How to Determine Session Status in MySQL

In MySQL server we determine the physical/logical I/O with the help of a query. The MySQL server maintains many status variables that provideinformation about its operation.

mysql> FLUSH STATUS;         // -- In newer MySQLs, this clears the "SESSION" values //


mysql> SHOW SESSION STATUS LIKE 'Handler%';



Here, we show a table already create in  my database.
mysql> SELECT * FROM person;



mysql> SHOW SESSION STATUS LIKE 'Handler%';
                                                                                     
 

mysql> SHOW STATUS LIKE 'Up%';




Alas, the InnoDB STATUSes are global. So we need to capture them before and after.
Worse yet, other queries will be bumping the values, too.

mysql> SHOW SESSION STATUS LIKE 'Innodb_buffer_pool%';



mysql> SHOW STATUS LIKE 'Innodb_buffer_pool%';

Resources 

Here are some useful related resources:

• Session Variables as Objects
• Approximate Joins in MySQL Server
• Subqueries in MySQL
• Functions in MySQL
• ORDER BY in MySQL