How Can I Efficiently Determine and Manage MySQL Table Sizes?

Determining Table Sizes in MySQL Databases

Retrieving the sizes of tables in a MySQL database is a valuable task for optimizing performance and managing storage. The provided query, "show table status from myDatabaseName;", offers a comprehensive view of table information, but understanding the relevant columns for size determination requires further clarification.

To find the tables with the largest sizes, focus on the "Data_length" and "Index_length" columns. The "Data_length" represents the size of the actual data stored in the rows, excluding indexes. The "Index_length" indicates the size of any indexes created on the table.

For a more comprehensive analysis, consider using the following query to calculate the size of a specific table in megabytes:

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";

To list the size of every table in every database, sorted by largest first, 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;

By using these queries, you can effectively identify and manage the tables that consume the most space in your MySQL database.

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