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前言:

        Ogg集成模式降级为经典模式的场景比较少，因为降级为经典模式会导致无法支持压缩表同步，XA事务，多线程模式，PDB模式同步等功能，除非遇到集成模式暂时无法解决的bug或者环境不支持集成模式，比如DG备库环境

 

配置介绍:

OGG软件:19.1.0.0.4

       源端：

               extract :ext_text

               pump :pum_test

 

目标端:

        replicat:rep_test

replicat进程降级:

        1 关闭replicat进程

GGSCI> stop replicat rep_test

        2 删除集成复制的参数

GGSCI> edit params rep_test
--删除
DBOPTIONS INTEGRATEDPARAMS (MAX_SGA_SIZE 100, PARALLELISM 2)

        3 添加检查表

GGSCI> DBLOGIN userid ogg, password "go_20230_W506"
GGSCI> delete  CHECKPOINTTABLE ogg.REP_CHKPT 
GGSCI> ADD CHECKPOINTTABLE ogg.REP_CHKPT

        4 修改为经典复制模式

GGSCI> ALTER REPLICAT rep_test, NONINTEGRATED, CHECKPOINTTABLE ogg.REP_CHKPT 

        5 启动应用进程

GGSCI> start rep_test

        6 确认使用了经典模式

查看replicat进程信息已经没有没有INTEGRATED Replicat
​
GGSCI> info rep_test,detail
​
REPLICAT   REP_TEST  Last Started 2023-11-03 16:15   Status RUNNING
Checkpoint Lag       00:00:00 (updated 00:00:05 ago)
Process ID           20588
Log Read Checkpoint  File /u01/ogg/dirdat/ro0000000032023-11-03 16:24:31.583771  RBA 314432158
查询应用进程的数据字典也返回为空
GGSCI> select * from DBA_APPLY;
GGSCI> select * from DBA_GG_INBOUND_PROGRESS;

extract进程降级:

        1 关闭extract进程

GGSCI> STOP EXT_TEST

        2 确认当前进程是否可以进行downgrade,需要确保在downgrade之前的事务已经写入队列文件

GGSCI> DBLOGIN userid ogg, password "go_20230_W506"
GGSCI> INFO EXT_TEST DOWNGRADE
表示可以进行降级
Extract EXT_TEST is ready to be downgraded from integrated capture. Archive logs corresponding to SCN 8145010 and higher must be accessible by the downgraded extract.

        3 降级extract进程

注意如果是RAC 要写对应的threads数量
GGSCI>  alter EXT_TEST downgrade tranlog threads 2
​
Extract EXT_TEST successfully downgraded from integrated capture

        4 extract取消注册到数据库

GGSCI> UNREGISTER extract EXT_TEST DATABASE
2023-11-03 16:24:22  INFO    OGG-01750  Successfully unregistered EXTRACT EXT_TEST from database.

        5 删除集成模式的参数，添加经典模式参数tranlogoptions

删除集成模式的参数
TRANLOGOPTIONS INTEGRATEDPARAMS (MAX_SGA_SIZE 100, PARALLELISM 2)

        6 开启extract进程

GGSCI> START EXT_TEST

        7 确认使用了经典模式

GGSCI> info EXT_TEST 
​
EXTRACT    EXT_TEST  Last Started 2023-11-03 16:25   Status RUNNING
Checkpoint Lag       00:00:23 (updated 00:00:04 ago)
Process ID           17271
Log Read Checkpoint  Oracle Redo Logs2023-11-03 16:21:37  Thread 1, Seqno 256, RBA 2394476SCN 0.8145013 (8145013)
Log Read Checkpoint  Oracle Redo Logs2023-11-03 16:25:14  Thread 2, Seqno 163, RBA 272912SCN 0.8701078 (8701078)