MySQL數據庫表空間及索引的查看

本文我們介紹MySQL數據庫表空間和索引的查看方法，並詳細地給出了其代碼，接下來我們一一介紹。

1.查看索引

（1）單位是GB

    SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024*1024), 2), ' GB')   
     
    AS 'Total Index Size'  

 

+------------------+

| Total Index Size |

+------------------+

| 1.70 GB |

+------------------+

（2）單位是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”為你所要查看的數據庫。

2.查看表空間

    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.查看數據庫中所有表的信息

    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';