ORACLE常用的维护语句

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select * from v$version;

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 order by TABLESPACE_NAME ;

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 order by tablespace_name ;


2、查看表空间物理文件的名称及大小，是否自扩展

select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
order by file_name;

select FILE_NAME,STATUS,AUTOEXTENSIBLE,round(MAXBYTES/1024/1024) mb,
INCREMENT_BY "Incre"
from dba_data_files
order by 3;



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;

set pagesize 1000 linesize 150
col file_name for a50
SELECT a.TABLESPACE_NAME,a.FILE_NAME,a.bytes/(1024*1024) "TOTAL Mb",b.bytes/(1024*1024) "USED Mb",to_char((b.bytes*100)/a.bytes, '99.9' )"%USED" FROM DBA_DATA_FILES a, SYS.SM$TS_USED b WHERE a.tablespace_name = b.tablespace_name order by 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;

10、如何远程判断Oracle数据库的安装平台

select * from v$version;

11、查看数据表的参数信息