记录一次ORA-01200完美恢复

客户虚拟化平台断电，导致oracle其数据库启动ORA-01200错误

SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01122: database file 1 failed verification check
ORA-01110: data file 1: '/oradata/orcl/system01.dbf'
ORA-01200: actual file size of 1122560 is smaller than correct size of 1131520 blocks

对应的alert日志如下

Thu Jan 11 11:36:48 2024
ALTER DATABASE   MOUNT
Successful mount of redo thread 1, with mount id 1685778896
Database mounted in Exclusive Mode
Lost write protection disabled
Completed: ALTER DATABASE   MOUNT
Thu Jan 11 11:36:52 2024
ALTER DATABASE OPEN
Read of datafile '/oradata/orcl/system01.dbf' (fno 1) header failed with ORA-01200
Rereading datafile 1 header failed with ORA-01200
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_10847.trc:
ORA-01122: database file 1 failed verification check
ORA-01110: data file 1: '/oradata/orcl/system01.dbf'
ORA-01200: actual file size of 1122560 is smaller than correct size of 1131520 blocks
ORA-1122 signalled during: ALTER DATABASE OPEN...
Thu Jan 11 11:36:53 2024
Checker run found 1 new persistent data failures
Thu Jan 11 11:41:55 2024
alter database open
Read of datafile '/oradata/orcl/system01.dbf' (fno 1) header failed with ORA-01200
Rereading datafile 1 header failed with ORA-01200
Errors in file /u01/app/oracle/diag/rdbms/orcl/orcl/trace/orcl_ora_12550.trc:
ORA-01122: database file 1 failed verification check
ORA-01110: data file 1: '/oradata/orcl/system01.dbf'
ORA-01200: actual file size of 1122560 is smaller than correct size of 1131520 blocks
ORA-1122 signalled during: alter database open...

报错比较明显system01.dbf文件本来大小应该为1131521个block,但是实际上只有1122561个block,因此无法正常启动,通过修改数据文件欺骗数据库

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然后对异常的system文件进行处理,把人工构造的部分除掉

SQL> alter database datafile 1 resize 8770M;

Database altered.

rman检测system文件正常

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数据库恢复完成,数据完美恢复(0丢失,不用逻辑迁移),该库可以继续使用,以前有过类似case:
bbed处理ORA-01200故障
ORA-01122 ORA-01200故障处理
ORA-1200/ORA-1207数据库恢复