If you flush the error log using a
ERROR LOGS or
LOGS statement, or a mysqladmin
flush-logs command, the server closes and reopens any
error log file to which it is writing. To rename an error log
file, do so manually before flushing. Flushing the logs then
opens a new file with the original file name. For example,
assuming a log file name of
use the following commands to rename the file and create a new
mv host_name.err host_name.err-old
mysqladmin flush-logs error
mv host_name.err-old backup-directory
On Windows, use rename rather than mv.
If the location of the error log file is not writable by the
server, the log-flushing operation fails to create a new log
file. For example, on Linux, the server might write the error
log to the
/var/log/mysqld.log file, where
/var/log directory is owned by
root and is not writable by
mysqld. For information about handling this
case, see Section 7.4.6, “Server Log Maintenance”.
If the server is not writing to a named error log file, no error log file renaming occurs when the error log is flushed.