ORACLE查詢低效率SQL和耗費內存的SQL

----低效率sql
SELECT EXECUTIONS , DISK_READS, BUFFER_GETS,
　　ROUND((BUFFER_GETS-DISK_READS)/BUFFER_GETS,2) Hit_radio,
　　ROUND(DISK_READS/EXECUTIONS,2) Reads_per_run,
　　SQL_TEXT
　　FROM　 V$SQLAREA
　　WHERE　EXECUTIONS>0
　　AND　　 BUFFER_GETS > 0
　　AND (BUFFER_GETS-DISK_READS)/BUFFER_GETS < 0.8
　　ORDER BY 4 DESC


--耗費內存SQL
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


---鎖表

select s.sid,s.machine,o.object_name,l.oracle_username,l.locked_mode,
'ALTER SYSTEM KILL SESSION '''||s.sid||', '||s.serial#||''';' Command
from v$locked_object l,v$session s,all_objects o
where l.session_id=s.sid and l.object_id=o.object_id;