ORACLE中可以通过v$session表查看当前有效的session信息，并且可以通过v$session的sql_id或sql_address通过关联查询v$sql查看当前正在执行的sql语句；

如果想查看session近期执行的sql语句,可以通过v$active_session_history表中的sql_id查看近期历史执行的sql语句,要求数据库的liberary没有被fresh。

SELECT b.sql_text, --content of SQL

a.machine, --which machine run this code

a.username, a.module, -- the method to run this SQL

c.sofar / totalwork * 100, --conplete percent

c.elapsed_seconds, --run time

c.time_remaining --remain to run time

FROM v$session a, v$sqlarea b, v$session_longops c

WHERE a.sql_hash_value = b.hash_value(+) AND a.SID = c.SID(+)

AND a.serial# = c.serial#(+)

--AND a.sid=139

Oracle 最近执行过的sql语句:

SELECT sql_text, last_load_time

FROM v$sql

WHERE last_load_time IS NOT NULL

ORDER BY last_load_time DESC

其它，

SELECT sql_text,last_load_time FROM v$sql order by last_load_time desc;

SELECT sql_text, last_load_time FROM v$sql WHERE last_load_time IS NOT NULL and sql_text like 'select%' ORDER BY last_load_time DESC;

SELECT sql_text, last_load_time FROM v$sql WHERE last_load_time IS NOT NULL and sql_text like 'update%' ORDER BY last_load_time DESC;

SELECT sql_text, last_load_time FROM v$sql WHERE last_load_time IS NOT NULL and last_load_time like' 14-06-09%' ORDER BY last_load_time DESC;

监控concurrent 正在执行的sql

SELECT a.sid, a.serial#, b.sql_text

FROM v$session a, v$sqltext b

WHERE a.sql_address = b.address

--AND a.sid = <...>

ORDER BY b.piece

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