数据库：oracle 11.2.0.4
系统：CentOS 7.9
问题描述：设置log_archive_dest时报错ORA-16018，如下所示：
SQL> alter system set log_archive_dest='/u01/app/oracle/oradata/orclsou/arch';
alter system set log_archive_dest='/u01/app/oracle/oradata/orclsou/arch'
*
ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-16018: cannot use LOG_ARCHIVE_DEST with LOG_ARCHIVE_DEST_n or DB_RECOVERY_FILE_DEST
说明：归档目录默认存放于db_recovery_file_dest指定的闪回恢复区，
如果设置了db_recovery_file_dest,就不能设置log_archive_dest.
log_archive_dest与log_archive_dest_n或db_recovery_file_dest不能一起使用
log_archive_dest_1为指定归档目录，此处对应 /bdmeddoc/archivelog
log_archive_dest_2参数配置错误会导致主备库切换后新主库无法传文件到新备库
解决方案：
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 1
Next log sequence to archive 3
Current log sequence 3
SQL> alter system set log_archive_dest_1='location=/u01/app/oracle/oradata/orclsou/arch';
System altered.
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /u01/app/oracle/oradata/orclsou/arch
Oldest online log sequence 1
Next log sequence to archive 3
Current log sequence 3
SQL> select open_mode from v$database;
OPEN_MODE
----------
MOUNTED
如上，成功修改归档目录.
