逻辑Standby之failover

1.检查及处理丢失的文档 ORCLLDG_PRI select max(sequence#) from v$archived_log; MAX(SEQUENCE#) -------------- 9 ORCL_STD select sequence#,applied from dba_logstdby_log; SEQUENCE# APPLIED ---------- -------- 6 YES 7 YES 8 YES 9 CURRENT 若查询

1.检查及处理丢失的文档
ORCLLDG_PRI >select max(sequence#) from v$archived_log;

MAX(SEQUENCE#)
--------------
9
ORCL_STD >select sequence#,applied from dba_logstdby_log;

SEQUENCE# APPLIED
---------- --------
6 YES
7 YES
8 YES
9 CURRENT

若查询结果不同，需要手工复制这些文件到待转换的逻辑Standby端，然后注册（alter database register logical logfile '文件路径'）。
2.检查日志应用
SQL> select applied_scn,latest_scn from v$logstdby_progress;

APPLIED_SCN LATEST_SCN
----------- ----------
1165355 1165360

不一致，启动逻辑Standby的SQL应用……

3.激活新的Primary数据库

SQL> select database_role,force_logging from v$database;

DATABASE_ROLE FOR
---------------- ---
LOGICAL STANDBY YES

SQL> alter database activate logical standby database finish apply;

Database altered.

SQL> select database_role,force_logging from v$database;

DATABASE_ROLE FOR
---------------- ---
PRIMARY YES

SQL> select * from scott.test;

ID
----------
1
2
3
5
4
角色转换成功，逻辑Standby已经成功转换为Primary。但是，原来的Data Guard配置就失效了，环境脆弱。