一些常用的SQL 语句 之4

 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