mysql 查看sql_log_bin_关于 MySQL sql_log_bin

sql_log_bin表示当前会话是否记录 bin log，默认值on。

打开和关闭sql_log_bin:

SET sql_log_bin = {OFF|ON}

当sql_log_bin关闭后，主库服务器上的改动不记录bin log，不会复制到从库。

全局的sql_log_bin是只读的，不能修改。

如果是基于GTID复制，当关闭sql_log_bin后，任何修改，不会有GTID，也不会记录到bin log。

下面做下测试：

首先查看log file, log pos， 以及 gtid set:

>show master status;

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

| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

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

| mysql-bin.000055 | 1206 | | |a027439b-1d81-11ea-8d1f-002226a4a516:1-118441|

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

1 row in set (0.00 sec)

接着，关闭sql_log_bin:

>set sql_log_bin=off;

Query OK, 0 rows affected (0.00 sec)

>select @@sql_log_bin;

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

| @@sql_log_bin |

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

| 0 |

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

1 row in set (0.00 sec)

插入新数据：

> insert into xxxxx

再次查看log file, log pos， 以及 gtid set:

>show master status;

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

| File | Position | Binlog_Do_DB | Binlog_Ignore_DB | Executed_Gtid_Set |

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

| mysql-bin.000055 | 1206 | | |a027439b-1d81-11ea-8d1f-002226a4a516:1-118441|

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

1 row in set (0.00 sec)

可以看到，当关闭sql_log_bin后，如果插入新数据，bin log和gtid set都没有变化。

参考