Re: [OT] MySQL is bad, but THIS bad?

Florian Weimer <fw@deneb.enyo.de>

From: Florian Weimer <fw@deneb.enyo.de>
To: "Mark Woodward" <pgsql@mohawksoft.com>
Cc: pgsql-hackers@postgresql.org
Date: 2006-05-18T05:18:53Z
Lists: pgsql-hackers
* Mark Woodward:

> "On the other hand, you shouldn't use mysql_use_result() if you are doing
> a lot of processing for each row on the client side, or if the output is
> sent to a screen on which the user may type a ^S (stop scroll). This ties
> up the server and prevent other threads from updating any tables from
> which the data is being fetched."
>
> How do busy web sites work like this?

Any system based on locking exhibits this problem.  Even with MVCC,
you can run into it if you've got multiple writers.  As a rule of
thumb, I never perform network I/O within transactions which update
the database (or "read the database", for systems without MVCC).