MySQL查询数据库表空间大小

一、查询所有数据库占用空间大小

SELECT
  TABLE_SCHEMA,
  CONCAT(
    TRUNCATE(SUM(data_length) / 1024 / 1024, 2),
    ' MB'
  ) AS data_size,
  CONCAT(
    TRUNCATE(SUM(index_length) / 1024 / 1024, 2),
    'MB'
  ) AS index_size
FROM
  information_schema.tables
GROUP BY TABLE_SCHEMA
ORDER BY data_length DESC;

二、查询对应数据库表占用空间大小

SELECT
  TABLE_NAME,
  CONCAT(
    TRUNCATE(data_length / 1024 / 1024, 2),
    ' MB'
  ) AS data_size,
  CONCAT(
    TRUNCATE(index_length / 1024 / 1024, 2),
    ' MB'
  ) AS index_size
FROM
  information_schema.tables
WHERE TABLE_SCHEMA = '数据库名字'
GROUP BY TABLE_NAME
ORDER BY data_length DESC;

三、查询某个数据库对应表占用空间大小

SELECT
  CONCAT(
    ROUND(SUM(DATA_LENGTH / 1024 / 1024), 2),
    'MB'
  ) AS DATA
FROM
  TABLES
WHERE table_schema = '数据库名字'
  AND table_name = '表名字';