Oracle 11G Active DataGuard角色切换
1.切换前准备：
1.1主库检查：
1.1.1 FAL检查
SQL> show parameter fal;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
fal_client string
fal_server string
SQL> alter system set fal_client='pri_1522';
SQL> alter system set fal_server='std_1522';
SQL> show parameter fal;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
fal_client string pri_1522
fal_server string std_1522
1.1.2 Standby文件自动管理
SQL> show parameter standby_file_management;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
standby_file_management string MANUAL
SQL> alter system set standby_file_management='auto';
SQL> show parameter standby_file_management;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
standby_file_management string auto
1.1.3 Convert参数设定
设定数据文件、重做日志转换目录
SQL> show parameter convert;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert string /u01/app/oradata/testdb, /u01/
app/oradata/testdb
log_file_name_convert string /u01/app/archivelog/testdb, /u
01/app/archivelog/testdb
1.1.4 Log_archive_dest参数
SQL> show parameter log_archive_dest_1;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_1 string location=/u01/app/archivelog/t
estdb valid_for=(all_logfiles,
all_roles) db_unique_name=pri_
db
SQL> show parameter log_archive_dest_2;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2 string service=std_1522 lgwr sync val
id_for=(online_logfiles,primar
y_role) db_unique_name=std_db
1.2备库检查
1.2.1 FAL检查
SQL> show parameter fal;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
fal_client string std_1522
fal_server string pri_1522
1.2.2 Standby文件自动管理
SQL> show parameter standby_file_management;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
standby_file_management string auto
1.2.3 Convert参数设定
SQL> show parameter convert;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_file_name_convert string /u01/app/oradata/testdb, /u01/
app/oradata/testdb
log_file_name_convert string /u01/app/archivelog/testdb, /u
01/app/archivelog/testdb
1.2.4 Log_archive_dest参数
SQL> show parameter log_archive_dest_1;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_1 string location=/u01/app/archivelog/t
estdb valid_for=(all_logfiles,
all_roles) db_unique_name=std_
db
SQL> show parameter log_archive_dest_2;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
log_archive_dest_2 string service=pri_1522 lgwr sync val
id_for=(online_logfiles,primar
y_role) db_unique_name=pri_db
1.2.5 确定日志归档、force logging打开
SQL> SELECT log_mode, force_logging, open_mode FROM v$database;
LOG_MODE FOR OPEN_MODE
------------ --- --------------------
ARCHIVELOG YES READ ONLY
2.主库切换成物理备库
2.1检查主库状态
2.1.1切换前查看主库是否有GAP
SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS OPEN_MODE PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- -------------------- --------------------
PRIMARY RESOLVABLEGAP READ WRITE MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
SQL> SELECT status, gap_status, dest_id FROM v$archive_dest_status WHERE dest_id=2;
STATUS GAP_STATUS DEST_ID
--------- ------------------------ ----------
VALID RESOLVABLE GAP 2
2.1.2有GAP，进行一次日志切换
SQL> alter system switch logfile;
SQL> SELECT status, gap_status, dest_id FROM v$archive_dest_status WHERE dest_id=2;
STATUS GAP_STATUS DEST_ID
--------- ------------------------ ----------
VALID NO GAP 2
SQL> SELECT database_role, switchover_status, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- --------------------
PRIMARY TOSTANDBY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
2.2备库的状态
SQL> SELECT switchover_status, database_role, open_mode, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS OPEN_MODE PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- -------------------- --------------------
PHYSICAL STANDBY NOT ALLOWED READ ONLY WITH APPLY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
2.3备库取消应用日志
SQL> alter database recover managed standby database cancel;
SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS OPEN_MODE PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- -------------------- --------------------
PHYSICAL STANDBY SWITCHOVER PENDING READ ONLY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
2.4主库切换成物理备库
SQL> alter database commit to switchover to physical standby with session shutdown;
SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;
SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database
*
ERROR at line 1:
ORA-01507: database not mounted
2.5原备库切换成新主库
2.5.1查看状态
SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS OPEN_MODE PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- -------------------- --------------------
PHYSICAL STANDBY SWITCHOVER PENDING READ ONLY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
2.5.2原备库需要应用日志（因原主库已发生切换产生了日志）
SQL> alter database recover managed standby database disconnect;
SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS OPEN_MODE PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- -------------------- --------------------
PHYSICAL STANDBY TO PRIMARY READ ONLY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
2.5.3原备库切换成新主库
SQL> alter database commit to switchover to primary;
SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS OPEN_MODE PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- -------------------- --------------------
PRIMARY NOTALLOWED MOUNTED MAXIMUM PERFORMANCE UNPROTECTED
2.5.4新主库（原备库）置为open状态：
SQL> alter database open;
SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS OPEN_MODE PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- -------------------- --------------------
PRIMARY FAILED DESTINATION READ WRITE MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
到此原备库已经切换成新的主库了，原主库已切换成新备库并关闭。
3.新备库管理
3.1启动新备库，并置于mount状态
由于原主库切换时已经关闭，需要重启实例，并置于mount状态：
SQL> ! ps -ef | grep ora_
oracle 28136 1 011:10 ? 00:00:01 ora_pmon_testdb
oracle 28138 1 011:10 ? 00:00:00 ora_vktm_testdb
oracle 28142 1 011:10 ? 00:00:00 ora_gen0_testdb
oracle 28144 1 011:10 ? 00:00:00 ora_diag_testdb
oracle 28146 1 011:10 ? 00:00:00 ora_dbrm_testdb
oracle 28148 1 011:10 ? 00:00:00 ora_psp0_testdb
oracle 28150 1 011:10 ? 00:00:01 ora_dia0_testdb
oracle 28152 1 011:10 ? 00:00:02 ora_mman_testdb
oracle 28154 1 011:10 ? 00:00:00 ora_dbw0_testdb
oracle 28156 1 011:10 ? 00:00:01 ora_lgwr_testdb
oracle 28158 1 011:10 ? 00:00:01 ora_ckpt_testdb
oracle 28160 1 011:10 ? 00:00:01 ora_smon_testdb
oracle 28162 1 011:10 ? 00:00:00 ora_reco_testdb
oracle 28164 1 011:10 ? 00:00:01 ora_mmon_testdb
oracle 28166 1 011:10 ? 00:00:00 ora_mmnl_testdb
oracle 28290 1 011:25 ? 00:00:00 ora_s001_testdb
oracle 28292 1 011:25 ? 00:00:00 ora_d000_testdb
oracle 28299 18875 0 11:29 pts/0 00:00:00 /bin/bash -c ps -ef | grep ora_
oracle 28301 28299 0 11:29 pts/0 00:00:00 grep ora_
SQL> shutdown immediate;
ORA-01507: database not mounted
ORACLE instance shut down.
