The Sysadmin’s Daily Grind: Mtop

HEALTH CHECK

Author(s):

It would be great if every MySQL database enjoyed perfect health 24 by 7, but unfortunately, trouble sometimes strikes. A logfile isn’t much help if you are investigating why a database is flooded with requests. Mtop to the rescue.

We looked at ApacheTop in this column not too long ago. ApacheTop is a tool that tells you what your web server is doing right now, pointing out potential bottlenecks. In this month’s column, we will be looking at another member of the top family: Mtop, the realtime monitor for MySQL [1]. The Mtop tarball weighs in at a mere 48 kbytes. It requires a few Perl modules: Curses, DBI, DBD::mysql, and Net::Domain – but you will probably have most of these installed anyway, and CPAN will fill any gaps in next to no time. After satisfying the dependencies, enter perl Makefile.PL, make, and make install in /usr/local/bin/ to complete the Mtop build. The next step is to allow Mtop access to your MySQL process information, as – in contrast to Apachetop – Mtop does not simply parse the server logfiles, but requires direct access. I decided to set up a user with extremely restricted privileges in MySQL and did not assign a password. The following SQL prompt should do the trick for version 4.0.2 or newer of MySQL: grant super, reload, U process on *.* to mysqltop; grant super, reload, U process on *.* to mysqltop@localhost; flush privileges;

Read full article as PDF:

Charly_Column.pdf (100.60 kB)

Related content

  • Charly's Column

    Well-used services write reams of log information to disk, which is not only bothersome from a storage perspective but also pushes grep and the usual group of statistics tools to their limits. Will hitching the syslog daemon up to a database help?

  • Charly's Column

    When ports on a host start opening and closing like window shutters in a gale, it’s time for admins to pay attention.

  • Charly's Column

    Worms, mail bombs, and users who send multiple megabyte Powerpoint files across the wire give Postfix administrators plenty of reasons to view their charges with a critical eye from time to time.

  • Charly's Column

    Some people don’t mind leaving traces of their IP address wherever they go, others prefer to use a tool like The Onion Router.

  • Charly's Column – Go Access

    Just as a craftsman is unlikely to purchase a new angle grinder every month, sys admins are unlikely to change constantly their tried and trusted tools. Columnist Charly Kühnast ditches this conservative philosophy this month, lured by the charms of a new logfile tool.

comments powered by Disqus

Direct Download

Read full article as PDF:

Charly_Column.pdf (100.60 kB)

News