ORACLE 日常操作【不断更新】

1.重建UNDO表空间

undo_management='MANUAL' ->CREATE UNDO TABLESPACE UNDOTBS1 DATAFILE '/U01/UNDOTBS2.DBF' SIZE 500M;

->undo_management='AUTO' undo_tablespace='UNDOTBS1' ->restart

2.查看执行计划

(1).explain plan for

sql;

select * from table(dbms_xplan.display);

(2).select * from table(dbms_xplan.display_cursor('5udc2pp1r6ua7',null,'BASIC')); --利用存储包

(3).select * from table(dbms_xplan.display_awr('6ujc0p8bzm409')); --利用AWR脚本

3.10046跟踪

oradebug setmypid

oradebug EVENT 10046 TRACE NAME CONTEXT FOREVER, LEVEL 12

oradebug TRACEFILE_NAME

执行sql

oradebug EVENT 10046 trace name context off

4.分析表 -- exec dbms_stats.gather_table_stats(user,'t1',cascade=>true);

5.修改sequence的cache值:alter sequence seq_share cache 1000;

6.dbms_job(包体)

7.查询UNDO使用情况以及具体SQL占用的UNDO块

SELECT DISTINCT tablespace_name,STATUS "状态",

COUNT(*) "EXTENT数量",

SUM(BYTES) / 1024 / 1024 / 1024 "UNDO大小"

FROM DBA_UNDO_EXTENTS

GROUP BY STATUS,tablespace_name

order by 1,2;

--------------------------

select s.username, u.name, s.sql_id, t.used_ublk, sq.sql_text

from v$transaction t, v$rollstat r, v$rollname u, v$session s, v$sql sq

where s.taddr = t.addr

and t.xidusn = r.usn

and r.usn = u.usn

and sq.sql_id = nvl(s.sql_id, s.PREV_SQL_ID)

order by s.username;

8.停止JOB

begin

DBMS_JOB.BROKEN (6718,true);

end;

commit;

9.查询SHARE POOL字池的空闲空间

select subpool,name,sum(bytes),round(sum(bytes)/1048576,2)mb

from (select 'shared pool('||decode(to_char(ksmdsidx),'0','0-Unused',ksmdsidx)||'):' subpool,ksmssnam name,

ksmsslen bytes

from x$ksmss where ksmsslen>0

and lower(ksmssnam) like lower('%free memory%'))

group by subpool,name order by subpool asc,sum(bytes) desc

10.查询对象ITL waits事件统计排名

select t.owner,t.object_name,t.object_type,statistic_name,t.value value

from v$segment_statistics t

where t.statistic_name='ITL waits'

AND t.value>10

order by value

11.PGA优化使用目标

workarea execution-optimal >=90%

workarea execution-multipass=0%

select name,value,100*(value/decode((select sum(value) from v$sysstat

where name like 'workarea executions%'),0,null,(select sum(value) from v$sysstat

where name like 'workarea executions%'))) pct

from v$sysstat where name like 'workarea executions%'