常用sql语句_常用经典sql语句

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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、删除表空间的数据文件：Alter tablespace tablespace_name

Drop datafile file_name;

3、删除表空间:Drop tablespace tablespace_name

[Including contents [And datafiles]]

4、删除表：Drop table table_name[cascade constraints][purge];

4、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;

5、看控制文件

select name from v$controlfile;

6、看日志文件

select member from v$logfile;

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、找object为哪些进程所用

select

p.spid,s.sid,s.serial# serial_num,s.username user_name,a.typeobject_type,s.osuser os_user_name,a.owner,a.object object_name,decode(sign(48-command),9、object分类数量

select decode(o.type#,1,'INDEX' , 2,'TABLE' , 3 , 'CLUSTER' , 4, 'VIEW' , 5 ,'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER')object_type , count(*)quantity fromsys.obj$ o where o.type# > 1 group by decode(o.type#,1,'INDEX' , 2,'TABLE' , 3, 'CLUSTER' , 4, 'VIEW' , 5 , 'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER')union select'COLUMN' , count(*)

from sys.col$ union select 'DB LINK' , count(*)from10、哪些数据库实例在运行

select inst_name from v$active_instances;