1.查找当前有哪些二进制日志文件：
mysql> show binary logs;
+------------------+-----------+
| Log_name | File_size |
+------------------+-----------+
| mysql-bin.000001 | 1357315 |
| mysql-bin.000002 | 117 |
| mysql-bin.000003 | 404002 |
| mysql-bin.000004 | 2050722 |
| mysql-bin.000005 | 139103 |
| mysql-bin.000006 | 46702 |
| mysql-bin.000007 | 117 |
| mysql-bin.000008 | 98 |
| mysql-bin.000009 | 117 |
| mysql-bin.000010 | 1254 |
| mysql-bin.000011 | 117 |
| mysql-bin.000012 | 29394942 |
| mysql-bin.000013 | 422100 |
| mysql-bin.000014 | 117 |
| mysql-bin.000015 | 117 |
| mysql-bin.000016 | 98 |
| mysql-bin.000017 | 117 |
| mysql-bin.000018 | 117 |
| mysql-bin.000019 | 285300 |
| mysql-bin.000020 | 181229 |
| mysql-bin.000021 | 98 |
+------------------+-----------+
21 rows in set (0.03 sec)
2.删除bin-log(删除mysql-bin.000018之前的所有二进制日志文件)
mysql> purge binary logs to 'mysql-bin.000018';
Query OK, 0 rows affected (0.08 sec)
mysql> show binary logs;
+------------------+-----------+
| Log_name | File_size |
+------------------+-----------+
| mysql-bin.000018 | 117 |
| mysql-bin.000019 | 285300 |
| mysql-bin.000020 | 181229 |
| mysql-bin.000021 | 98 |
+------------------+-----------+
4 rows in set (0.00 sec)
mysql> show binlog events;
+------------------+-----+-------------+-----------+-------------+---------------------------------------+
| Log_name | Pos | Event_type | Server_id | End_log_pos | Info |
+------------------+-----+-------------+-----------+-------------+---------------------------------------+
| mysql-bin.000018 | 4 | Format_desc | 1 | 98 | Server ver: 5.0.45-log, Binlog ver: 4 |
| mysql-bin.000018 | 98 | Stop | 1 | 117 | |
+------------------+-----+-------------+-----------+-------------+---------------------------------------+
2 rows in set (0.01 sec)
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