You can use INFORMATION_SCHEMA.TABLES and AVG_ROW_LENGTH to query average row length in MySQL −
SELECT AVG_ROW_LENGTH FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = ‘yourTableName’;
Let us first create a table −
mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100) ); Query OK, 0 rows affected (0.90 sec)
Insert records in the table using insert command −
mysql> insert into DemoTable(StudentName) values('John');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(StudentName) values('Larry');
Query OK, 1 row affected (0.21 sec)
mysql> insert into DemoTable(StudentName) values('Sam');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(StudentName) values('Mike');
Query OK, 1 row affected (0.15 sec)Display records from the table using select command −
mysql> select *from DemoTable;
This will produce the following output −
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 1 | John | | 2 | Larry | | 3 | Sam | | 4 | Mike | +-----------+-------------+ 4 rows in set (0.00 sec)
Query average row length in MySQL −
mysql> SELECT AVG_ROW_LENGTH FROM information_schema.tables WHERE TABLE_NAME = 'DemoTable';
This will produce the following output −
+----------------+ | AVG_ROW_LENGTH | +----------------+ | 4096 | +----------------+ 1 row in set (0.11 sec)
