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";