standby_file_management 参数为manual 导致ORA-01111问题

情景：

Dataguard 物理备库执行恢复报错：

Errors in file /home/u01/app/diag/rdbms/rzorcl11g/ORCL/trace/ORCL_pr00_35893.trc:
ORA-01111: name for data file 20 is unknown - rename to correct file
ORA-01110: data file 20: '/home/u01/app/oracle/product/11.2.0/db_1/dbs/UNNAMED00020'
ORA-01157: cannot identify/lock data file 20 - see DBWR trace file
ORA-01111: name for data file 20 is unknown - rename to correct file
ORA-01110: data file 20: '/home/u01/app/oracle/product/11.2.0/db_1/dbs/UNNAMED00020'
Recovery Slave PR00 previously exited with exception 1111
MRP0: Background Media Recovery process shutdown (ORCL)

原因：参数standby_file_management 值是manual，导致主库增加数据文件时候备库没有自动增加。

SQL> show parameter standby_file_management

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
standby_file_management     string          MANUAL

SQL> select file#,name from v$datafile where file#=20;

FILE#    NAME
---------- ----------------------------------------------------------------------------------------
20          /home/u01/app/oracle/product/11.2.0/db_1/dbs/UNNAMED00020

解决方法： 将该文件rename到正确的目录中，然后设置standby_file_management参数的值为auto。

SQL> alter database create datafile '/home/u01/app/oracle/product/11.2.0/db_1/dbs/UNNAMED00020' as '/home/u01/app/oradata/orcl11g/fsownbox04.dbf';

SQL> alter system set standby_file_management = auto;

再执行恢复：

SQL> alter database recover managed standby database disconnect from session;