查看每个数据库所占磁盘大小

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SELECT
  TABLE_SCHEMA AS "库名",
  TRUNCATE(SUM(`DATA_LENGTH`) / 1024 / 1024, 2) AS "表所占空间（MB）",
  TRUNCATE(SUM(`INDEX_LENGTH`) / 1024 / 1024, 2) AS "索引所占空间（MB）",
  TRUNCATE((SUM(`DATA_LENGTH`) + SUM(`INDEX_LENGTH`)) / 1024 / 1024,2) AS "空间累计（MB）"
FROM
  information_schema.`TABLES`
GROUP BY `TABLE_SCHEMA`;

查看某个数据库各表所占磁盘大小

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SELECT
    TABLE_NAME,
    TRUNCATE (DATA_LENGTH / 1024 / 1024, 2) AS "DATA_SIZE(MB)",
    TRUNCATE (INDEX_LENGTH / 1024 / 1024, 2) AS "INDEX_SIZE(MB)"
FROM INFORMATION_SCHEMA. TABLES
WHERE TABLE_SCHEMA = 'db_name'
GROUP BY TABLE_NAME
ORDER BY DATA_LENGTH DESC;

参考链接

mysql查看每个数据库所占磁盘大小