MySQL 参数文件及参数
查看参数可以使用show variables like "variables_name" select @@session.variables_name select @@global.variables_name
如查看read_buffer_size
mysql> set read_buffer_size=524288;
Query OK, 0 rows affected (0.07 sec)
mysql> select @@session.read_buffer_size;
+----------------------------+
| @@session.read_buffer_size |
+----------------------------+
| 524288 |
+----------------------------+
1 row in set (0.00 sec)
mysql> select @@global.read_buffer_size;
+---------------------------+
| @@global.read_buffer_size |
+---------------------------+
| 131072 |
+---------------------------+
1 row in set (0.00 sec)
mysql> show variables like "read_buffer_size%";
+------------------+--------+
| Variable_name | Value|
+------------------+--------+
| read_buffer_size | 524288 |
+------------------+--------+
1 row in set (0.00 sec)
可以看到同样设置了read_buffer_size但是session和global却不一样 因为我设置的时候没有加global
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