Re: [SQL] what is "cost"?
От
Gregory Holston
Тема
Re: [SQL] what is "cost"?
Дата
Msg-id
Pine.SUN.3.91.990423172542.17226C-100000@shell
Ответ на
Re: [SQL] what is "cost"? (Bruce Momjian)
Список
Дерево обсуждения
what is "cost"? Gregory Holston <holston@itd.nrl.navy.mil>
Re: [SQL] what is "cost"? Bruce Momjian <maillist@candle.pha.pa.us>
Re: [SQL] what is "cost"? Gregory Holston <holston@itd.nrl.navy.mil>
Re: [SQL] what is "cost"? Bruce Momjian <maillist@candle.pha.pa.us>
On Fri, 23 Apr 1999, Bruce Momjian wrote: > > > > Hi All, > > > > I just did an explain and was wondering what is meant by cost. I just > > got a 72.983 cost from a query I found not working. Any info or pointers > > would be appreciated. > > Just added to explain manual page: > > The cost value is only meaningful to the optimizer in comparing various > query plans. > I got the 72.98 on this table while doing a simple "select * from publication" meanwhile I got nothing higher than 4 on any other table. Is this indicative of a problem? -Greg
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