Mysql的binlog日志作用是用来记录mysql内部增删改查等对mysql数据库有更新的内容的记录（对数据库的改动），对数据库的查询select或show等不会被binlog日志记录;主要用于数据库的主从复制以及增量恢复。本文关于binlog的讲解基于ubuntu16.04安装的MySQL 5.7.25 。

配置binlog

在mysql 5.7之后，已经没有my.cnf的模板。具体关于binlog的配置请自行搜索。

配置binlog的主要参数如下：

[mysqld]

server-id = 1

log_bin = mysql-bin

检查binlog是否已经开启

登录mysql后，使用如下命令：

mysql> show variables like '%log_bin%';

结果如下:

+---------------------------------+--------------------------------+
| Variable_name                   | Value                          |
+---------------------------------+--------------------------------+
| log_bin                         | ON                             |
| log_bin_basename                | /var/lib/mysql/mysql-bin       |
| log_bin_index                   | /var/lib/mysql/mysql-bin.index |
| log_bin_trust_function_creators | OFF                            |
| log_bin_use_v1_row_events       | OFF                            |
| sql_log_bin                     | ON                             |
+---------------------------------+--------------------------------+
6 rows in set (0.01 sec)

查看binlog名称

查看binlog名称的命令如下：

mysql> show binary logs;

结果如下：

+------------------+-----------+

| Log_name         | File_size |

+------------------+-----------+

| mysql-bin.000001 |       177 |

| mysql-bin.000002 |       462 |

+------------------+-----------+

2 rows in set (0.00 sec)

查看binlog具体内容

查看binlog具体内容的命令如下：

mysql> show binlog events in 'mysql-bin.000001';

结果如下：

+------------------+-----+----------------+-----------+-------------+---------------------------------------+

| Log\_name         | Pos | Event\_type     | Server\_id | End\_log\_pos | Info                                  |

+------------------+-----+----------------+-----------+-------------+---------------------------------------+

| mysql-bin.000001 |   4 | Format\_desc    |         1 |         123 | Server ver: 5.7.25-log, Binlog ver: 4 |

| mysql-bin.000001 | 123 | Previous\_gtids |         1 |         154 |                                       |

| mysql-bin.000001 | 154 | Stop           |         1 |         177 |                                       |

+------------------+-----+----------------+-----------+-------------+---------------------------------------+

3 rows in set (0.00 sec)