常用oracle 数据库查询 重要！！

常用oracle 数据库查询：

查询Oracle正在执行的sql语句 

转载 http://blog.csdn.net/jlds123/article/details/6572559   

查询执行过的语句：

select b.SQL_TEXT,b.FIRST_LOAD_TIME,b.SQL_FULLTEXT

  from v$sqlarea bwhere b.FIRST_LOAD_TIME between '2009-10-15/09:24:47' and       '2009-10-15/09:24:47' order by b.FIRST_LOAD_TIME

查找前十条性能差的sql. SELECT * FROM (select PARSING_USER_ID,EXECUTIONS,SORTS, COMMAND_TYPE,DISK_READS,sql_text FROM v$sqlarea order BY disk_reads DESC )where ROWNUM<10 ; 

查看占io较大的正在运行的session SELECT se.sid,se.serial#,pr.SPID,se.username,se.status, se.terminal,se.program,se.MODULE,、se.sql_address,st.event,st. p1text,si.physical_reads, si.block_changes FROM v$session se,v$session_wait st, v$sess_io si,v$process pr WHERE st.sid=se.sid AND st. sid=si.sid AND se.PADDR=pr.ADDR AND se.sid>6 AND st. wait_time=0 AND st.event NOT LIKE '%SQL%' ORDER BY physical_reads DESC