Comments on: Enabling/Disabling query log without server restart in MySQL 5.0

By: peter

peter — Wed, 30 Jul 2008 16:13:54 +0000

You can’t turn on/off slow query log globally in MySQL 5.0 (though you can use trick described)

By: jk

jk — Tue, 29 Jul 2008 18:15:14 +0000

allow me to follow up on this post:
So does mysql 5.0.X not allow dynamically switching general query at all?

By: peter

peter — Sat, 12 Jul 2008 00:56:17 +0000

Bill,

It was my impression this allows to disable logging statements for this session only, while I’m speaking about global log.

By: bill

bill — Sat, 12 Jul 2008 00:14:08 +0000

set sql_log_off = ‘ON’;
turns of the log without restarting

set sql_log_off = ‘OFF’;
turns it back on

this works on 5.0, anyway

By: Eike Herzbach

Eike Herzbach — Sun, 16 Sep 2007 13:50:59 +0000

Just tried out the query sniffer, it works great and is dead simple to use:

apt-get install libpcap0.8 (if needed)
curl http://iank.org/querysniffer/querysniffer-0.10.tar.gz | tar xvzf -
querysniffer-0.10/mysqlsniff.x64

I like this unobtrusive way of debugging!

Cheers,
Eike

By: peter

peter — Fri, 14 Sep 2007 10:52:08 +0000

Thanks Keith,

Indeed query sniffer is another good way to approach the same problem.

By: Keith Murphy

Keith Murphy — Thu, 13 Sep 2007 21:02:03 +0000

It seems that great minds think alike. I wasn’t aware of your patch. And the proxy hadn’t been released when we started working on our query sniffer program. The sniffer is a bit different in that is a perl program that uses the libpcap library. It can be started and stopped at any time and you can direct output to a file without any problems.

By: peter

peter — Thu, 13 Sep 2007 18:57:54 +0000

Thanks Giuseppe,

This is indeed other good way.

By: Giuseppe Maxia

Giuseppe Maxia — Thu, 13 Sep 2007 16:26:41 +0000

Hi,
As an alternative, you can enable a log on-the fly, in any version from 4.1 to 6.0, using MySQL Proxy with an appropriate script. http://forge.mysql.com/snippets/view.php?id=81
To reroute the traffic without need of disconnecting the clients, you can use a IPTABLES command
http://forge.mysql.com/snippets/view.php?id=82
Cheers

Giuseppe