oracle查问题

1:确定当前登入用户

select user from dual;
select * from user_users;

 2：查看用户权限

select * from user_role_privs; 角色
select * from session_privs; 权限

 3：查看后台进行的sql

select a.program,a.username,b.spid,c.sql_text from v$session a,v$process b,v$sqlarea c where a.paddr=b.addr and a.sql_hash_value=c.hash_value and a.username is not null;

或

select a.username, a.sid,b.SQL_TEXT, b.SQL_FULLTEXT
from v$session a, v$sqlarea b
where a.sql_address = b.address

 跟据用户查找它的sql

select sid,serial# from v$session where username='username';

 kill掉这个sql

alter system kill session 'sid,serial#'

 执行过的sql（跟据时间查）

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

 4：连接的用户

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

 5：查看性能很差的sql

按磁盘性能

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 ;

 io

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