Comments on: SHOW VARIABLES Shows Variables MySQL Does Not Know About

By: Sheeri Cabral

Sheeri Cabral — Wed, 09 Jan 2008 14:24:54 +0000

Baron — interesting. I’m guessing by “table online” you mean the internal table?

By: Sheeri Cabral

Sheeri Cabral — Wed, 09 Jan 2008 14:24:07 +0000

William — thanx! It looks like the chart on those pages has information that the dynamic page wants — the dynamic page says it shoudl have a column for global or session or both, but it doesn’t. Very helpful!

I’m glad to know that those are the exceptions, not the rule. Still, innodb_data_home_dir shouldn’t be on the list of dynamic variables if it’s not dynamic; I’ll accept that the other case is a bug. :)

By: Xaprb

Xaprb — Wed, 09 Jan 2008 02:34:39 +0000

I wrote a program that runs through the list of variables and compares it to the table online, and finds where the online table isn’t accurate. I submitted the script as part of a bug report. Hopefully that has helped them fix the remaining problems (at the time I submitted it, there were tons of inaccuracies).

By: William

William — Wed, 09 Jan 2008 00:08:47 +0000

Hi Sheeri,

The manual indicates that the variable “innodb_data_home_dir” is Global and is Not Dynamic.

MySQL 4.1 – http://dev.mysql.com/doc/refman/4.1/en/server-system-variables.html
MySQL 5.0 – http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html

In the case of log-slow-queries sees: Bug #32565 – log_slow_queries throws an error when set dynamically – http://bugs.mysql.com/bug.php?id=32565