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Re: [HACKERS] What can we learn from MySQL?

From: Tim Conrad <tim(at)timconrad(dot)org>
To: Alexey Borzov <borz_off(at)cs(dot)msu(dot)su>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>,PostgreSQL advocacy <pgsql-advocacy(at)postgresql(dot)org>
Subject: Re: [HACKERS] What can we learn from MySQL?
Date: 2004-04-27 16:07:11
Message-ID: 20040427160711.GA67934@external.timconrad.org (view raw or flat)
Thread:
Lists: pgsql-advocacypgsql-hackerspgsql-www
On Tue, Apr 27, 2004 at 07:55:08PM +0400, Alexey Borzov wrote:
> Hi!
> 
> Tim Conrad wrote:
> >I was researching an article I wrote about a comparison between
> >Postgres and MySQL recently (If you want, you can read the article
> >at http://www.devx.com/dbzone/Article/20743/). I noticed some clear
> >differences between the mysql.com website and the Postgres website.
> 
> Sorry, couldn't resist: may I suggest doing the research *before* 
> writing an article, not *after*?
> 
> My favourite part of it is:
> --------
> MySQL uses traditional row-level locking. PostgreSQL uses something 
> called Multi Version Concurrency Control (MVCC) by default. MVCC is a 
> little different from row-level locking in that transactions on the 
> database are performed on a snapshot of the data and then serialized. 
> New versions of PostgreSQL support standard row-level locking as an 
> option, but MVCC is the preferred method.
> --------
Nice that you point out that incorrectly stated something. Even
nicer that you don't tell me what the correct answer would be.
Unfortunanatly, that's the best I could come up with with doing
research with the documentation I could find on the subject. MVCC
does a  lot more than can be easily contained in a sentance. 


> 
> >2) There doesn't seem to be a clear roadmap on Postgres features.
> >   When certian things are expected. There's the TODO list that
> >   Bruce maintains, but it only outlines 'near' fixes. MySQL has a
> >   nice listing of what to expect in certian future versions. I know
> >   it's not a perfect list, but it'd be nice to know when full blown
> >   replication will be included in PostgreSQL as an example.
> 
> MySQL's roadmap is complete bullshit. Subselects were first promised in 
> 4.0, which was "not that far away" [1] back in 1998! Well, they are in 
> 4.1, which is still alpha in 2004.

I realize this.  I also realize that having a nicely defined roadmap would
give Postgres a hands up in this category. 

> 
> Of course, some gullible people actually believe this and compare [2] 
> the existing and working implementations with vaporware (MySQL 5.1, 
> anyone?).
> 
> >   On those same lines, there doesn't seem to be anything about the
> >   improvements in the minor versions. It seems that in every
> >   release (i.e. 7.2,7.3,7.4) there are pretty significant changes,
> >   but finding a place that outlines these changes is somewhat
> >   difficult. 
> 
> Have you tried looking in the release notes [3]?
> 
> 
> [1] http://www.geocrawler.com/archives/3/194/1998/8/0/1061364/
> [2] http://www.devx.com/dbzone/Article/20743/1763?supportItem=1
> [3] http://www.postgresql.org/docs/7.4/interactive/release.html

I guess I'm an ignorant fool and I don't comprehend many of the
items under the release note. I'm also looking for something I can
hand my boss and say ' this is why we should use postgres instead of
oracle'.

Tim

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