--监控索引是否使用

alter index &index_name monitoring usage;

alter index &index_name nomonitoring usage;

select * from v$object_usage where index_name = &index_name;

--求数据文件的I/O分布

select df.name,phyrds,phywrts,phyblkrd,phyblkwrt,singleblkrds,readtim,writetim

from v$filestat fs,v$dbfile df

where fs.file#=df.file# order by df.name;

--求某个隐藏参数的值

col ksppinm format a54

col ksppstvl format a54

select ksppinm, ksppstvl

from x$ksppi pi, x$ksppcv cv

where cv.indx=pi.indx and pi.ksppinm like '\_%' escape '\' and pi.ksppinm like '%meer%';

--求系统中较大的latch

select name,sum(gets),sum(misses),sum(sleeps),sum(wait_time)

from v$latch_children

group by name having sum(gets) > 50 order by 2;

--求归档日志的切换频率(生产系统可能时间会很长)

select start_recid,start_time,end_recid,end_time,minutes from (select test.*, rownum as rn

from (select b.recid start_recid,to_char(b.first_time,'yyyy-mm-dd hh24:mi:ss') start_time,

a.recid end_recid,to_char(a.first_time,'yyyy-mm-dd hh24:mi:ss') end_time,round(((a.first_time-b.first_time)*24)*60,2) minutes

from v$log_history a,v$log_history b where a.recid=b.recid+1 and b.first_time > sysdate - 1

order by a.first_time desc) test) y where y.rn < 30

--求回滚段正在处理的事务

select a.name,b.xacts,c.sid,c.serial#,d.sql_text

from v$rollname a,v$rollstat b,v$session c,v$sqltext d,v$transaction e

where a.usn=b.usn and b.usn=e.xidusn and c.taddr=e.addr

and c.sql_address=d.address and c.sql_hashvalue=d.hash_value order by a.name,c.sid,d.piece;

--求出无效的对象

select 'alter procedure '||object_name||' compile;'

from dba_objects

where status='INVALID' and wner='&' and object_type in ('PACKAGE','PACKAGE BODY');

/

select owner,object_name,object_type,status from dba_objects where status='INVALID';

--求process/session的状态

select p.pid,p.spid,s.program,s.sid,s.serial#

from v$process p,v$session s where s.paddr=p.addr;

--求当前session的状态

select sn.name,ms.value

from v$mystat ms,v$statname sn

where ms.statistic#=sn.statistic# and ms.value > 0;

--求表的索引信息

select ui.table_name,ui.index_name

from user_indexes ui,user_ind_columns uic

where ui.table_name=uic.table_name and ui.index_name=uic.index_name

and ui.table_name like '&table_name%' and uic.column_name='&column_name';

--显示表的外键信息

col search_condition format a54

select table_name,constraint_name

from user_constraints

where constraint_type ='R' and constraint_name in (select constraint_name from user_cons_columns where column_name='&1');

select rpad(child.table_name,25,' ') child_tablename,

rpad(cp.column_name,17,' ') referring_column,rpad(parent.table_name,25,' ') parent_tablename,

rpad(pc.column_name,15,' ') referred_column,rpad(child.constraint_name,25,' ') constraint_name

from user_constraints child,user_constraints parent,

user_cons_columns cp,user_cons_columns pc

where child.constraint_type = 'R' and child.r_constraint_name = parent.constraint_name and

child.constraint_name = cp.constraint_name and parent.constraint_name = pc.constraint_name and

cp.position = pc.position and child.table_name ='&table_name'

order by child.owner,child.table_name,child.constraint_name,cp.position;

--显示表的分区及子分区(user_tab_subpartitions)

col table_name format a16

col partition_name format a16

col high_value format a81

select table_name,partition_name,HIGH_VALUE from user_tab_partitions where table_name='&table_name'

--使用dbms_xplan生成一个执行计划

explain plan set statement_id = '&sql_id' for &sql;

select * from table(dbms_xplan.display);

--求某个事务的重做信息(bytes)

select s.name,m.value

from v$mystat m,v$statname s

where m.statistic#=s.statistic# and s.name like '%redo size%';

--求cache中缓存超过其5%的对象

select o.owner,o.object_type,o.object_name,count(b.objd)

from v$bh b,dba_objects o

where b.objd = o.object_id

group by o.owner,o.object_type,o.object_name

having count(b.objd) > (select to_number(value)*0.05 from v$parameter where name = 'db_block_buffers');

