数据库管理员日常工作中必备的sql列表 （1）

数据库管理员日常工作中必备的sql列表：

--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_hash_value=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(10g)

 

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.ty