If you flush the error log using
or mysqladmin flush-logs, 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
to rename the file and create a new one, use the following
mv host_name.err host_name.err-old mysqladmin flush-logs 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 5.4.7, “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.