Check out example codes for "big table in mysql". It will help you in understanding the concepts better.

Code Example 1

SELECT table_name AS "Table",
ROUND(((data_length + index_length) / 1024 / 1024), 2) AS "Size (MB)"
FROM information_schema.TABLES
WHERE (data_length + index_length) > 1000000  AND table_schema = "magento" 
ORDER BY (data_length + index_length) DESC;

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