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(*) from
10、哪些数据库实例在运行
select inst_name from v$active_instances;
