Oracle undo表空間爆滿的解決

lygle發表於2013-04-06
Oracle undo表空間爆滿的解決
1. 啟動SQLPLUS,並用sys登陸到資料庫
#su - oracle
$>sqlplus / as sysdba
2. 查詢資料庫的UNDO表空間名,確定當前例程正在使用的UNDO表空間:
Show parameter undo_tablespace。
3. 確認UNDO表空間;
SQL> select name from v$tablespace;
NAME
------------------------------
UNDOTBS1
4. 檢查資料庫UNDO表空間佔用空間情況以及資料檔案存放位置;
select file_name, bytes / 1024 / 1024 / 1024
from dba_data_files
where tablespace_name like 'UNDOTBS%';
5. 檢視回滾段的使用情況,哪個使用者正在使用回滾段的資源,如果有使用者最好更換時間(特別是生產環境)。
select s.username, u.name
from v$transaction t, v$rollstat r, v$rollname u, v$session s
where s.taddr = t.addr
and t.xidusn = r.usn
and r.usn = u.usn
order by s.username;
查詢結果為空的話就能刪除。
6. 檢查UNDO Segment狀態;
select usn,
xacts,
rssize / 1024 / 1024 / 1024,
hwmsize / 1024 / 1024 / 1024,
shrinks
from v$rollstat
order by rssize;
USN XACTS RSSIZE/1024/1024/1024 HWMSIZE/1024/1024/1024 SHRINKS
8 0 0.00017547607421875 3.11521148681641 700
3 0 0.00023651123046875 3.22954559326172 632
0 0 0.00035858154296875 0.00035858154296875 0
1 0 0.00206756591796875 3.04867553710938 920
10 0 0.00206756591796875 0.648170471191406 819
7 0 0.00231170654296875 3.94835662841797 730
4 0 0.00304412841796875 2.00011444091797 651
11 0 0.00695037841796875 2.26921844482422 740
9 0 0.00792694091796875 2.07530975341797 773
6 0 0.00792694091796875 1.31906890869141 775
2 0 0.00890350341796875 3.13677215576172 699
5 0 1.96833801269531 3.99906921386719 267
這還原表空間中還存在12個回滾的物件。
7. 建立新的UNDO表空間,並設定自動擴充套件引數;
create undo tablespace undotbs2 datafile '/u02/pnrdb/undotbs2_01.dbf' size 100m reuse autoextend on next 100m maxsize unlimited;
8. 切換UNDO表空間為新的UNDO表空間 , 動態更改spfile配置檔案;
alter system set undo_tablespace=undotbs2 scope=both;
9.驗證當前資料庫的 UNDO表空間
SQL> show parameter undo
NAME TYPE VALUE
------------------------------------ ----------- --------------
undo_management string AUTO
undo_retention integer 900
undo_tablespace string UNDOTBS2
9. 等待原UNDO表空間所有UNDO SEGMENT OFFLINE;
select usn,
xacts,
status,
rssize / 1024 / 1024,
hwmsize / 1024 / 1024,
shrinks
from v$rollstat
order by rssize;
select usn,
xacts,
status,
rssize / 1024 / 1024,
hwmsize / 1024 / 1024,
shrinks
from v$rollstat
order by rssize;
select t.segment_name, t.tablespace_name, t.segment_id, t.status
from dba_rollback_segs t;
SEGMENT_NAME TABLESPACE_NAME SEGMENT_ID STATUS
_SYSSMU1$ UNDOTBS1 1 OFFLINE
_SYSSMU2$ UNDOTBS1 2 OFFLINE
_SYSSMU3$ UNDOTBS1 3 OFFLINE
_SYSSMU4$ UNDOTBS1 4 OFFLINE
_SYSSMU5$ UNDOTBS1 5 OFFLINE
_SYSSMU6$ UNDOTBS1 6 OFFLINE
_SYSSMU7$ UNDOTBS1 7 OFFLINE
_SYSSMU8$ UNDOTBS1 8 OFFLINE
_SYSSMU9$ UNDOTBS1 9 OFFLINE
_SYSSMU10$ UNDOTBS1 10 OFFLINE
_SYSSMU11$ UNDOTBS1 11 OFFLINE
_SYSSMU12$ UNDOTBS1 12 OFFLINE
_SYSSMU13$ UNDOTBS1 13 OFFLINE
_SYSSMU14$ UNDOTBS1 14 OFFLINE
_SYSSMU15$ UNDOTBS1 15 OFFLINE
_SYSSMU16$ UNDOTBS1 16 OFFLINE
_SYSSMU17$ UNDOTBS1 17 OFFLINE
_SYSSMU18$ UNDOTBS1 18 OFFLINE
_SYSSMU19$ UNDOTBS1 19 OFFLINE
_SYSSMU20$ UNDOTBS1 20 OFFLINE
_SYSSMU21$ UNDOTBS1 21 OFFLINE
_SYSSMU22$ UNDOTBS1 22 OFFLINE
_SYSSMU23$ UNDOTBS1 23 OFFLINE
_SYSSMU24$ UNDOTBS1 24 OFFLINE
_SYSSMU25$ UNDOTBS1 25 OFFLINE
_SYSSMU26$ UNDOTBS1 26 OFFLINE
_SYSSMU27$ UNDOTBS1 27 OFFLINE
_SYSSMU28$ UNDOTBS1 28 OFFLINE
_SYSSMU29$ UNDOTBS1 29 OFFLINE
_SYSSMU30$ UNDOTBS1 30 OFFLINE
_SYSSMU31$ UNDOTBS1 31 OFFLINE
_SYSSMU32$ UNDOTBS1 32 OFFLINE
_SYSSMU33$ UNDOTBS1 33 OFFLINE
_SYSSMU34$ UNDOTBS1 34 OFFLINE
_SYSSMU35$ UNDOTBS1 35 OFFLINE
上面對應的UNDOTBS1還原表空間所對應的回滾段均為OFFLINE
10.到$ORACLE_HOME/dbs/init$ORACLE_SID.ora如下內容是否發生變更:
#cat $ORACLE_HOME/dbs/initddptest.ora
……
*.undo_management=’AUTO’
*.undo_retention=10800
*.undo_tablespace=’UNDOTBS2’
……
如果沒有發生變更請執行如下語句:
SQL> create pfile from spfile;
File created.
11. 刪除原有的UNDO表空間;
drop tablespace undotbs1 including contents and datafiles;
12. os級別釋放undo資料檔案;
到root下執行
lsof |grep /u02/pnrdb/undotbs01.dbf
lsof |grep /u02/pnrdb/undotbs01.dbf |awk '{printf"kill -9 "$2"\n"}'

來自 “ ITPUB部落格 ” ,連結:http://blog.itpub.net/28673746/viewspace-757825/,如需轉載,請註明出處,否則將追究法律責任。

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