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)