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、查看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;

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;

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、捕捉运行很久的SQL

column username format a12

column opname format a16

column progress format a8

select username,sid,opname,

       round(sofar*100 / totalwork,0) || '%' as progress,

       time_remaining,sql_text

from v$session_longops , v$sql

where time_remaining <> 0

and sql_address = address

and sql_hash_value = hash_value

/

11。查看数据表的参数信息

SELECT   partition_name, high_value, high_value_length, tablespace_name,
         pct_free, pct_used, ini_trans, max_trans, initial_extent,
         next_extent, min_extent, max_extent, pct_increase, FREELISTS,
         freelist_groups, LOGGING, BUFFER_POOL, num_rows, blocks,
         empty_blocks, avg_space, chain_cnt, avg_row_len, sample_size,
         last_analyzed
    FROM dba_tab_partitions
   --WHERE table_name = :tname AND table_owner = :towner
ORDER BY partition_position

12.查看还没提交的事务

select * from v$locked_object;

select * from v$transaction;

13。查找object为哪些进程所用

select
p.spid,
s.sid,
s.serial# serial_num,
s.username user_name,
a.type  object_type,
s.osuser os_user_name,
a.owner,
a.object object_name,
decode(sign(48 - command),
1,
to_char(command), 'Action Code #' || to_char(command) ) action,
p.program oracle_process,
s.terminal terminal,
s.program program,
s.status session_status  
from v$session s, v$access a, v$process p  
where s.paddr = p.addr and
      s.type = 'USER' and    
      a.sid = s.sid   and
   a.object='SUBSCRIBER_ATTR'
order by s.username, s.osuser

14。回滚段查看

select rownum, sys.dba_rollback_segs.segment_name Name, v$rollstat.extents
Extents, v$rollstat.rssize Size_in_Bytes, v$rollstat.xacts XActs,
v$rollstat.gets Gets, v$rollstat.waits Waits, v$rollstat.writes Writes,
sys.dba_rollback_segs.status status from v$rollstat, sys.dba_rollback_segs,
v$rollname where v$rollname.name(+) = sys.dba_rollback_segs.segment_name and
v$rollstat.usn (+) = v$rollname.usn order by rownum

15。耗资源的进程（top session）

select s.schemaname schema_name,     decode(sign(48 - command), 1,
to_char(command), 'Action Code #' || to_char(command) ) action,     status
session_status,  s.osuser os_user_name,    s.sid,         p.spid ,           s.serial# serial_num,    
nvl(s.username, '[Oracle process]') user_name,     s.terminal terminal,     
s.program program,     st.value criteria_value  from v$sesstat st,     v$session s  , v$process p  
where st.sid = s.sid and    st.statistic# = to_number('38') and     ('ALL' = 'ALL'
or s.status = 'ALL') and p.addr = s.paddr order by st.value desc,  p.spid asc, s.username asc, s.osuser asc

16。查看锁（lock）情况

select /*+ RULE */ ls.osuser os_user_name,  ls.username user_name,   
decode(ls.type, 'RW', 'Row wait enqueue lock', 'TM', 'DML enqueue lock', 'TX',
'Transaction enqueue lock', 'UL', 'User supplied lock') lock_type,   
o.object_name object,     decode(ls.lmode, 1, null, 2, 'Row Share', 3,
'Row Exclusive', 4, 'Share', 5, 'Share Row Exclusive', 6, 'Exclusive', null)
lock_mode,     o.owner,    ls.sid,     ls.serial# serial_num,    ls.id1,     ls.id2   
from sys.dba_objects o, (  select s.osuser,       s.username,      l.type,        
l.lmode,      s.sid,      s.serial#,       l.id1,      l.id2    from v$session s,       
v$lock l    where s.sid = l.sid ) ls  where o.object_id = ls.id1 and      o.owner
<> 'SYS'   order by o.owner, o.object_name

17。查看等待（wait）情况

SELECT v$waitstat.class, v$waitstat.count count, SUM(v$sysstat.value) sum_value
FROM v$waitstat, v$sysstat WHERE v$sysstat.name IN ('db block gets',
'consistent gets') group by v$waitstat.class, v$waitstat.count

18。查看sga情况

SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC

19。查看catched object

SELECT owner,              name,              db_link,              namespace, 
            type,              sharable_mem,              loads,              executions,  
           locks,              pins,           &n