在配置Dataguard时，执行命令发生下面的错误：
SQL> alter system set log_archive_dest_1='location=/u01/app/Oracle/flash_recovery_area/HYOMS/archivelog valid_for=(all_logfiles,all_roles) db_unique_name=hyoms01';
alter system set log_archive_dest_1='location=/u01/app/oracle/flash_recovery_area/HYOMS/archivelog valid_for=(all_logfiles,all_roles) db_unique_name=hyoms01'
*
ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-16053: DB_UNIQUE_NAME hyoms01 is not in the Data Guard Configuration

这是因为刚执行的alter system set db_unique_name='hyoms01' scope=spfile;还没有数据库识别到
需要重新启动数据库可以解决。
SQL> select * from V$DATAGUARD_CONFIG ;

DB_UNIQUE_NAME
------------------------------
hyoms
hyoms01
hyoms02
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup

SQL> select * from V$DATAGUARD_CONFIG ;

DB_UNIQUE_NAME
------------------------------
hyoms01
hyoms02
SQL> alter system set log_archive_dest_1='location=/u01/app/oracle/flash_recovery_area/HYOMS/archivelog valid_for=(all_logfiles,all_roles) db_unique_name=hyoms01';
System altered.

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