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  • ORACLE Physical Standby DG 之fail over

    SQL> select thread#, low_sequence#, high_sequence# from v$archive_gap;
    确认下是否存在日志间隙,发现gap现象,说明failover不会有数据损失情况。
    在standby端,关闭apply和结束应用动作

    SQL> alter database recover managed standby database cancel;
    数据库已更改。

    SQL> alter database recover managed standby database finish;
    数据库已更改。

    SQL> select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;
    NAME LOG_MODE OPEN_MODE DATABASE_ROLE SWITCHOVER_STATUS DB_UNIQUE_NAME
    --------- ------------ -------------------- ---------------- -------------------- ------------------------------
    PROD ARCHIVELOG READ ONLY PHYSICAL STANDBY TO PRIMARY orcl

    SQL> alter database commit to switchover to primary with session shutdown;
    数据库已更改。

    SQL> select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;

    NAME LOG_MODE OPEN_MODE DATABASE_ROLE SWITCHOVER_STATUS DB_UNIQUE_NAME
    --------- ------------ -------------------- ---------------- -------------------- ------------------------------
    PROD ARCHIVELOG MOUNTED PRIMARY NOT ALLOWED orcl


    SQL> alter database open;
    数据库已更改。

    SQL> select name, LOG_MODE, OPEN_MODE, database_role, SWITCHOVER_STATUS, db_unique_name from v$database;
    NAME LOG_MODE OPEN_MODE DATABASE_ROLE SWITCHOVER_STATUS DB_UNIQUE_NAME
    -------- ------------ -------------------- ---------------- -------------------- ------------------------------
    PROD ARCHIVELOG READ WRITE PRIMARY RESOLVABLE GAP orcl

    SQL>

    参考:https://www.cnblogs.com/lhrbest/p/4680273.html

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  • 原文地址:https://www.cnblogs.com/elontian/p/9675050.html
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