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Re: High-Profile Advocacy Opportunity: Vbulletin

From: Simon Riggs <simon(at)2ndquadrant(dot)com>
To: Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl>
Cc: Peter Eisentraut <peter_e(at)gmx(dot)net>,Josh Berkus <josh(at)agliodbs(dot)com>,Donnacha Mac Gloinn <postgresql(dot)org(at)donnacha(dot)com>,pgsql-advocacy <pgsql-advocacy(at)postgresql(dot)org>
Subject: Re: High-Profile Advocacy Opportunity: Vbulletin
Date: 2004-06-22 21:14:11
Message-ID: 1087938850.12015.31907.camel@stromboli (view raw, whole thread or download thread mbox)
Lists: pgsql-advocacy
On Tue, 2004-06-22 at 21:05, Alvaro Herrera wrote:
> On Tue, Jun 22, 2004 at 08:51:07PM +0100, Simon Riggs wrote:
> > > Why is it better than COPY?
> > COPY is designed for bulk data loading from files etc. Extended INSERTs
> > are used to minimise the number of round-trips to the database when
> > issuing a few number of similar INSERTs, as when you do an
> > Order/Order-Line (i.e. Master and many similar Details records).
> Huh?  I think you should be able to issue a single multivalued insert to
> a single table -- two queries in your Order/Order-Line example, not one.

Better explained, that would be:
**If you're doing an Order/Order-Line insert you'll do 1 INSERT to Order
and then multiple similar INSERTs to Order-Line: the multiple INSERTs
into Order-Line are when you'd use the extended INSERT feature.**

> You can do the same in Postgres issuing several commands separated with
> semicolons.  You can even use a single transaction by using BEGIN and
> COMMIT at the start and end of the string.
> I think the real gain of multivalued insert will come from using batch
> heap and index insertions, not roundtrip to the application.  At least,
> the roundtrip savings can be had with today's Postgres.

Yes, there are PostgreSQL ways of doing things, not my point, I was
explaining the MySQL rationale as I saw it.

> > On the technical side, I think we should have both extended INSERT and
> > REPLACE on the TODO list...
> I don't think REPLACE is a good idea (useless non standard MySQL-ism).
> MERGE and multivalued INSERT are.  But they depend on someone actually
> doing the work.  Both are on the TODO list, I think.

I think doing REPLACE is a trivial subset of MERGE, so should be easy
enough to pull off once MERGE gets done.

Regards, Simon Riggs

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