【11GR2 RAC】如何开启归档和FLASHBACK

刚装好11GR2 RAC一般需要将数据库置于归档模式，并且enable flashback database。

这个步骤在以前是需要先设置cluster_database=false的，但11GR2已经变得非常简单，就跟我们操作单实例是一样的了。赞一下。

下面是一个例子，我将归档日志也放在了ASM上，RACTEST1的归档放在+DATA/ARC1下，RACTEST2的归档放到+DATA/ARC2下。

而Flashbask area是需要单独的一个disk group的，所以特地给他创建了个新的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.

这时可以看到节点2已经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

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

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【11GR2 RAC】如何开启归档和FLASHBACK

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