ORACLE常用命令总结-查看数据库的SQL

1、查看表空间的名称及大小

selectt.tablespace_name,round(sum(bytes/(1024*1024)),0)ts_size
fromdba_tablespacest,dba_data_filesd
wheret.tablespace_name=d.tablespace_name
groupbyt.tablespace_name;

2、查看表空间物理文件的名称及大小

selecttablespace_name,file_id,file_name,
round(bytes/(1024*1024),0)total_space
fromdba_data_files
orderbytablespace_name;

3、查看回滚段名称及大小

selectsegment_name,tablespace_name,r.status,
(initial_extent/1024)InitialExtent,(next_extent/1024)NextExtent,
max_extents,v.curextCurExtent
Fromdba_rollback_segsr,v$rollstatv
Wherer.segment_id=v.usn(+)
orderbysegment_name;

4、查看控制文件

selectnamefromv$controlfile;

5、查看日志文件

selectmemberfromv$logfile;

6、查看表空间的使用情况

selectsum(bytes)/(1024*1024)asfree_space,tablespace_name
fromdba_free_space
groupbytablespace_name;

SELECTA.TABLESPACE_NAME,A.BYTESTOTAL,B.BYTESUSED,C.BYTESFREE,
(B.BYTES*100)/A.BYTES"%USED",(C.BYTES*100)/A.BYTES"%FREE"
FROMSYS.SM$TS_AVAILA,SYS.SM$TS_USEDB,SYS.SM$TS_FREEC
WHEREA.TABLESPACE_NAME=B.TABLESPACE_NAMEANDA.TABLESPACE_NAME=C.TABLESPACE_NAME;

7、查看数据库库对象

selectowner,object_type,status,count(*)count#fromall_objectsgroupbyowner,object_type,status;

8、查看数据库的版本

SelectversionFROMProduct_component_version
WhereSUBSTR(PRODUCT,1,6)='Oracle';

9、查看数据库的创建日期和归档方式

SelectCreated,Log_Mode,Log_ModeFromV$Database;