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  • snapshot standby database

    快照备库接收和归档主库发送来的redo,但是不会应用;切换成physical standby之后会自动开启redo apply。
    快照standby不可以参加主备切换;在最大保护性模式下,如果只有一个备库,则不可以将备库转成snapshot standby。

    将Physical Standby Database转换成Snapshot Standby Database

    1.停止redo apply

    SQL> alter database recover managed standby database cancel;
    

    2.确保数据是mounted状态,而不是open状态

    SQL> select open_mode,database_role from v$database;
    
    OPEN_MODE            DATABASE_ROLE
    -------------------- ----------------
    MOUNTED              PHYSICAL STANDBY
    
    SQL> 
    

    3.确认已经创建好fast recovery area(不需要对数据库开启闪回)

    SQL> show parameter db_recovery_file
    
    NAME                                 TYPE        VALUE
    ------------------------------------ ----------- ------------------------------
    db_recovery_file_dest                string      /s01/app/oracle/flash
    db_recovery_file_dest_size           big integer 4G
    SQL> 
    

    4.执行转换

    SQL> alter database convert to snapshot standby ;
    
    Database altered.
    
    SQL> select open_mode,database_role from v$database;
    
    OPEN_MODE            DATABASE_ROLE
    -------------------- ----------------
    MOUNTED              SNAPSHOT STANDBY
    
    SQL>
    

    5.将数据打开

    SQL> alter database open;
    
    Database altered.
    
    #打开模式已经改变,但是角色不变
    SQL> select open_mode,database_role from v$database;
    
    OPEN_MODE            DATABASE_ROLE
    -------------------- ----------------
    READ WRITE           SNAPSHOT STANDBY
    
    SQL> 
    

    将Snapshot Standby Database切换成Physical Standby Database

    1.如果是RAC环境,要先关掉所有实例
    2.将数据库启动到mount状态
    3.执行切换

    SQL> select open_mode,database_role from v$database;
    
    OPEN_MODE            DATABASE_ROLE
    -------------------- ----------------
    MOUNTED              SNAPSHOT STANDBY
    
    SQL> alter database convert to physical standby;
    
    Database altered.
    
    #转换命令结束后,数据库会自动被dismounted,需要关闭重启数据库。
    SQL> select open_mode,database_role from v$database;
    select open_mode,database_role from v$database
                                        *
    ERROR at line 1:
    ORA-01507: database not mounted
    
    
    SQL> startup mount
    ORA-01081: cannot start already-running ORACLE - shut it down first
    SQL> shutdown immediate
    ORA-01507: database not mounted
    
    
    ORACLE instance shut down.
    SQL> startup mount
    ORACLE instance started.
    
    Total System Global Area  430075904 bytes
    Fixed Size                  2253944 bytes
    Variable Size             184552328 bytes
    Database Buffers          239075328 bytes
    Redo Buffers                4194304 bytes
    Database mounted.
    SQL> 
    
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  • 原文地址:https://www.cnblogs.com/abclife/p/5408000.html
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