可以使用下面的MySQL命令来确定

SELECT table_schema AS "Database", SUM(data_length + index_length) / 1024 / 1024 AS "Size (MB)" FROM information_schema.TABLES GROUP BY table_schema

结果

Database    Size (MB)
db1         11.75678253
db2         9.53125000
test        50.78547382

以GB为单位获取结果

SELECT table_schema AS "Database", SUM(data_length + index_length) / 1024 / 1024 / 1024 AS "Size (GB)" FROM information_schema.TABLES GROUP BY table_schema

要获得以MB为单位的结果:

SELECT
SUM(ROUND(((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024), 2)) AS "SIZE IN MB"
FROM INFORMATION_SCHEMA.TABLES
WHERE
TABLE_SCHEMA = "SCHEMA-NAME";

要获得GB的结果:

SELECT
SUM(ROUND(((DATA_LENGTH + INDEX_LENGTH) / 1024 / 1024 / 1024), 2)) AS "SIZE IN GB"
FROM INFORMATION_SCHEMA.TABLES
WHERE
TABLE_SCHEMA = "SCHEMA-NAME";

或者，如果使用phpMyAdmin，可以在数据库结构选项卡的页脚中查看表大小的总和。实际的数据库大小可能略大于这个大小，但它似乎与上面提到的table_schema方法一致。

的截图:

另外:如果有人想获取单个表的大小，请使用以下代码:

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

注意:它不会显示使用ROUND()方法的分数。

希望这能对我们中的许多人有所帮助。

可以使用下面的MySQL命令来确定

SELECT table_schema AS "Database", SUM(data_length + index_length) / 1024 / 1024 AS "Size (MB)" FROM information_schema.TABLES GROUP BY table_schema

结果

Database    Size (MB)
db1         11.75678253
db2         9.53125000
test        50.78547382

以GB为单位获取结果

SELECT table_schema AS "Database", SUM(data_length + index_length) / 1024 / 1024 / 1024 AS "Size (GB)" FROM information_schema.TABLES GROUP BY table_schema

或者，您可以直接跳转到数据目录并检查v3的组合大小。myd, v3。Myi和v3。FRM文件(用于myisam)或v3。Idb & v3.frm(用于innodb)。