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<p><FONT class=normalfont><B><font color=blue>ORACLE应用经验(2)</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：作者<br>来自：Linux知识宝库<br>联系方式：无名<br><br>------谁正在访问数据库?<br>
Select c.sid, c.serial#,c.username,a.object_id,b.object_name,<br>
c.program,c.status,d.name,c.osuser <br>
from v$Locked_object a,<br>
All_objects b,<br>
v$session c,<br>
audit_actions d<br>
where a.object_id=b.object_id<br>
and a.session_id =c.sid(+)<br>
and c.command=d.action;<br>
<br>
alter system kill session '&1,&2';<br>
<br>
Select a.sid,a.serial#,a.username,a.status,a.program,b.name,a.osuser<br>
from v$session a,audit_actions b <br>
where a.command=b.action<br>
And username='&1';<br>
------谁被锁住?<br>
Select a.sid,a.serial#,a.username,A.LOCKWAIT,a.status,a.program,b.name<br>
from v$session a,audit_actions b <br>
where a.command=b.action<br>
AND LOCKWAIT IS NOT NULL;<br>
------谁在锁表?<br>
Select a.sid,a.serial#,a.username,A.LOCKWAIT,a.status,a.program,b.name<br>
from v$session a,audit_actions b <br>
where a.command=b.action<br>
AND STATUS='ACTIVE';<br>
<br>
Select sid, serial#, object_name, row_wait_block#,<br>
row_wait_row#, row_wait_file#<br>
from all_objects, v$session<br>
where row_wait_obj#=object_id and type='USER'<br>
and lockwait is not null ;<br>
<br>
Select sl.username, sl.sid, sl.serial#<br>
from v_$lock l1, v$session s1<br>
where exists (select * from v_$lock l2, v$session s2<br>
where l2.sid=s2.sid and l2.id1=l1<br>
and s2.lockwait=l2.kaddr<br>
and request=0<br>
and l1.sid=s1.sid) ;<br>
<br>
select count(*) from v$session;<br>
select count(*) from sys.v_$process;<br>
select count(*) from sys.v_$transaction;<br>
<br>
ZYP_35.98<br>
<br>
------查看哪些包要固定<br>
COLUMN OWNER FORMAT A10<br>
Select owner, name, type,<br>
source_size+code_size+parsed_size+error_size BYPES<br>
from dba_object_size<br>
where type='PACKAGE BODY' ORDER BY 4 DESC ;<br>
<br>
------查看一个用户拥有哪些表空间的实体信息:<br>
Select tablespace_name, owner, segment_name,segment_type<br>
from dba_segments<br>
where owner-'SyS'<br>
and segment_type_-'ROLLBACK'<br>
order by tablespace_name, owner, segment_name ;<br>
<br>
break on owner on segment_name<br>
COLUMN segment_name FORMAT A15<br>
cOLUMN tablespace_name FORMAT A15<br>
COLUMN file_name FORMAT A20<br>
SELECT A.owner, a.segment_name, b.tablespace_name, b.file_name,<br>
sum(a.bytes) bytes<br>
from dba_extents a, dba_data_files b<br>
where a.file_id-b.file_id group by a.owner, a.segment_name,<br>
b.tablespace_name, b.file_name ;<br>
<br>
------看内存缓冲区使用效率的指数是命中率HITS:<br>
Hits=Logical_reads/(logical_reads+physical_reads)<br>
其中：logical_reads=db_block_gets+consistent_reads<br>
<br>
select cur.value db, con.value con, phy.value phy,<br>
(cur.value+con.value)/cur.value+con.value+phy.value)*100 HITS<br>
from v$sysstat cur, v$sysstat con, v$sysstat phy<br>
where CUR.NAME='db block gets' AND<br>
CON.NAME='consistent gets' AND<br>
PHY.NAME='physical reads' ;<br>
<br>
------如何检测ROLLBACK SEGMENT竞争?<br>
select class, count from v$waitstat<br>
where class in<br>
('system undo header', 'system undo block',<br>
'undo header', 'undo block') ;<br>
<br>
select sum(value) from v$sysstat where name in<br>
('db block gets', 'consistents gets') ;<br>
<br>
若count/sum(value)大于1%，则应考虑增加ROLLBACK SEGMENT<br>
<br>
------查看有事务在哪几个回退段中：<br>
COLUMN u FORMAT A15<br>
COLUMN s FORMAT A15<br>
COLUMN s FORMAT A80<br>
select osuser o, username u, segment_name s, sa.sql_text<br>
from v$session s, v$transaction t, dba_rollback_segs r, v$sqlarea sa<br>
where s.taddr=t.addr and t.sidusn=r.segmant_id(+)<br>
and s.sql_address=sa.address(+) ;<br>
<br>
结束<br>
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