剛裝好11GR2?RAC一般需要將數據庫置于歸檔模式，并且enable flashback database。

這個步驟在以前是需要先設置cluster_database=false的，但11GR2已經變得非常簡單，就跟我們操作單實例是一樣的了。贊一下。

下面是一個例子，我將歸檔日志也放在了ASM上，RACTEST1的歸檔放在+DATA/ARC1下，RACTEST2的歸檔放到+DATA/ARC2下。

而Flashbask area是需要單獨的一個disk group的，所以特地給他創建了個新的DG -- HAOFLASH。

1. under ASM env:

SQL> conn / as sysasm
Connected.

SQL> CREATE DISKGROUP haoflash
? 2??? EXTERNAL REDUNDANCY
? 3??? DISK '/dev/raw/raw3';

Diskgroup created.

SQL> ALTER DISKGROUP?data?add directory '+DATA/ARC1';

Diskgroup altered.

SQL> ALTER DISKGROUP data add directory '+DATA/ARC2';

Diskgroup altered.

2. under?ORACLE?env:

SQL> alter system set log_archive_dest_1='location=+DATA/ARC1' scope=spfile sid='RACTEST1';

System altered.

SQL> alter system set log_archive_dest_1='location=+DATA/ARC2' scope=spfile sid='RACTEST2';

System altered.

SQL> alter system set db_recovery_file_dest_size = 4G scope=both sid='*';

System altered.

SQL> alter system set db_recovery_file_dest = '+HAOFLASH' scope=both sid='*';

System altered.

SQL> alter system set db_flashback_retention_target = 1440 scope=both sid='*';

System altered.

3. shutdown all instances:

on racnode1:
SQL>? shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

[oracle@racnode1 raw]$ srvctl status database -d RACTEST
Instance RACTEST1 is not running on node racnode1
Instance RACTEST2 is running on node racnode2

on racnode2:
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

這時可以看到節點2已經down了。

[oracle@racnode2 ~]$ srvctl status database -d RACTEST
Instance RACTEST1 is not running on node racnode1
Instance RACTEST2 is not running on node racnode2

[oracle@racnode2 ~]$ crs_stat -t -v|grep db
ora.ractest.db ora....se.type 0/2??? 0/1??? OFFLINE?? OFFLINE?

4.start mount one instance(eg, racnode1) and enable ARCHIVELOG and FLASHBACK

SQL> startup mount
ORACLE instance started.

Total System Global Area? 849530880 bytes
Fixed Size????????????????? 1339824 bytes
Variable Size???????????? 650120784 bytes
Database Buffers????????? 192937984 bytes
Redo Buffers??????????????? 5132288 bytes
Database mounted.

SQL> alter database archivelog;

Database altered.

SQL> alter database flashback on;

Database altered.

SQL> SELECT LOG_MODE,FLASHBACK_ON FROM V$DATABASE;

LOG_MODE???? FLASHBACK_ON
------------ ------------------
ARCHIVELOG?? YES

SQL> alter database open;

Database altered.

5.startup other instances

[oracle@racnode2 ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.1.0 Production on Thu Jun 24 16:37:52 2010

Copyright (c) 1982, 2009, Oracle.? All rights reserved.

Connected to an idle instance.

SQL> startup
ORACLE instance started.

Total System Global Area? 849530880 bytes
Fixed Size????????????????? 1339824 bytes
Variable Size???????????? 654315088 bytes
Database Buffers????????? 188743680 bytes
Redo Buffers??????????????? 5132288 bytes
Database mounted.
Database opened.

[oracle@racnode1 raw]$ crs_stat -t -v|grep db
ora.ractest.db ora....se.type 0/2??? 0/1??? ONLINE??? ONLINE??? racnode1?

[oracle@racnode1 raw]$ srvctl status database -d RACTEST
Instance RACTEST1 is running on node racnode1
Instance RACTEST2 is running on node racnode2

6.verify

on racnode1:
SQL> archive log list
Database log mode????????????? Archive Mode
Automatic archival???????????? Enabled
Archive destination??????????? +DATA/arc2
Oldest online log sequence???? 11
Next log sequence to archive?? 12
Current log sequence?????????? 12

on racnode2:
SQL> archive log list
Database log mode????????????? Archive Mode
Automatic archival???????????? Enabled
Archive destination??????????? +DATA/arc2
Oldest online log sequence???? 11
Next log sequence to archive?? 12
Current log sequence?????????? 12

SQL> alter system switch logfile;

System altered.

SQL> archive log list
Database log mode????????????? Archive Mode
Automatic archival???????????? Enabled
Archive destination??????????? +DATA/arc2
Oldest online log sequence???? 12
Next log sequence to archive?? 13
Current log sequence?????????? 13

SQL>? select THREAD#,SEQUENCE#,ARCHIVED from? v$archived_log;

?? THREAD#? SEQUENCE# ARC
---------- ---------- ---
???????? 2???????? 11 YES
???????? 2???????? 12 YES
????????
on racnode1:

SQL> alter system switch logfile;

System altered.

SQL> select THREAD#,SEQUENCE#,ARCHIVED from? v$archived_log;

?? THREAD#? SEQUENCE# ARC
---------- ---------- ---
???????? 2???????? 11 YES
???????? 2???????? 12 YES
???????? 1???????? 13 YES

總結

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