${database} 為資料庫的名稱/*1.檢視索引

（1）單位是GB*/ 

SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024*1024), 6), ' GB') AS 'Total Index Size' 
FROM information_schema.TABLES WHERE table_schema LIKE '${database}'; 
/*
+------------------+ 
| Total Index Size | 
+------------------+ 
| 1.70 GB | 
+------------------+
*/
/*
（2）單位是MB
*/
SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024), 6), ' MB') AS 'Total Index Size' 
FROM information_schema.TABLES WHERE table_schema LIKE '${database}';
/*
   其中“database”為你所要檢視的資料庫
*/
 
/*
2.查看錶空間
*/
SELECT CONCAT(ROUND(SUM(data_length)/(1024*1024*1024), 6), ' GB') AS 'Total Data Size' 
FROM information_schema.TABLES WHERE table_schema LIKE '${database}'; 
/*
+-----------------+ 
| Total Data Size | 
+-----------------+ 
| 3.01 GB | 
+-----------------+
*/
/*
3.檢視資料庫中所有表的資訊
*/
SELECT CONCAT(table_schema,'.',table_name) AS 'Table Name', 
    table_rows AS 'Number of Rows', 
    CONCAT(ROUND(data_length/(1024*1024*1024),6),' G') AS 'Data Size', 
    CONCAT(ROUND(index_length/(1024*1024*1024),6),' G') AS 'Index Size' , 
    CONCAT(ROUND((data_length+index_length)/(1024*1024*1024),6),' G') AS'Total'
FROM information_schema.TABLES 
WHERE table_schema LIKE '${database}';