SQL> startup mount;
3.2新备库应用日志：
SQL> alter database recover managed standby database using current logfile disconnect from session;
SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS OPEN_MODE PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- -------------------- --------------------
PHYSICAL STANDBY TO PRIMARY MOUNTED MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
3.3新备库状态置为open：
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-10456: cannotopen standby database; media recovery session may be in progress
SQL> alter database recover managed standby database cancel;
SQL> alter database open;
此处报错是因为备库在应用日志
3.4新备库应用日志：
3.4.1创建standby日志组
如果不创建standby日志组，应用日志会报错。
SQL> alter database recover managed standby database using current logfile disconnect from session;
alter database recover managed standby database using current logfile disconnect from session
*
ERROR at line 1:
ORA-38500: USING CURRENT LOGFILE option not available without standby redo logs
建立Standby log来应用来自主库（原备库）日志（11G新特性redo only with apply）
SQL> alter database add standby logfile thread 1 group 4 '/u01/app/oradata/testdb/stdredo04.rdo' size 50m;
SQL> alter database add standby logfile thread 1 group 5 '/u01/app/oradata/testdb/stdredo05.rdo' size 50m;
SQL> alter database add standby logfile thread 1 group 6 '/u01/app/oradata/testdb/stdredo06.rdo' size 50m;
SQL> alter database add standby logfile thread 1 group 7 '/u01/app/oradata/testdb/stdredo07.rdo' size 50m;
SQL> column member format a50;
SQL> SELECT * FROM v$logfile order by group#;
GROUP# STATUS TYPE MEMBER IS_
---------- ------- ------- --------------------------------------------- ---
1 ONLINE /u01/app/oradata/testdb/redo01.rdo NO
2 ONLINE /u01/app/oradata/testdb/redo02.rdo NO
3 ONLINE /u01/app/oradata/testdb/redo03.rdo NO
4 STANDBY /u01/app/oradata/testdb/stdredo04.rdo NO
5 STANDBY /u01/app/oradata/testdb/stdredo05.rdo NO
6 STANDBY /u01/app/oradata/testdb/stdredo06.rdo NO
7 STANDBY /u01/app/oradata/testdb/stdredo07.rdo NO
3.4.2新备库应用日志
SQL> alter database recover managed standby database using current logfile disconnect from session;
SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS OPEN_MODE PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- -------------------- --------------------
PHYSICAL STANDBY NOT ALLOWED READ ONLY WITH APPLY MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
4状态检查及数据验证
4.1新主库检查
当新备库（原主库）启动正常时，新主库状态就正常了。
4.1.1检查新主库是否有GAP
SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS OPEN_MODE PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- -------------------- --------------------
PRIMARY RESOLVABLE GAP READ WRITE MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
SQL> alter system switch logfile;
SQL> SELECT database_role, switchover_status, open_mode, protection_mode, protection_level FROM v$database;
DATABASE_ROLE SWITCHOVER_STATUS OPEN_MODE PROTECTION_MODE PROTECTION_LEVEL
---------------- -------------------- -------------------- -------------------- --------------------
PRIMARY TOSTANDBY READ WRITE MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
4.2数据验证
4.2.1新主库建表，并插入数据
SQL> SELECT username, account_status FROM dba_users WHERE username='HR';
USERNAME ACCOUNT_STATUS
------------------------------ --------------------------------
HR OPEN
SQL> create table hr.table2(id int, name varchar2(20));
SQL> insert into hr.table2 values (01, 'Active DataGuard');
1 row created.
SQL> SELECT * FROM hr.table2;
ID NAME
---------- --------------------
1 Active DataGuard
SQL> commit;
4.2.2新备库（原主库）验证
SQL> SELECT * FROM hr.table2;
ID NAME
---------- --------------------
1 Active DataGuard
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Oracle 11G Active DataGuard角色切换
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