does "select count(*) from mytable" always do a seq scan?

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От
Culley Harrelson
Тема
does "select count(*) from mytable" always do a seq scan?
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529825a3050107064538c85b55@mail.gmail.com
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does "select count(*) from mytable" always do a seq scan? Culley Harrelson <harrelson@gmail.com>
Re: does "select count(*) from mytable" always do a seq Tino Wildenhain <tino@wildenhain.de>
Re: does "select count(*) from mytable" always do a seq Bruno Wolff III <bruno@wolff.to>
Re: does "select count(*) from mytable" always do a seq scan? Culley Harrelson <harrelson@gmail.com>
Re: does "select count(*) from mytable" always do a seq scan? Alex Turner <armtuk@gmail.com>
Re: does "select count(*) from mytable" always do a seq Scott Ribe <scott_ribe@killerbytes.com>
Re: does "select count(*) from mytable" always do a seq Alex Turner <armtuk@gmail.com>
Re: does "select count(*) from mytable" always do a seq Scott Ribe <scott_ribe@killerbytes.com>
Re: does "select count(*) from mytable" always do a seq Alex Turner <armtuk@gmail.com>
Re: does "select count(*) from mytable" always do a seq Bruno Wolff III <bruno@wolff.to>
Re: does "select count(*) from mytable" always do a seq Alex Turner <armtuk@gmail.com>
Re: does "select count(*) from mytable" always do a seq Alvaro Herrera <alvherre@dcc.uchile.cl>
Re: does "select count(*) from mytable" always do a seq Bruno Wolff III <bruno@wolff.to>
Re: does "select count(*) from mytable" always do a seq Michael Fuhr <mike@fuhr.org>
Re: does "select count(*) from mytable" always do a seq Pierre-Frédéric Caillaud<lists@boutiquenumerique.com>
Hi,

I am using Postgresql 7.4.  I have a table with 1.5 million rows.  It
has a primary key. VACUUM FULL ANALYZE is run every night.  There are
2000-5000 inserts on this table every day but very few updates and
deletes.  When I select count(*) from this table it is using a
sequence scan.  Is this just life or is there some way to get this to
do an index scan?

culley
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