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

Determining the Sizes of Tables in a MySQL Database

Understanding the sizes of tables within a MySQL database is crucial for optimization and capacity planning. One common approach to obtain this information is by running the following query:

show table status from myDatabaseName;

However, this query does not provide a direct indication of the table sizes. To determine which column provides the relevant data, we turn to the column named Data_length. This column represents the size of the table data, not including any indices.

Alternately, for a more comprehensive view, users can employ the following queries:

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";

This query calculates the total size of a table, including both data and indices. To obtain the sizes of all tables in a database, users can use this 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;

This query presents a list of all tables in all databases, arranged in descending order of size. By using this query, users can easily identify the largest tables in their database environment.

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