select count(*) from v$session;
COLUMN file_name FORMAT A20
       b.tablespace_name, b.file_name ;
  from v_$lock l1, v$session s1
from v$session a,audit_actions b
------谁被锁住?
Select a.sid,a.serial#,a.username,A.LOCKWAIT,a.status,a.program,b.name
正在看的ORACLE教程是:ORACLE应用经验(2)。FORMAT A80

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       PHY.NAME='physical reads' ;
                  and l1.sid=s1.sid) ;
其中：logical_reads=db_block_gets+consistent_reads

select count(*) from sys.v_$transaction;
------查看哪些包要固定
       source_size+code_size+parsed_size+error_size BYPES
------谁在锁表?
                where l2.sid=s2.sid and l2.id1=l1
COLUMN u FORMAT A15
       (cur.value+con.value)/cur.value+con.value+phy.value)*100 HITS
c.program,c.status,d.name,c.osuser     


where exists (select * from v_$lock l2, v$session s2
     and a.session_id =c.sid(+)
   and s.sql_address=sa.address(+) ;
       CON.NAME='consistent gets' AND
COLUMN segment_name FORMAT A15
where type='PACKAGE BODY' ORDER BY 4 DESC ;
       ('system undo header', 'system undo block',


select class, count from v$waitstat
                  and request=0
COLUMN s

  from v$sysstat cur, v$sysstat con, v$sysstat phy

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     audit_actions d

  from v$session s, v$transaction t, dba_rollback_segs r, v$sqlarea sa


       ('db block gets', 'consistents gets') ;
from v$session a,audit_actions b
正在看的ORACLE教程是:ORACLE应用经验(2)。------谁正在访问数据库?
where owner-'SyS'
     v$session c,
        'undo header', 'undo block') ;
where CUR.NAME='db block gets' AND
And  username='&1';

where row_wait_obj#=object_id and type='USER'
------查看有事务在哪几个回退段中：

------如何检测ROLLBACK SEGMENT竞争?
ZYP_35.98
where a.command=b.action
      Hits=Logical_reads/(logical_reads+physical_reads)
  from dba_extents a, dba_data_files b
AND LOCKWAIT IS NOT NULL;
where s.taddr=t.addr and t.sidusn=r.segmant_id(+)
Select owner, name, type,
Select tablespace_name, owner, segment_name,segment_type
  from dba_object_size

                  and s2.lockwait=l2.kaddr
    若count/sum(value)大于1%，则应考虑增加ROLLBACK SEGMENT
where a.command=b.action
       and segment_type_-'ROLLBACK'
where a.file_id-b.file_id group by a.owner, a.segment_name,
COLUMN s FORMAT A15
AND STATUS='ACTIVE';
Select a.sid,a.serial#,a.username,A.LOCKWAIT,a.status,a.program,b.name
Select a.sid,a.serial#,a.username,a.status,a.program,b.name,a.osuser
from v$session a,audit_actions b
order by tablespace_name, owner, segment_name ;
break on owner on segment_name
cOLUMN tablespace_name FORMAT A15
Select sid, serial#, object_name, row_wait_block#,

     and c.command=d.action;
       and lockwait is not null ;
select sum(value) from v$sysstat where name in
Select sl.username, sl.sid, sl.serial#

alter system kill session '&1,&2';
where a.object_id=b.object_id
Select c.sid, c.serial#,c.username,a.object_id,b.object_name,

where class in
select count(*) from sys.v_$process;
select cur.value db, con.value con, phy.value phy,

       row_wait_row#, row_wait_file#
select osuser o, username u, segment_name s, sa.sql_text
  from all_objects, v$session
------看内存缓冲区使用效率的指数是命中率HITS:
SELECT A.owner, a.segment_name, b.tablespace_name, b.file_name,
where a.command=b.action
COLUMN OWNER FORMAT A10
       sum(a.bytes) bytes
from v$Locked_object a,
     All_objects b,
  from dba_segments

------查看一个用户拥有哪些表空间的实体信息: