mysql tips

While testing of mysql using sysbench I wanted to ensure that sysbench client is using SSL connection. For this  performance_schema came handy.

mysql> SELECT CONNECTION_TYPE from performance_schema.threads where processlist_command='Query';
+-----------------+
| CONNECTION_TYPE |
+-----------------+
| SSL/TLS         |
+-----------------+


mysql> desc performance_schema.threads ;
+---------------------+---------------------+------+-----+---------+-------+
| Field               | Type                | Null | Key | Default | Extra |
+---------------------+---------------------+------+-----+---------+-------+
| THREAD_ID           | bigint(20) unsigned | NO   | PRI | NULL    |       |
| NAME                | varchar(128)        | NO   | MUL | NULL    |       |
| TYPE                | varchar(10)         | NO   |     | NULL    |       |
| PROCESSLIST_ID      | bigint(20) unsigned | YES  | MUL | NULL    |       |
| PROCESSLIST_USER    | varchar(32)         | YES  | MUL | NULL    |       |
| PROCESSLIST_HOST    | varchar(60)         | YES  | MUL | NULL    |       |
| PROCESSLIST_DB      | varchar(64)         | YES  |     | NULL    |       |
| PROCESSLIST_COMMAND | varchar(16)         | YES  |     | NULL    |       |
| PROCESSLIST_TIME    | bigint(20)          | YES  |     | NULL    |       |
| PROCESSLIST_STATE   | varchar(64)         | YES  |     | NULL    |       |
| PROCESSLIST_INFO    | longtext            | YES  |     | NULL    |       |
| PARENT_THREAD_ID    | bigint(20) unsigned | YES  |     | NULL    |       |
| ROLE                | varchar(64)         | YES  |     | NULL    |       |
| INSTRUMENTED        | enum('YES','NO')    | NO   |     | NULL    |       |
| HISTORY             | enum('YES','NO')    | NO   |     | NULL    |       |
| CONNECTION_TYPE     | varchar(16)         | YES  |     | NULL    |       |
| THREAD_OS_ID        | bigint(20) unsigned | YES  | MUL | NULL    |       |
| RESOURCE_GROUP      | varchar(64)         | YES  | MUL | NULL    |       |
+---------------------+---------------------+------+-----+---------+-------+
18 rows in set (0.08 sec)

mysql>


So, if you are using TCP or Socket, using CONNECTION_TYPE column data of table  performance_schema.threads we can find what's being used for connection.




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