查询Oracle正在执行和执行过的SQL语句

　　---正在执行的

　　select a.username, a.sid,b.SQL_TEXT, b.SQL_FULLTEXT

　　from v$session a, v$sqlarea b

　　where a.sql_address = b.address

　　---执行过的

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

　　from v$sqlarea b

　　where b.FIRST_LOAD_TIME between '2009-10-15/09:24:47' and

　　'2009-10-15/09:24:47' order by b.FIRST_LOAD_TIME

　　(此方法好处可以查看某一时间段执行过的sql，并且 SQL_FULLTEXT 包含了完整的 sql 语句)

　　其他

　　select OSUSER,PROGRAM,USERNAME,SCHEMANAME,B.Cpu_Time,STATUS,B.SQL_TEXT

　　from V$SESSION A LEFT JOIN V$SQL B ON A.SQL_ADDRESS=B.ADDRESS AND A.SQL_HASH_VALUE=B.HASH_VALUE order by b.cpu_time desc

　　select address, sql_text, piece

　　from v$session, v$sqltext

　　where address = sql_address

　　-- and machine = < you machine name >

　　order by address, piece

　　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