 is implemented in such a
way that it does in fact improve query time and memory on large result
sets? I was reading a patch that gives the LIMIT command capability to
6.4.2, but there was a note that indicated that the query processor still
had to evaluate the whole query and only *returns* the indicated number of
tuples/rows. Is that the case with 6.5 also? If so, what is the use of
having such a command if it does not improve performance or save memory?
It is already possible (and easy) to just grab x number of tuples/rows from
a query since most of the time they are fetched in a loop anyway.
Thanks,
Matthew Hagerty
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Cc: matthew@venux.net
Subject: Re: LIMIT and 6.5
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