--求谁阻塞了某个session()

select sid, username, event, blocking_session,

seconds_in_wait, wait_time

from v$session where state in ('WAITING') and wait_class != 'Idle';

--求session的OS进程ID

col program format a54

select p.spid "OS Thread", b.name "Name-User", s.program

from v$process p, v$session s, v$bgprocess b

where p.addr = s.paddr and p.addr = b.paddr

UNION ALL

select p.spid "OS Thread", s.username "Name-User", s.program

from v$process p, v$session s where p.addr = s.paddr and s.username is not null;

--查会话的阻塞

col user_name format a32

select /*+ rule */ lpad(' ',decode(l.xidusn ,0,3,0))||l.oracle_username user_name, o.owner,o.object_name,s.sid,s.serial#

from v$locked_object l,dba_objects o,v$session s

where l.object_id=o.object_id and l.session_id=s.sid order by o.object_id,xidusn desc ;

col username format a15

col lock_level format a8

col owner format a18

col object_name format a32

select /*+ rule */ s.username, decode(l.type,'tm','table lock', 'tx','row lock', null) lock_level, o.owner,o.object_name,s.sid,s.serial#

from v$session s,v$lock l,dba_objects o

where l.sid = s.sid and l.id1 = o.object_id(+) and s.username is not null ;

--求等待的事件及会话信息/求会话的等待及会话信息

select se.sid,s.username,se.event,se.total_waits,se.time_waited,se.average_wait

from v$session s,v$session_event se

where s.username is not null and se.sid=s.sid and s.status='ACTIVE' and se.event not like '%SQL*Net%' order by s.username;

select s.sid,s.username,sw.event,sw.wait_time,sw.state,sw.seconds_in_wait

from v$session s,v$session_wait sw

where s.username is not null and sw.sid=s.sid and sw.event not like '%SQL*Net%' order by s.username;

--求会话等待的file_id/block_id

col event format a24

col p1text format a12

col p2text format a12

col p3text format a12

select sid,event,p1text, p1, p2text, p2, p3text, p3

from v$session_wait

where event not like '%SQL%' and event not like '%rdbms%' and event not like '%mon%' order by event;

select name,wait_time from v$latch l where exists (select 1 from (select sid,event,p1text, p1, p2text, p2, p3text, p3

from v$session_wait

where event not like '%SQL%' and event not like '%rdbms%' and event not like '%mon%'

) x where x.p1= l.latch#);

--求会话等待的对象

col owner format a18

col segment_name format a32

col segment_type format a32

select owner,segment_name,segment_type

from dba_extents

where file_id = &file_id and &block_id between block_id and block_id + blocks - 1;

--求buffer cache中的块信息

select o.OBJECT_TYPE, substr(o.OBJECT_NAME,1,10) objname , b.objd , b.status, count(b.objd)

from v$bh b, dba_objects o

where b.objd = o.data_object_id and o.owner = '&1' group by o.object_type, o.object_name,b.objd, b.status ;

--求日志文件的空间使用

select le.leseq current_log_sequence#, 100*cp.cpodr_bno/le.lesiz percentage_full

from x$kcccp cp,x$kccle le

where le.leseq =cp.cpodr_seq;

--求等待中的对象

select /*+rule */ s.sid, s.username, w.event, o.owner, o.segment_name, o.segment_type,

o.partition_name, w.seconds_in_wait seconds, w.state

from v$session_wait w, v$session s, dba_extents o

where w.event in (select name from v$event_name where parameter1 = 'file#'

and parameter2 = 'block#' and name not like 'control%')

and o.owner <> 'sys' and w.sid = s.sid and w.p1 = o.file_id and w.p2 >= o.block_id and w.p2 < o.block_id + o.blocks

--求当前事务的重做尺寸

select value

from v$mystat, v$statname

where v$mystat.statistic# = v$statname.statistic# and v$statname.name = 'redo size';

--唤醒smon去清除临时段

column pid new_value Smon

set termout off

select p.pid from sys.v_$bgprocess b,sys.v_$process p where b.name = 'SMON' and p.addr = b.paddr

/

set termout on

oradebug wakeup &Smon

undefine Smon

--求回退率

select b.value/(a.value + b.value),a.value,b.value from v$sysstat a,v$sysstat b

where a.statistic#=4 and b.statistic#=5;

--求DISK READ较多的