查看oracle数据库信息的SQL语句

通过以下SQL可以查看数据的各种信息 ；

1、查看表空间的名称及大小

select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size 

from dba_tablespaces t, dba_data_files d 

where t.tablespace_name = d.tablespace_name 

group by t.tablespace_name;

2、查看表空间物理文件的名称及大小

select tablespace_name, file_id, file_name, 

round(bytes/(1024*1024),0) total_space 

from dba_data_files 

order by tablespace_name;

3、查看回滚段名称及大小

select segment_name, tablespace_name, r.status, 

(initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent, 

max_extents, v.curext CurExtent 

From dba_rollback_segs r, v$rollstat v 

Where r.segment_id = v.usn(+) 

order by segment_name ;

4、查看控制文件

select name from v$controlfile;

5、查看日志文件

select member from v$logfile;

6、查看表空间的使用情况

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;

7、查看数据库库对象

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

8、查看数据库的版本

Select version FROM Product_component_version 

Where SUBSTR(PRODUCT,1,6)='Oracle';

9、查看数据库的创建日期和归档方式

Select Created, Log_Mode, Log_Mode From V$Database;