Get the average row length of a MySQL table

MySQL MySQLi Database

In order to get the average row length of a table in MySQL, you can use INFORMATION_SCHEMA.TABLES. Let us first create a table. Following is the query −

mysql> create table Client_information
   -> (
   -> Id int,
   -> Name varchar(10)
   -> );
Query OK, 0 rows affected (0.48 sec)

Following is the query to insert some records in the table using insert command −

mysql> insert into Client_information values(1,'Larry');
Query OK, 1 row affected (0.14 sec)

mysql> insert into Client_information values(2,'Mike');
Query OK, 1 row affected (0.17 sec)

mysql> insert into Client_information values(3,'Sam');
Query OK, 1 row affected (0.19 sec)

Following is the query to display all records from the table using a select statement −

mysql> select *from Client_information;

This will produce the following output −

+------+-------+
| Id   | Name  |
+------+-------+
| 1    | Larry |
| 2    | Mike  |
| 3    | Sam   |
+------+-------+
3 rows in set (0.00 sec)

Following is the query to get the average row length −

mysql> select *from information_schema.tables where table_name='Client_information';

Following is the output showing the average row length from “AVG_ROW_LENGTH” −

+---------------+--------------+--------------------+------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+---------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------------+
| TABLE_CATALOG | TABLE_SCHEMA | TABLE_NAME         | TABLE_TYPE | ENGINE |VERSION  | ROW_FORMAT | TABLE_ROWS | AVG_ROW_LENGTH | DATA_LENGTH |MAX_DATA_LENGTH  | INDEX_LENGTH | DATA_FREE | AUTO_INCREMENT | CREATE_TIME | UPDATE_TIME | CHECK_TIME | TABLE_COLLATION | CHECKSUM | CREATE_OPTIONS | TABLE_COMMENT |
+---------------+--------------+--------------------+------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+---------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------------+
| def           | sample       | client_information | BASE TABLE | InnoDB | 10      | Dynamic    | 4          | 4096           | 16384       | 0               | 0            | 0         | NULL | 2019-03-11 20:02:40 | NULL | NULL | utf8_general_ci | NULL | | |
| def           | test         | client_information | BASE TABLE | InnoDB | 10      | Dynamic    | 3          | 5461           | 16384       | 0               | 0            | 0         | NULL | 2019-04-03 02:28:31 | 2019-04-03 02:29:00 | NULL | utf8mb4_0900_ai_ci | NULL | | |
+---------------+--------------+--------------------+------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+---------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------------+
2 rows in set (0.13 sec)

Smita Kapse

Updated on: 30-Jul-2019

121 Views

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