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Re: Performance on inserts

From: Matthew Kirkwood <matthew(at)hairy(dot)beasts(dot)org>
To: Jules Bean <jules(at)jellybean(dot)co(dot)uk>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Performance on inserts
Date: 2000-08-26 11:14:06
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Lists: pgsql-hackers
On Sat, 26 Aug 2000, Jules Bean wrote:

> Is there any simple way for Pg to combine inserts into one bulk?
> Specifically, their effect on the index files.  It has always seemed
> to me to be one of the (many) glaring flaws in SQL that the INSERT
> statement only takes one row at a time.

One of MySQL's little syntax abuses allows:

INSERT INTO tab (col1, ..) VALUES (val1, ..), (val2, ..);

which is nice for avoiding database round trips.  It's one
of the reasons that mysql can do a bulk import so quickly.

> But, using INSERT ... SELECT, I can imagine that it might be possible
> to do 'bulk' index updating. so that scanning process is done once per
> 'batch'.

Logic for these two cases would be excellent.


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