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前言：
通过后面文章学习，咱们晓得 binlog 会记录数据库所有执行的 DDL 和 DML 语句（除了数据查问语句 select、show 等）。留神默认状况下会记录所有库的操作，那么如果咱们有另类需要，比如说只让某个库记录 binglog 或排除某个库记录 binlog，是否反对此类需要呢？本篇文章咱们一起来看下。
1. binlog_do_db 与 binlog_ignore_db
当数据库实例开启 binlog 时，咱们执行 show master status 命令，会看到有 Binlog_Do_DB 与 Binlog_Ignore_DB 选项。
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000009 | 282838 | | | |
+---------------+----------+--------------+------------------+-------------------+默认状况下，这两个选项为空，那么这两个参数有何作用？是否如同其字面意思一个只让某个库记录 binglog 一个排除某个库记录 binlog 呢？笔者查阅官网文档，简略阐明下这两个参数的作用：
- binlog_do_db：此参数示意只记录指定数据库的二进制日志，默认全副记录。
- binlog_ignore_db：此参数示意不记录指定的数据库的二进制日志。
这两个参数为互斥关系，个别只抉择其一设置，只能在启动命令行中或配置文件中退出。指定多个数据库要分行写入，举例如下：
# 指定 db1 db2 记录 binlog
[mysqld]
binlog_do_db = db1
binlog_do_db = db2
# 不让 db3 db4 记录 binlog
[mysqld]
binlog_ignore_db = db3
binlog_ignore_db = db4此外，这二者参数具体作用与否还与 binlog 格局有关系，在某些状况下 binlog 格局设置为 STATEMENT 或 ROW 会有不同的成果。在理论利用中 binlog_ignore_db 用处更宽泛些，比如说某个库的数据不太重要，为了加重服务器写入压力，咱们可能不让该库记录 binlog。网上也有文章说设置 binlog_ignore_db 会导致从库同步谬误，那么设置该参数到底有什么成果呢，上面咱们来具体试验下。
2. binlog_ignore_db 具体成果
首先阐明下，我的测试数据库实例是 5.7.23 社区版本，共有 testdb、logdb 两个业务库，咱们设置 logdb 不记录 binlog，上面来具体试验下：
# binlog 为 ROW 格局
# 1. 不应用 use db
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 154 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
mysql> select database();
+------------+
| database() |
+------------+
| NULL |
+------------+
1 row in set (0.00 sec)
mysql> CREATE TABLE testdb.`test_tb1` (id int , name varchar(30) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.06 sec)
mysql> insert into testdb.test_tb1 values (1001,'sdfde');
Query OK, 1 row affected (0.01 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 653 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> CREATE TABLE logdb.`log_tb1` (id int , name varchar(30) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.05 sec)
mysql> insert into logdb.log_tb1 values (1001,'sdfde');
Query OK, 1 row affected (0.00 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 883 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
mysql> insert into logdb.log_tb1 values (1002,'sdsdfde');
Query OK, 1 row affected (0.01 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 883 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
mysql> alter table logdb.log_tb1 add column c3 varchar(20);
Query OK, 0 rows affected (0.12 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 1070 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
# 论断：其余库记录失常 logdb 库会记录 DDL 不记录 DML
# 2. 应用 use testdb 跨库
mysql> use testdb;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select database();
+------------+
| database() |
+------------+
| testdb |
+------------+
1 row in set (0.00 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 1070 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> CREATE TABLE `test_tb2` (id int , name varchar(30) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.05 sec)
mysql> insert into test_tb2 values (1001,'sdfde');
Query OK, 1 row affected (0.04 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 1574 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> CREATE TABLE logdb.`log_tb2` (id int , name varchar(30) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.05 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 1810 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> insert into logdb.log_tb2 values (1001,'sdfde');
Query OK, 1 row affected (0.01 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 1810 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
# 论断：同样 logdb 库会记录 DDL 不记录 DML
# 3. 应用 use logdb 跨库
mysql> use logdb;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select database();
+------------+
| database() |
+------------+
| logdb |
+------------+
1 row in set (0.00 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 1810 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> CREATE TABLE testdb.`test_tb3` (id int , name varchar(30) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.23 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 1810 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> insert into testdb.test_tb3 values (1001,'sdfde');
Query OK, 1 row affected (0.02 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 2081 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> CREATE TABLE `log_tb3` (id int , name varchar(30) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.05 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 2081 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> insert into log_tb3 values (1001,'sdfde');
Query OK, 1 row affected (0.02 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 2081 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
# 论断：logdb 都不记录 同时不记录其余库的 DDL
# 4. 每次操作都进入此库 不跨库
mysql> use testdb;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 2081 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> CREATE TABLE `test_tb4` (id int , name varchar(30) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.05 sec)
mysql> insert into test_tb4 values (1001,'sdfde');
Query OK, 1 row affected (0.01 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 2585 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> use logdb;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> CREATE TABLE `log_tb4` (id int , name varchar(30) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.04 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 2585 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
mysql> insert into log_tb4 values (1001,'sdfde');
Query OK, 1 row affected (0.01 sec)
mysql> show master status;
+---------------+----------+--------------+------------------+-------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |
+---------------+----------+--------------+------------------+-------------------+
| binlog.000011 | 2585 | | logdb | |
+---------------+----------+--------------+------------------+-------------------+
1 row in set (0.00 sec)
# 论断：其余库全副记录 logdb 全不记录 同样的，将 binlog 格局设置为 STATEMENT，再次进行测试，这里不再赘述测试过程，总结下 STATEMENT 格局下的试验后果：
- 未抉择任何数据库进行操作，所有都会记录。
- 抉择 testdb，对 testdb 和 logdb 别离进行操作，所有库都会记录。
- 抉择 logdb，对 testdb 和 logdb 别离进行操作，所有库都不会记录。
- 抉择某个库并只对以后库进行操作，则记录失常，不会记录 logdb。
看了这么多试验数据，你是否目迷五色了呢，上面咱们以思维导图的模式总结如下：
这么看来 binlog_ignore_db 参数的成果的确和诸多因素无关，特地是有从库的状况下，主库要特地小心应用此参数，很容易产生主从同步谬误。不过，依照严格规范只对以后数据库进行操作，则不会产生问题。这也通知咱们要严格依照规范来，只赋予业务账号某个单库的权限，也能防止各种问题产生。
总结：
不分明各位读者是否对这种介绍参数的文章感兴趣呢？可能这些是数据库运维人员比拟关注的吧。本篇文章次要介绍对于 binlog 的 binlog_ignore_db 参数的具体作用，可能本篇文章试验环境还不够思考周全，有趣味的同学能够参考下官网文档，有助于对该参数有更深刻的理解。
正文完
