gn(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