ORA-00349: failure obtaining block size for '+fra_grp01_d

有一次恢复库以后，open时报错ORA-00349,如下。最后通过删除这个log group解决。
 
SQL> alter database open resetlogs;
alter database open resetlogs
*
ERROR at line 1:
ORA-00349: failure obtaining block size for '+fra_grp01_d

select group#,name,bytes,status from v$logfile;
SQL> /
         1 /paic/hq/bk/restore/data/oradata/aims/group_1.257.788444161
         1 /paic/hq/bk/restore/data/oradata/aims/group_1.257.788444163
         2 /paic/hq/bk/restore/data/oradata/aims/group_2.258.788444163
         2 +fra_grp01_dg INVALID
         3 /paic/hq/bk/restore/data/oradata/aims/group_3.259.788444163
         3 /paic/hq/bk/restore/data/oradata/aims/group_3.259.788444165
         4 /paic/hq/bk/restore/data/oradata/aims/group_4.266.788744427
         4 /paic/hq/bk/restore/data/oradata/aims/group_4.448.788744427
         5 /paic/hq/bk/restore/data/oradata/aims/group_5.267.788744443
         5 /paic/hq/bk/restore/data/oradata/aims/group_5.449.788744443
         6 /paic/hq/bk/restore/data/oradata/aims/group_6.268.788744443
         6 /paic/hq/bk/restore/data/oradata/aims/group_6.450.788744443
         7 /paic/hq/bk/restore/data/oradata/aims/group_7.271.789784501
         7 /paic/hq/bk/restore/data/oradata/aims/group_7.1047.789784501

50 rows selected.

SQL>
SQL> alter database drop logfile group 2;

Database altered.

SQL> alter database open resetlogs;

Database altered.