How Can I Determine the Size of My MySQL Database Tables?

Determining the Size of MySQL Database Tables

Getting information about the size of tables in a MySQL database can be beneficial for database management and optimization. One useful query to retrieve such information is:

show table status from myDatabaseName;

However, interpreting the results of this query can be challenging. To identify the tables with the largest sizes, we need to examine the appropriate column.

The column holding the desired information is Data_length, which represents the size of data in the table, not including indexes. While Data_length provides a direct measure of data size, using (Data_length Index_length) can give a more comprehensive view of the total space allocated.

To calculate the size in megabytes, you can use the following query:

SELECT 
    table_name AS `Table`, 
    round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB` 
FROM information_schema.TABLES 
WHERE table_schema = "$DB_NAME";

Alternatively, to list the sizes of all tables across all databases, sorted by size, you can employ the following query:

SELECT 
     table_schema as `Database`, 
     table_name AS `Table`, 
     round(((data_length + index_length) / 1024 / 1024), 2) `Size in MB` 
FROM information_schema.TABLES 
ORDER BY (data_length + index_length) DESC;

By utilizing these queries, you can easily determine the size of tables in your MySQL database and identify those with the highest storage requirements.

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