mysql 表空间及索引的查看方法

1.查看索引 

（1）单位是GB 
SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024*1024), 2), ' GB') AS 'Total Index Size' FROM information_schema.TABLES WHERE table_schema LIKE 'database'; 
+------------------+ 
| Total Index Size | 
+------------------+ 
| 1.70 GB | 
+------------------+ 
（2）单位是MB 
SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024), 2), ' MB') AS 'Total Index Size' FROM information_schema.TABLES WHERE table_schema LIKE 'database'; 
其中“database”为你所要查看的数据库 

2.查看表空间 
SELECT CONCAT(ROUND(SUM(data_length)/(1024*1024*1024), 2), ' GB') AS 'Total Data Size' 
FROM information_schema.TABLES WHERE table_schema LIKE 'database'; 
+-----------------+ 
| Total Data Size | 
+-----------------+ 
| 3.01 GB | 
+-----------------+ 

3.查看数据库中所有表的信息 
SELECT CONCAT(table_schema,'.',table_name) AS 'Table Name', 
CONCAT(ROUND(table_rows/1000000,2),'M') AS 'Number of Rows', 
CONCAT(ROUND(data_length/(1024*1024*1024),2),'G') AS 'Data Size', 
CONCAT(ROUND(index_length/(1024*1024*1024),2),'G') AS 'Index Size' , 

CONCAT(ROUND((data_length+index_length)/(1024*1024*1024),2),'G') AS'Total'FROM information_schema.TABLES WHERE table_schema LIKE 'database';