MySQL - [07] 查看库表数据所使用的空间大小

1、切换数据库：use information_schema;

2、查看数据库使用大小

SELECT
    concat(round(sum(data_length/1024/1024),2),'MB') as data 
FROM
    information_schema.tables 
WHERE
    table_schema='DB_Name';

3、查看表使用大小

SELECT 
    concat(ROUND(SUM(data_length / 1024 / 1024), 2), 'MB') AS data
FROM
    information_schema.tables
WHERE
    table_schema = 'DB_Name'
AND
    table_name = 'Table_Name';

4、查看指定数据库各表容量大小

SELECT
    table_schema AS '数据库', table_name AS '表名', table_rows AS '记录数',
    TRUNCATE(data_length / 1024 / 1024, 2) AS '数据容量(MB)',
    TRUNCATE(index_length / 1024 / 1024, 2) AS '索引容量(MB)'
FROM
    information_schema.tables
WHERE
    table_schema = 'DB_Name'
ORDER BY
    data_length DESC,
    index_length DESC;

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