在ASM單機環境下，開啟歸檔的最簡單的方法。
環境：oracle11g? 11.2.0.4

?

登陸sqlplus
[oracle@udevasm ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Thu Jun 8 18:20:41 2017

Copyright (c) 1982, 2013, Oracle.? All rights reserved.

Connected to an idle instance.

要把Oracle數據庫給啟動到Open狀態

SQL> startup
ORACLE instance started.

Total System Global Area 1068937216 bytes
Fixed Size?? ??? ???? 2260088 bytes
Variable Size?? ??? ?? 331350920 bytes
Database Buffers?? ?? 729808896 bytes
Redo Buffers?? ??? ???? 5517312 bytes
Database mounted.
Database opened.

查看ASM空間使用率
SQL>? select group_number,name,total_mb,free_mb from v$asm_diskgroup;

GROUP_NUMBER NAME?? ??? ??? ?????? TOTAL_MB?? ?? FREE_MB
------------ ------------------------------ ---------- ----------
?? ??? 1 DGDATA01?? ??? ??? ??? ? 22520?? ?????? 260
?? ??? 2 DGDATA02?? ??? ??? ??? ? 20472?? ???? 14132
?? ??? 3 DGRECOVERY ?? ??? ??? ? 21500?? ???? 21420
?? ??? 4 DGSYSTEM?? ??? ??? ??? ? 20472?? ???? 20392
?? ??? 5 GRID1?? ??? ??? ??? ? 10232?? ???? 10144

查看歸檔狀態
SQL> archive log list;
Database log mode?? ??????? No Archive Mode
Automatic archival?? ??????? Disabled
Archive destination?? ??????? /oracle/app/oracle/product/11.2.0/dbs/arch
Oldest online log sequence???? 9
Current log sequence?? ??????? 14

SQL> show user
USER is "SYS"

關庫，或使用命令：shutdown immediate來關閉
SQL> shutdown?? ?immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

啟庫到mount
SQL> startup mount;
ORACLE instance started.

Total System Global Area 1068937216 bytes
Fixed Size?? ??? ???? 2260088 bytes
Variable Size?? ??? ?? 331350920 bytes
Database Buffers?? ?? 729808896 bytes
Redo Buffers?? ??? ???? 5517312 bytes
Database mounted.

查看當前節點的狀態
SQL> select status from gv$instance;

STATUS
------------
MOUNTED

為節點開啟歸檔，開啟歸檔
SQL> alter database archivelog;

Database altered.

查看歸檔狀態，發現歸檔日志路徑不對，并不是默認的路徑在ASM中的路徑

SQL> archive log list;
Database log mode?? ??????? Archive Mode
Automatic archival?? ??????? Enabled
Archive destination?? ??????? /oracle/app/oracle/product/11.2.0/dbs/arch
Oldest online log sequence???? 9
Next log sequence to archive?? 14
Current log sequence?? ??????? 14

修改歸檔路徑

SQL>? ALTER SYSTEM SET LOG_ARCHIVE_DEST_1='LOCATION=+DGRECOVERY/' SCOPE=SPFILE SID='udevasm';?

查看當前修改后路徑

SQL> archive log list;
Database log mode?? ??????? Archive Mode
Automatic archival?? ??????? Enabled
Archive destination?? ??????? +DGRECOVERY/arc
Oldest online log sequence???? 9
Next log sequence to archive?? 14
Current log sequence?? ??????? 14

節點啟庫
SQL> alter database open;

Database altered.

SQL> select status from v$instance;

STATUS
------------
OPEN

來看一下，歸檔路徑的信息，默認是直接指向了ASM中的路徑
SQL> show parameter log_archive_dest;

NAME?? ??? ??? ??? ????? TYPE?? ? VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest?? ??? ????? string
log_archive_dest_1?? ??? ????? string?? ? LOCATION=+DGRECOVERY/ARC
log_archive_dest_10?? ??? ????? string
log_archive_dest_11?? ??? ????? string
log_archive_dest_12?? ??? ????? string
log_archive_dest_13?? ??? ????? string
log_archive_dest_14?? ??? ????? string
log_archive_dest_15?? ??? ????? string
log_archive_dest_16?? ??? ????? string
log_archive_dest_17?? ??? ????? string
log_archive_dest_18?? ??? ????? string

?

到ASM下看一下歸檔文件
ASMCMD> lsdg
State??? Type??? Rebal? Sector? Block?????? AU? Total_MB? Free_MB? Req_mir_free_MB? Usable_file_MB? Offline_disks? Voting_files? Name
MOUNTED? EXTERN? N???????? 512?? 4096? 4194304???? 22520????? 260??????????????? 0???????????? 260????????????? 0???????????? N? DGDATA01/
MOUNTED? EXTERN? N???????? 512?? 4096? 4194304???? 20472??? 14132??????????????? 0?????????? 14132????????????? 0???????????? N? DGDATA02/
MOUNTED? EXTERN? N???????? 512?? 4096? 4194304???? 21500??? 21420??????????????? 0?????????? 21420????????????? 0???????????? N? DGRECOVERY/
MOUNTED? EXTERN? N???????? 512?? 4096? 4194304???? 20472??? 20392??????????????? 0?????????? 20392????????????? 0???????????? N? DGSYSTEM/
MOUNTED? EXTERN? N???????? 512?? 4096? 4194304???? 10232??? 10144??????????????? 0?????????? 10144????????????? 0???????????? N? GRID1/

SMCMD> cd 2017_06_08/
ASMCMD> l
thread_1_seq_14.256.946154499
thread_1_seq_15.257.946154499
thread_1_seq_16.258.946154499
thread_1_seq_17.259.946154499
thread_1_seq_18.260.946154501
thread_1_seq_19.261.946154523
thread_1_seq_20.262.946154571