oracle中非常有用的查询语句

--表空间使用率

select df.tablespace_name,

round(df.bytes / (1024 * 1024), 2) 总空间 ,

round(sum(fs.bytes) / (1024 * 1024), 2) 剩余空间 ,

round(sum(fs.bytes) * 100 / df.bytes) 剩余百分比,

round((df.bytes - sum(fs.bytes)) * 100 / df.bytes) 使用百分比

from dba_free_space fs,

(select tablespace_name, sum(bytes) bytes

from dba_data_files

group by tablespace_name) df

where fs.tablespace_name = df.tablespace_name

group by df.tablespace_name, df.bytes

order by tablespace_name;

--表所占空间大小

select OWNER, t.segment_name,t.tablespace_name, t.segment_type, sum(t.bytes / 1024 / 1024) mmm

from dba_segments t

where t.owner = 'TEST'

and t.segment_name like '%TEST%'

AND T.tablespace_name='TEST'

and t.segment_type in ('TABLE','TABLE PARTITION')

group by OWNER, t.segment_name,t.tablespace_name, t.segment_type

--HAVING sum(t.bytes / 1024 / 1024)>100

order by mmm desc;

--查看分区表分区大小

select OWNER,t.segment_name, t.partition_name,t.tablespace_name, t.segment_type, sum(t.bytes / 1024 / 1024) mmm

from dba_segments t

where t.owner = 'TEST'

-- and t.segment_name like '%TEST%'

-- AND T.tablespace_name='TEST'

and t.segment_type in ('TABLE','TABLE PARTITION')

group by OWNER,t.segment_name ,t.partition_name,t.tablespace_name, t.segment_type

--HAVING sum(t.bytes / 1024 / 1024)>100

order by mmm desc;

--索引及占空间大小

select t.OWNER, t.segment_name,b.table_name,c.column_name,t.tablespace_name, t.segment_type, sum(t.bytes / 1024 / 1024) mmm

from dba_segments t,dba_indexes b ,Dba_Ind_Columns c

where t.owner = 'TEST'

-- and t.segment_name like '%TEST%'

AND T.tablespace_name='TEST'

and t.segment_type not in ('TABLE','TABLE PARTITION')

and t.segment_name=b.index_name

and b.index_name =c.index_name

group by t.OWNER, t.segment_name,b.table_name,c.column_name,t.tablespace_name, t.segment_type

-- HAVING sum(t.bytes / 1024 / 1024)>100

order by mmm desc;

--查看阻塞

select c.username,a.sid,c.serial#,' is blocking ',d.username,b.sid,d.serial#

from

(select sid,id1,id2 from v$lock where block =1) a,

(select sid,id1,id2 from v$lock where request > 0) b,

(select sid,serial#,username from gv$session ) c,

(select sid,serial#,username from gv$session ) d

where a.id1=b.id1

and a.id2=b.id2

and a.sid=c.sid

and b.sid=d.sid;

--查看oracle锁表

select distinct

a.object_name 被锁表名,

b.ORACLE_USERNAME 数据库用户名,

b.OS_USER_NAME 操作系统用户名,

b.LOCKED_MODE 锁机制,

d.TYPE,

c.SID,

c.SERIAL#,

c.MACHINE 机器,

c.PROGRAM 应用程序,

to_char(c.LOGON_TIME,'yyyymmddhh24miss') 登陆时间,

c.COMMAND 命令,

c.LOCKWAIT 锁等待,

c.SQL_ADDRESS sql语句,

d.CTIME 被锁时间

from dba_objects a, v$locked_object b, v$session c,v$lock d

where a.object_id = b.OBJECT_ID

and b.SESSION_ID= c.SID

and c.SID=d.SID

and d.CTIME>3;

--查看触发器和索引是否有失效

select * from dba_indexes a where a.owner='TEST' and a.status<>'VALID';

select * from dba_triggers a where a.owner='TEST' and a.status<>'ENABLED';