前提：归档开启，默认不指定归档目录。
今晚遇到客户那里设置了闪回区和log_archive_dest，不停库做DG时，无法指定log_archive_dest_n参数，巨坑。。实验了下，结论如下：
数据库版本:ORACLE10.2.0.1
1.未设置闪回区时，可以动态配置log_archive_dest或log_archive_dest_1
2.配置闪回区时，不可以动态配置log_archive_dest
3.配置了闪回区和log_archive_dest后，不可动态配置log_archive_dest或log_archive_dest_1
1.未设置闪回区时，可以动态配置log_archive_dest或log_archive_dest_1
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
SQL> show parameter log_archive
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_config string
log_archive_dest string /home/oracle/
log_archive_dest_1 string
log_archive_dest_10 string
log_archive_dest_2 string
log_archive_dest_3 string
log_archive_dest_4 string
log_archive_dest_5 string
log_archive_dest_6 string
log_archive_dest_7 string
log_archive_dest_8 string
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_9 string
log_archive_dest_state_1 string enable
log_archive_dest_state_10 string enable
log_archive_dest_state_2 string enable
log_archive_dest_state_3 string enable
log_archive_dest_state_4 string enable
log_archive_dest_state_5 string enable
log_archive_dest_state_6 string enable
log_archive_dest_state_7 string enable
log_archive_dest_state_8 string enable
log_archive_dest_state_9 string enable
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_duplex_dest string
log_archive_format string %t_%s_%r.dbf
log_archive_local_first boolean TRUE
log_archive_max_processes integer 2
log_archive_min_succeed_dest integer 1
log_archive_start boolean FALSE
log_archive_trace integer 0
SQL> alter system set log_archive_dest=‘‘;
System altered.
SQL> show parameter recover
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string
db_recovery_file_dest_size big integer 0
recovery_parallelism integer 0
2.配置闪回区时，不可以动态配置log_archive_dest
SQL> show parameter log_archive
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_config string
log_archive_dest string
log_archive_dest_1 string
log_archive_dest_10 string
log_archive_dest_2 string
log_archive_dest_3 string
log_archive_dest_4 string
log_archive_dest_5 string
log_archive_dest_6 string
log_archive_dest_7 string
log_archive_dest_8 string
log_archive_dest_9 string
log_archive_dest_state_1 string enable
log_archive_dest_state_10 string enable
log_archive_dest_state_2 string enable
log_archive_dest_state_3 string enable
log_archive_dest_state_4 string enable
log_archive_dest_state_5 string enable
log_archive_dest_state_6 string enable
log_archive_dest_state_7 string enable
log_archive_dest_state_8 string enable
log_archive_dest_state_9 string enable
log_archive_duplex_dest string
log_archive_format string %t_%s_%r.dbf
log_archive_local_first boolean TRUE
log_archive_max_processes integer 2
log_archive_min_succeed_dest integer 1
log_archive_start boolean FALSE
log_archive_trace integer 0
SQL> alter system set log_archive_dest=‘/home/oracle/‘;
----不可动态修改
alter system set log_archive_dest=‘/home/oracle/‘
*
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
SQL> alter system set log_archive_dest_1=‘location=/home/oracle/‘; -----可动态修改
System altered.
SQL> alter system set log_archive_dest_1=‘‘;
System altered.
SQL> alter system set log_archive_dest=‘/home/oracle/‘ scope=spfile;
3.配置了闪回区和log_archive_dest后，不可动态配置log_archive_dest或log_archive_dest_1
SQL> startup
ORACLE instance started.
Total System Global Area 524288000 bytes
Fixed Size 1220360 bytes
Variable Size 150995192 bytes
Database Buffers 369098752 bytes
Redo Buffers 2973696 bytes
Database mounted.
Database opened.
SQL> show parameter log_archive_dest
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest string /home/oracle/
log_archive_dest_1 string
log_archive_dest_10 string
log_archive_dest_2 string
log_archive_dest_3 string
log_archive_dest_4 string
log_archive_dest_5 string
log_archive_dest_6 string
log_archive_dest_7 string
log_archive_dest_8 string
log_archive_dest_9 string
log_archive_dest_state_1 string enable
log_archive_dest_state_10 string enable
log_archive_dest_state_2 string enable
log_archive_dest_state_3 string enable
log_archive_dest_state_4 string enable
log_archive_dest_state_5 string enable
log_archive_dest_state_6 string enable
log_archive_dest_state_7 string enable
log_archive_dest_state_8 string enable
log_archive_dest_state_9 string enable
SQL> alter system set log_archive_dest_1=‘location=/home/oracle/‘; ------不可动态修改
alter system set log_archive_dest_1=‘location=/home/oracle/‘
*
ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-16019: cannot use LOG_ARCHIVE_DEST_1 with LOG_ARCHIVE_DEST or
LOG_ARCHIVE_DUPLEX_DEST
SQL> alter system set log_archive_dest=‘‘; ------不可动态修改
alter system set log_archive_dest=‘‘
*
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
做dg时遇到的log_archive_dest、log_archive_dest_1、db_recovery_file_dest之间互相影响