10g的一些和资源、计划有关的视图

1.从v$sessmetric中找出当前最占资源的会话

select to_char(m.END_TIME, 'YYYY-MM-DD HH24:MI:SS') end_time,
       m.INTSIZE_CSEC / 100 ints,
       s.USERNAME,
       m.SESSION_ID sid,
       m.SESSION_SERIAL_NUM ssn,
       round(m.CPU) cpu,
       m.PHYSICAL_READS prds,
       m.LOGICAL_READS lrds,
       m.PGA_MEMORY pga,
       m.HARD_PARSES,
       m.SOFT_PARSES,
       m.PHYSICAL_READ_PCT,
       m.LOGICAL_READ_PCT,
       s.SQL_ID
  from v$sessmetric m, v$session s
 where (m.PHYSICAL_READS > 100 or m.CPU > 100 or m.LOGICAL_READS > 100)
   and m.SESSION_ID = s.SID
   and m.SESSION_SERIAL_NUM = s.SERIAL#
   and s.USERNAME not in ('SYS', 'SYSTEM')
 order by m.PHYSICAL_READS desc, m.CPU desc, m.LOGICAL_READS desc

2.查看今天可用的AWR快照

select t.snap_id,
       to_char(t.begin_interval_time, 'YYYY-MM-DD HH24:MI:SS') begintime,
       to_char(t.end_interval_time, 'YYYY-MM-DD HH24:MI:SS') endtime
  from dba_hist_snapshot t
 where t.begin_interval_time > trunc(sysdate)

3.从dba_hist_sqlstat获取最占用资源的sql

select t.snap_id,
       t.disk_reads_delta,
       t.executions_delta,
       t.disk_reads_delta /
       decode(t.executions_delta, 0, 1, t.executions_delta) ratio,
       t.sql_id
  from dba_hist_sqlstat t
 where t.disk_reads_delta > 100000
 order by t.disk_reads_delta desc

根据查询出来的sql_id还可以在dba_hist_sqltext去查询相关完整的sql语句