mysql - 如何获取MySQL数据库表的大小？(How to get the sizes of the tables of a MySQL database?)

Question

I can run this query to get the sizes of all tables in a MySQL database:

(我可以运行此查询来获取MySQL数据库中所有表的大小：)

show table status from myDatabaseName;

I would like some help in understanding the results.

(我想在理解结果方面提供一些帮助。)

I am looking for tables with the largest sizes.

(我正在寻找最大尺寸的桌子。)

Which column should I look at?

(我应该看哪一栏？)

  ask by JPashs translate from so

Answer 1

You can use this query to show the size of a table (although you need to substitute the variables first):

(您可以使用此查询来显示表的大小（尽管您需要先替换变量）：)

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";

or this query to list the size of every table in every database, largest first:

(或者此查询列出每个数据库中每个表的大小，最大的第一个：)

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;