在丢失归档情况下,恢复时常会遇到ORA-01113错误，以下实验模拟表空间offline，然后在丢失归档文件的情况下使用BBED修改文件头信息

在丢失归档情况下,恢复时常会遇到ORA-01113错误，以下实验模拟表空间offline，，然后在丢失归档文件的情况下使用BBED修改文件头信息，最后恢复数据文件；
数据库版本:

SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

数据文件信息:

SQL> select file#,name, CHECKPOINT_CHANGE#,to_char(CHECKPOINT_TIME,'yyyy-mm-dd hh24:mi:ss')checkpoint_time,status,BLOCK_SIZE from v$datafile;
FILE# NAME CHECKPOINT_CHANGE# CHECKPOINT_TIME STATUS BLOCK_SIZE
---------- ----------------------------------- ------------------ ------------------- ------- ----------
1 /u01/app/oradata/sydb/system01.dbf 31618 2015-04-13 20:46:37 SYSTEM 8192
2 /u01/app/oradata/sydb/sysaux01.dbf 31618 2015-04-13 20:46:37 ONLINE 8192
3 /u01/app/oradata/sydb/undotbs01.dbf 31618 2015-04-13 20:46:37 ONLINE 8192
4 /u01/app/oradata/sydb/users01.dbf 31618 2015-04-13 20:46:37 ONLINE 8192
5 /disk2/oradata/sydb/tbs01.dbf 31618 2015-04-13 20:46:37 ONLINE 8192
6 /disk2/oradata/sydb/tbs02.dbf 31618 2015-04-13 20:46:37 ONLINE 8192
7 /disk2/oradata/sydb/tbs03.dbf 31618 2015-04-13 20:46:37 ONLINE 8192
8 /tmp/tbs_tmp.dbf 31618 2015-04-13 20:46:37 ONLINE 8192

offline数据文件7并删除归档模拟ora-01113:

SQL> alter database datafile 7 offline;
Database altered.
SQL> alter system switch logfile;
System altered.
SQL> alter system switch logfile;
System altered.
SQL> alter database datafile 7 online;
alter database datafile 7 online
*
ERROR at line 1:
ORA-01113: file 7 needs media recovery
ORA-01110: data file 7: '/disk2/oradata/sydb/tbs03.dbf'

SQL> select file#,change#,time from v$recover_file;
FILE# CHANGE# TIME
---------- ---------- ---------
7 31618 13-APR-15

使用BBED需要修改的内容有:
ub4 kscnbas @484 #最后检查的SCN
ub4 kcvcptim @492 #检查时间
ub4 kcvfhcpc @140 #检查点发生次数
ub4 kcvfhccc @148 #未知,但值一直小于kcvfhcpc 1

BBED> info
File# Name Size(blks)
----- ---- ----------
1 /u01/app/oradata/sydb/system01.dbf 92160
2 /u01/app/oradata/sydb/sysaux01.dbf 71680
3 /u01/app/oradata/sydb/undotbs01.dbf 52480
4 /u01/app/oradata/sydb/users01.dbf 1600
5 /disk2/oradata/sydb/tbs01.dbf 221696
6 /disk2/oradata/sydb/tbs02.dbf 14592
7 /disk2/oradata/sydb/tbs03.dbf 2560
8 /tmp/tbs_tmp.dbf 1280

先确认好system表空间文件信息: