Re: [HACKERS] Sequential scan speed, mmap, disk i/o
От | Bruce Momjian |
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Тема | Re: [HACKERS] Sequential scan speed, mmap, disk i/o |
Дата | |
Msg-id | 199805141454.KAA09189@candle.pha.pa.us обсуждение исходный текст |
Ответ на | Re: [HACKERS] Sequential scan speed, mmap, disk i/o (dg@illustra.com (David Gould)) |
Ответы |
Re: [HACKERS] Sequential scan speed, mmap, disk i/o
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Список | pgsql-hackers |
> Very interesting. Is it possible to get the schema, the query, and a > a sample of the data or a generator program for the data? I am quite surprised > to see us do so well, I would have guess that the per row overhead would > have us down far below wc. Sure. create table test (x1 int, x2 int, x3 char(10), x4 varchar(50)); insert into test values (3, 8, 'asdf','asdf'); insert into test select * from test; <- continue until test is large select * from test where x1 = 23423; <- this is what I timed -- Bruce Momjian | 830 Blythe Avenue maillist@candle.pha.pa.us | Drexel Hill, Pennsylvania 19026 + If your life is a hard drive, | (610) 353-9879(w) + Christ can be your backup. | (610) 853-3000(h)
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