1，查看log情况
mysql> show global variables like '%log%';
+---------------------------------+---------------------------------+
| Variable_name | Value |
+---------------------------------+---------------------------------+
| back_log | 50 |
| binlog_cache_size | 32768 |
| binlog_format | MIXED |
| expire_logs_days | 0 |
| general_log | ON |
| general_log_file | /usr/local/mysql/mysql.log |
| log | ON |
| log_bin | ON |
| log_bin_trust_function_creators | OFF |
| log_bin_trust_routine_creators | OFF |
| log_error | /var/log/mysqld.log |
| log_output | FILE |
| log_queries_not_using_indexes | OFF |
| log_slave_updates | OFF |
| log_slow_queries | ON |
| log_warnings | 1 |
| max_binlog_cache_size | 4294963200 |
| max_binlog_size | 1073741824 |
| max_relay_log_size | 0 |
| relay_log | |
| relay_log_index | |
| relay_log_info_file | relay-log.info |
| relay_log_purge | ON |
| relay_log_space_limit | 0 |
| slow_query_log | ON |
| slow_query_log_file | /usr/local/mysql/mysql-slow.log |
| sql_log_bin | ON |
| sql_log_off | OFF |
| sql_log_update | ON |
| sync_binlog | 0 |
+---------------------------------+---------------------------------+
30 rows in set (0.00 sec)
上面主要有三个日志文件，mysql.log,mysqd.log,mysql-slow.log，除了mysqld.log不能通过mysqladmin flush-logs来刷新日志外，其他的都可以，mysqld.log是服务器启动程序mysqld产生的。
2，生成日志刷新用户
mysql> GRANT RELOAD ON *.* TO 'log'@'localhost' IDENTIFIED BY 'log';
Query OK, 0 rows affected (0.07 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.03 sec)
用root账户登录进去，添加一个log的用户。分开清楚一点。
3，日志滚动脚本，只保留一个星期的日志
[root@linux ~]# vim log.sh //添加以下内容
#!/bin/sh
# log refresh
if [ -f $1 ];
then
echo "refresh ok" 1>&2
else
echo "log file do not exist;"
exit 1
fi
LOG=$1
DB_USER="log"
DB_PASS="log"
# Others vars
DATE=`date +%w`
BIN_DIR="/usr/local/mysql/bin"
mv ${LOG} ${LOG}_${DATE}
${BIN_DIR}/mysqladmin -ulog -plog flush-logs
添加可执行权限chmod +x log.sh
脚本很简单，不过有一点要解释一下，就是mv ${LOG} ${LOG}_${DATE}，第一周会产生7个文件，第二周会覆盖上周的，星期一覆盖星期一，星期二覆盖星期二，以此内推。
4，日志滚动
[root@linux ~]# ./log.sh /usr/local/mysql/mysql.log
refresh ok
[root@linux ~]# ls /usr/local/mysql/ |grep mysql
mysql.log
mysql.log_1
