[mysql] How to get the sizes of the tables of a MySQL database?

Size of all tables:

Suppose your database or TABLE_SCHEMA name is "news_alert". Then this query will show the size of all tables in the database.

SELECT
  TABLE_NAME AS `Table`,
  ROUND(((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024),2) AS `Size (MB)`
FROM
  information_schema.TABLES
WHERE
  TABLE_SCHEMA = "news_alert"
ORDER BY
  (DATA_LENGTH + INDEX_LENGTH)
DESC;

Output:

    +---------+-----------+
    | Table   | Size (MB) |
    +---------+-----------+
    | news    |      0.08 |
    | keyword |      0.02 |
    +---------+-----------+
    2 rows in set (0.00 sec)

For the specific table:

Suppose your TABLE_NAME is "news". Then SQL query will be-

SELECT
  TABLE_NAME AS `Table`,
  ROUND(((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024),2) AS `Size (MB)`
FROM
  information_schema.TABLES
WHERE
    TABLE_SCHEMA = "news_alert"
  AND
    TABLE_NAME = "news"
ORDER BY
  (DATA_LENGTH + INDEX_LENGTH)
DESC;

Output:

+-------+-----------+
| Table | Size (MB) |
+-------+-----------+
| news  |      0.08 |
+-------+-----------+
1 row in set (0.00 sec)