How Can I Determine the Sizes of MySQL Tables and Identify the Largest Ones?

Determining the Sizes of MySQL Tables

In order to assess the storage requirements of a MySQL database, it is crucial to understand the sizes of its individual tables. While the query show table status from myDatabaseName; provides a comprehensive list of table information, identifying the tables with the largest sizes requires further analysis.

To determine the size of a specific table, a more specific query can be employed:

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

In this query, the following columns are of interest:

• table_name: This is the name of the table.
• Size in MB: This column provides the table's size in megabytes, accounting for both data and index sizes.

For a comprehensive overview of table sizes across all databases, this query can be utilized:

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;

This query orders the tables in descending order based on their total sizes, making it easy to identify the largest tables in the system.

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