Oracle 11g dataguard undo恢复
环境：
os：CentOS5.5
db：oracle11g datauard
version：11.2.0.2.0
在primary收缩数据文件大小
ALTER DATABASE
DATAFILE '/oracle/oradata/skatedb/undotbs03.dbf'
RESIZE 1024M;
稍后就收到报警短信，登录standby库，发现在alert.logl里有如下错误
......
Media Recovery Waiting for thread 1 sequence 17248 (in transit)
Recovery of Online Redo Log: Thread 1 Group 8 Seq 17248 Reading mem 0
Mem# 0: /oracle/oradata/skatedb/sdbyredo08.log
Thu Oct 11 13:59:06 2012
Archived Log entry 10938 added for thread 1 sequence 17247 ID 0xa47b04d0 dest 1:
Thu Oct 11 14:06:26 2012
Errors in file /oracle/app/diag/rdbms/skate04/skatedb/trace/skatedb_pr0d_25721.trc (incident=40497):
ora-00600: internal error code, arguments: [3020], [3], [160], [12583072], [], [], [], [], [], [], [], []
ora-10567: Redo is inconsistent with data block (file# 3, block# 160, file offset is 1310720 bytes)
ora-10564: tablespace UNDOTBS1
ora-01110: data file 3: '/oracle/oradata/skatedb/undotbs01.dbf'
ora-10560: block type 'KTU SMU HEADER BLOCK'
Incident details in: /oracle/app/diag/rdbms/skate04/skatedb/incident/incdir_40497/skatedb_pr0d_25721_i40497.trc
Thu Oct 11 14:06:52 2012
......
standby库无法apply
重启standby，数据库可以
alter database mount standby database;
但是open read only的时候，总报如上的错误
在standby上，执行如下也不可以
sql> recover standby database;
为了解决这个问题，我们决定不恢复了undotbs01.dbf , 直接从primary把这个文件复制过来(主库的比较新)，
然后在恢复standby库，操作如下：
1.primary:
sql> ALTER TABLESPACE UNDOTBS1 BEGIN BACKUP;
2.standby:
shutdown immediate
3.primary:
把primary上的undotbs01.dbf文件copy到standby上，待copy完之后，一定要解冻（如不解冻，在standby库apply时会hang住）
sql> ALTER TABLESPACE UNDOTBS1 END BACKUP;
4.standby：
sql> startup nomount;
sql> alter database mount standby database;
sql> alter database open read only;
sql> alter database recover managed standby database disconnect using current logfile;
还有一个例子，为了节省空间，决定收缩undo的大小，步骤如下：
1.在primary上新建undotbs2表空间，查看并验证了在primary和standby上都有的表空间和相应的数据文件
2.在primary上更换在线undo表空间，如下命令
SQL> alter system set undo_tablespace = undotbs2 scope=both;
System altered
SQL>
在primary上查看
SQL> show parameter undo
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string AUTO
undo_retention integer 900
undo_tablespace string UNDOTBS2
但在standby上查看
SQL> show parameter undo
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
undo_management string AUTO
undo_retention integer 900
undo_tablespace string
，于是想通过更改到spfile文件里，然后重启库，结果错误出现（用如山方法恢复），理论不应该报错的。以后找环境继续测试的。
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