Oracle操作

              1.查询用户下所有的表：

• 方法一：以A用户登录数据库，执行select table_name from user_tables;

  方法二：以system用户登录数据，执行select table_name from dba_tables where owner='A';

  2 session

  SELECT L.SESSION_ID SID, S.SERIAL#, L.LOCKED_MODE,L.ORACLE_USERNAME,

    L.OS_USER_NAME,S.MACHINE, S.TERMINAL, O.OBJECT_NAME, S.LOGON_TIME

    FROM V$LOCKED_OBJECT L, ALL_OBJECTS O, V$SESSION S

    WHERE L.OBJECT_ID = O.OBJECT_ID

    AND L.SESSION_ID = S.SID

    ORDER BY SID, S.SERIAL# ;

  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_PER,(C.BYTES*100)/A.BYTES FREE_PER

  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$processp

  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