The bin-log files can be find in folders like /var/lib/mysql/. Their filenames are in the format of mysqld-bin.000001, mysqld-bin.000002, ...

To disable bin-logging, comment out the line "log-bin=..." in /etc/my.cnf.

To change the log size, edit the variable value of "max_binlog_size" in /etc/my.cnf.

For more information, reference:

• http://dev.mysql.com/doc/refman/5.0/en/binary-log.html
• http://dev.mysql.com/doc/refman/5.0/en/purge-binary-logs.html