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1. 查看数据大小：

SELECT CONCAT(ROUND(SUM(data_length)/(1024*1024), 2), ' M')  AS 'Total Data Size'  
FROM information_schema.TABLES WHERE table_schema = 'shop'; 

2. 查看索引大小：

    SELECT  CONCAT(ROUND(SUM(index_length)/(1024*1024), 2), ' M')  AS 'Total Index Size'  
    FROM information_schema.TABLES  WHERE table_schema = 'shop';  

3. 综合起来查看总大小:

SELECT  
  CONCAT(table_schema,'.',table_name) AS 'Table Name',  
  table_rows AS 'Number of Rows',  
  CONCAT(ROUND(data_length/(1024*1024), 2), ' M') AS 'Data Size',  
  CONCAT(ROUND(index_length/(1024*1024), 2), ' M') AS 'Index Size',  
  CONCAT(ROUND((data_length+index_length)/(1024*1024), 2), ' M') AS 'Total'  
FROM information_schema.TABLES  
WHERE table_schema = 'shop';