How to determine the size of MySQL databases and tables

This article demonstrates how to determine MySQL database size and MySQL table size. You can do this by using the phpMyAdmin web interface or by using the command line.

USING THE COMMAND LINE

You can use the mysql command-line program to determine the sizes of MySQL databases and tables. To do this, follow these steps:

1. Log in to your account using SSH.
2. At the command line, type the following command, replacing username with your A2 Hosting account username:

   mysql -u username -p

3. At the Enter Password prompt, type your password. When you type the correct password, the mysql> prompt appears.

4. To determine the sizes of all of your databases, at the mysql> prompt type the following command:
   

   SELECT table_schema AS "Database",
   ROUND(SUM(data_length + index_length) / 1024 / 1024, 2) AS "Size (MB)"
   FROM information_schema.TABLES
   GROUP BY table_schema;

   Depending on how many databases you have and how large they are, this command may take a minute or two to complete. After the command finishes, it displays a list of all of your databases and their corresponding size (in megabytes).

5. To determine the sizes of all of the tables in a specific database, at the mysql> prompt, type the following command. Replace database_name with the name of the database that you want to check:
   

   SELECT table_name AS "Table",
   ROUND(((data_length + index_length) / 1024 / 1024), 2) AS "Size (MB)"
   FROM information_schema.TABLES
   WHERE table_schema = "database_name"
   ORDER BY (data_length + index_length) DESC;

   After the command finishes, it displays a list of all of the tables and their corresponding size (in megabytes), with the largest table at the top and smallest table at the bottom.