SELECT b.sid oracleID,
  b.username 登录Oracle用户名,
  b.serial#,
  spid 操作系统ID,
  paddr,
  sql_text 正在执行的SQL,
  b.machine 计算机名
FROM v$process a, v$session b, v$sqlarea c
WHERE a.addr = b.paddr
 AND b.sql_hash_value = c.hash_value

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 '2016-10-1/09:24:47' and
  '2016-10-1/09:24:47' order by b.FIRST_LOAD_TIME

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 

SELECT OSUSER 电脑登录身份,
  PROGRAM 发起请求的程序,
  USERNAME 登录系统的用户名,
  SCHEMANAME,
  B.Cpu_Time 花费cpu的时间,
  STATUS,
  B.SQL_TEXT 执行的sql
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 l.session_id sid,
  s.serial#,
  l.locked_mode 锁模式,
  l.oracle_username 登录用户,
  l.os_user_name 登录机器用户名,
  s.machine 机器名,
  s.terminal 终端用户名,
  o.object_name 被锁对象名,
  s.logon_time 登录数据库时间
FROM v$locked_object l, all_objects o, v$session s
WHERE l.object_id = o.object_id
 AND l.session_id = s.sid
ORDER BY sid, s.serial#;

alter system kill session 'sid， s.serial#‘;

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 ; 

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