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  • DG:三种模式切换

    应用归档日志方式进行数据同步
    SQL> alter system set log_archive_dest_2='SERVICE=standby arch noaffirm valid_for=(online_logfiles,primary_role) db_unique_name=standby' scope=spfile;
    
    应用在线日志方式进行数据同步
    SYNC:
    SQL> alter system set log_archive_dest_2='SERVICE=standby lgwr sync affirm valid_for=(online_logfiles,primary_role) db_unique_name=standby' scope=spfile;
    
    ASYNC:
    SQL> alter system set log_archive_dest_2='SERVICE=standby lgwr async noaffirm valid_for=(online_logfiles,primary_role) db_unique_name=standby';
    

     

    DG切换模式
    最大性能模式--切换到--&gt最大高可用 (MAXIMUM PERFORMANCE——>MAXIMUM AVAILABILITY)

    1.192.168.163.6:
    SQL> shutdown immediate

    2.192.168.163.18
    SQL> alter database recover managed standby database cancel;


    3.192.168.163.6
    SQL>
    SQL>
    SQL> startup mount

    SQL> alter database set standby database to maximize availability;

    SQL> alter system set log_archive_dest_2='SERVICE=PROD_STD LGWR SYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=PROD_STD' scope=spfile;

    System altered.

    4.192.168.163.18
    SQL> startup nomount;

    SQL> alter database mount standby database;

    SQL> alter system set log_archive_dest_2='SERVICE=PROD_STD LGWR SYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=PROD_STD' scope=spfile;

    SQL> shutdown immediate

    SQL> startup nomount

    SQL> alter database mount standby database;

    SQL> select open_mode,protection_mode,database_role,switchover_status from v$database;

    OPEN_MODE PROTECTION_MODE DATABASE_ROLE SWITCHOVER_STATUS
    -------------------- -------------------- ---------------- --------------------
    MOUNTED MAXIMUM AVAILABILITY PHYSICAL STANDBY NOT ALLOWED

    5.192.168.163.6
    SQL> shutdown immediate

    SQL> startup

    SQL> show parameter log_archive_dest_2

    NAME TYPE VALUE
    ------------------------------------ ----------- ------------------------------
    log_archive_dest_2 string SERVICE=PROD_STD LGWR SYNC VAL
    ID_FOR=(ONLINE_LOGFILES,PRIMAR
    Y_ROLE) DB_UNIQUE_NAME=PROD_ST
    D
    6.192.168.163.18
    SQL> alter database open;

    SQL> alter database recover managed standby database using current logfile disconnect from session;


    最大高可用--切换到--&gt最保护能模式 (MAXIMUM AVAILABILITY——>MAXIMUM PROTECTION)
    (因为最大可用模式和最大保护模式对应的参数都是LGWR和SYNC,所以不需要再改参数了)

    1.192.168.163.6
    SQL> shutdown immediate

    SQL> startup mount

    SQL> alter database set standby database to maximize protection;

    SQL> show parameter log_archive_dest_2

    NAME TYPE VALUE
    ------------------------------------ ----------- ------------------------------
    log_archive_dest_2 string SERVICE=PROD_STD LGWR SYNC VAL
    ID_FOR=(ONLINE_LOGFILES,PRIMAR
    Y_ROLE) DB_UNIQUE_NAME=PROD_ST
    D

    SQL> alter database open;

    2.192.168.163.18
    SQL> select open_mode,protection_mode,database_role,switchover_status from v$database;

    OPEN_MODE PROTECTION_MODE DATABASE_ROLE SWITCHOVER_STATUS
    -------------------- -------------------- ---------------- --------------------
    READ ONLY WITH APPLY MAXIMUM PROTECTION PHYSICAL STANDBY NOT ALLOWED


    最大保护模式转最大性能模式 (MAXIMUM PROTECTION——>MAXIMUM PERFORMANCE)
    (最大性能参数问LGWR、SYNC或者ASYNC或者ARCH、SYNC,因为上面已经改为LGWR、SYNC,可以不需要再设置了,直接转换)
    本文进行了转换将LGWR SYNC转换为LGWR ASYNC,最大性能模式

    1.192.168.163.6
    SQL> shutdown immediate

    2.192.168.163.18
    SQL> alter database recover managed standby database cancel;

    SQL> shutdown immediate

    3.192.168.163.6
    SQL> alter system set log_archive_dest_2='SERVICE=PROD_STD LGWR ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=PROD_STD' scope=spfile;

    4.192.168.163.18
    SQL> startup nomount

    SQL> alter database mount standby database;

    SQL> alter system set log_archive_dest_2='SERVICE=PROD_STD LGWR ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=PROD_STD' scope=spfile;

    5.192.168.163.6
    SQL> shutdown immediate

    SQL> startup

    SQL> select open_mode,protection_mode,database_role,switchover_status from v$database;

    OPEN_MODE PROTECTION_MODE DATABASE_ROLE SWITCHOVER_STATUS
    -------------------- -------------------- ---------------- --------------------
    READ WRITE MAXIMUM PERFORMANCE PRIMARY SESSIONS ACTIVE

    6.192.168.163.18
    SQL> shutdown immediate

    SQL> startup

    SQL> select open_mode,protection_mode,database_role,switchover_status from v$database;

    OPEN_MODE PROTECTION_MODE DATABASE_ROLE SWITCHOVER_STATUS
    -------------------- -------------------- ---------------- --------------------
    READ ONLY MAXIMUM PERFORMANCE PHYSICAL STANDBY NOT ALLOWED

    主备切换日志验证同步

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  • 原文地址:https://www.cnblogs.com/houzhiheng/p/14741605.html
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