1.检察表空间运用景象：

select sum(bytes)/(1024*1024) as free_space,tablespace_name   from dba_free_space  

group by tablespace_name;

SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,  (B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE" FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE C  

WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME;

2、检察数据库库对象

select owner, object_type, status, count(*) count# from all_objects group by owner, object_type, status;  

3、检察数据库的版本

Select version FROM Product_component_version   Where SUBSTR(PRODUCT,1,6)="Oracle";  

4、检察数据库建坐日期战归档体例

Select Created, Log_Mode, Log_Mode From V$Database;  

5、查询数据库中索引占用表空间的大小

select a.segment_name,a.tablespace_name,b.table_name,a.bytes/1024/1024 mbytes,a.blocks  

from user_segments a, user_indexes b  

where a.segment_name = b.index_name  

and a.segment_type = "INDEX" --索引

and a.tablespace_name="APPINDEX" --表空间

and b.table_name like "%PREP%" --索引地点表

order by table_name,a.bytes/1024/1024 desc