>>>>> "Chai-Hup" == Chai-Hup Chen <hup@stripped> writes:
Chai-Hup> The log file under /db_dir/mysql/var/my_host.log may grow to be very
Chai-Hup> huge (>1G each week in my case), which is too big to be read.
Chai-Hup> Since I have a live system, I can't use a script to remove the log file,
Chai-Hup> shutdown and restart mysqld. Any way that I can keep the log file in a
Chai-Hup> readable size?
I just added the following entry to the MySQL manual. Hope it helps:
Log file maintenance
When using *MySQL* with log files, you will from time to time want to
remove/backup old log files and tell *MySQL* to start logging on new
files. *Note Update log::
One a Linux (`Redhat') installation, you can use the `mysql-log-rotate'
script for this. If you installed `MySQL' from an RPM distribution, the
script should have been installed automaticly.
On other systems you must yourself install a short script that you
start from `cron' to handle log files.
You can force `MySQL' to start using new log files by using `mysqladmin
flush-logs' or by using the SQL command `FLUSH LOGS'.
The above command does the following:
* If standard logging (`--log') is used, closes and reopens the log
file. (`mysql.log' as default).
* If update logging (`--log-update') is used, closes the update log
and opens a new log file with a higher sequence number.
If you only are using an update log, you only have to flush the logs
and then move away the old update log files to a backup. If you are
using the normal logging, you can do something like:
mv mysql.log mysql.old
and then take a backup and remove `mysql.old'.