Oracle undo表空间爆满的解决

Oracle undo表空间爆满的解决

1. 启动SQLPLUS，并用sys登陆到数据库。

#su - oracle

$>sqlplus / as sysdba

2. 查找数据库的UNDO表空间名,确定当前例程正在使用的UNDO表空间：

Show parameter undo_tablespace。

3. 确认UNDO表空间；

SQL> select name from v$tablespace;

NAME

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

UNDOTBS1

4. 检查数据库UNDO表空间占用空间情况以及数据文件存放位置；

select file_name, bytes / 1024 / 1024 / 1024

from dba_data_files

where tablespace_name like 'UNDOTBS%';

5. 查看回滚段的使用情况，哪个用户正在使用回滚段的资源，如果有用户最好更换时间（特别是生产环境）。

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;

查询结果为空的话就能删除。

6. 检查UNDO Segment状态；

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

这还原表空间中还存在12个回滚的对象。

7. 创建新的UNDO表空间，并设置自动扩展参数；

create undo tablespace undotbs2 datafile '/u02/pnrdb/undotbs2_01.dbf' size 100m reuse autoextend on next 100m maxsize unlimited;

8. 切换UNDO表空间为新的UNDO表空间 ， 动态更改spfile配置文件；

alter system set undo_tablespace=undotbs2 scope=both;

9.验证当前数据库的 UNDO表空间

SQL> show parameter undo

NAME TYPE VALUE

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

undo_management string AUTO

undo_retention integer 900

undo_tablespace string UNDOTBS2

9. 等待原UNDO表空间所有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

上面对应的UNDOTBS1还原表空间所对应的回滚段均为OFFLINE

10.到$ORACLE_HOME/dbs/init$ORACLE_SID.ora如下内容是否发生变更：

#cat $ORACLE_HOME/dbs/initddptest.ora

……

*.undo_management=’AUTO’

*.undo_retention=10800

*.undo_tablespace=’UNDOTBS2’

……

如果没有发生变更请执行如下语句：

SQL> create pfile from spfile;

File created.

11. 删除原有的UNDO表空间；

drop tablespace undotbs1 including contents and datafiles;

12. os级别释放undo数据文件；

到root下执行

lsof |grep /u02/pnrdb/undotbs01.dbf

lsof |grep /u02/pnrdb/undotbs01.dbf |awk '{printf"kill -9 "$2"\n"}'