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
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