2014-03-08 Created By BaoXinjian
一、摘要
1. 不支持和有限支持的DDL类型
(1). Oracle数据库保留的Schema，GoldenGate是不支持的，如SYS、SYSTEM、PUBLIC等等
(2). GoldenGate10g DDL不支持Oracle回收站功能
(3). GoldenGate支持不超高2M长度的DDL语句
(4). GoldenGate只支持单向的DDL复制，不支持双向的DDL复制
(5). GoldenGate只支持源端和目标端结构一直的
2. DDL处理方法
(1). 不支持DDL类型的处理方法
a. 不支持的Schema，OGG默认不复制，不许更多设定
b. 关闭Oracle回收站：alter system set recyclebin=off scope=both
(2). 受限支持DDL类型的处理费方法
a. 通过脚本ddl_ddl2file.sql获取被忽略的Oracle DDL操作，将其获取的操作放在USER_DUMP_DEST目录一个文本文件中
b. 投递过程中必须使用ASSUMETARGETDEFS参数
3. DDL复制的配置
(1). Oracle DDL复制的原理
(2). 安装GoldenGate DDL对象
(3). 配置DDL支持
(4). DDL异常与错误处理
二、Oracle DDL复制的原理
1. DDL复制原理
基于数据库全局Trigger的复制，在源数据建立一个Oracle全库级别的Trigger捕捉DDL操作到中间表，Extract读取中间表DDL语句并与DML语句根据csn排序，Pump投递到目标端，目标端Replicat在重现该DDL语句
2. DDL复制和DML复制的区别
(1). DDL复制是基于Trigger
(2). DML复制是基于日志
(3). 只是在主Extract进程中通过scn号安装发生顺序进行组装，保证DDL操作和DML操作按照原来的顺序之下你给
3. DDL复制和DML复制的关系
DDL复制和DML复制可以项目独立，可以只启动DDL复制，也可以只启动DML复制，相互并不影响，他们之间只是在Extract进行组装时根据scn号进行排序
三、安装GoldenGate DDL对象
Step1. 停止Extract进程组
[ggate@gavinprod ~]$ cd $GGATE
[ggate@gavinprod ggate]$ ./ggsci
Oracle GoldenGate Command Interpreter for Oracle
Version 11.2.1.0.1 OGGCORE_11.2.1.0.1_PLATFORMS_120423.0230_FBO
Linux, x64, 64bit (optimized), Oracle 11g on Apr 23 2012 08:32:14
Copyright (C) 1995, 2012, Oracle and/or its affiliates. All rights reserved.
GGSCI (gavinprod.com) 1> stop E*
EXTRACT EXT1 is already stopped.
EXTRACT EXT2 is already stopped.
Step2. 指定源端数据库的模式
GGSCI (gavinprod.com) 2> edit params ./GLOBALS
GGSCHEMA ggate
Step3. 停止Manager进程
GGSCI (gavinprod.com) 5> stop MGR !
Manager is already stopped.
Step4. 关闭Oracle的recyclebin
[oracle@gavinprod bin]$ sqlplus '/as sysdba'
SQL*Plus: Release 11.2.0.1.0 Production on Fri Jan 30 22:50:10 2015
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to an idle instance.
SQL> show parameter recyclebin
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
recyclebin string OFF
SQL> alter system set recyclebin = off scope = both;
Step5. 安装DDL对象
[oracle@gavinprod ggate]$ sqlplus '/as sysdba' SQL*Plus: Release 11.2.0.1.0 Production on Fri Jan 30 22:54:49 2015 Copyright (c) 1982, 2009, Oracle. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> @/opt/oracle/ggate/marker_setup.sql
SQL> @/opt/oracle/ggate/ddl_setup.sql
SQL> @/opt/oracle/ggate/role_setup.sql
SQL> @/opt/oracle/ggate/ddl_enable.sql
Step6. 验证DDL对象
[oracle@gavinprod ggate]$ sqlplus '/as sysdba'
SQL*Plus: Release 11.2.0.1.0 Production on Fri Jan 30 22:54:49 2015
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> @/opt/oracle/ggate/marker_status.sql
四、配置DDL支持
Step1. 停止Extract 和 Replicat进程组
--Extract 端
GGSCI (gavinprod.com) 1> stop E*
EXTRACT EXT1 is already stopped.
EXTRACT EXT2 is already stopped.
GGSCI (gavinprod.com) 2> stop D*
EXTRACT DMP2 is already stopped.
--Replicat 端
GGSCI (odellprod.com) 1> stop R*
REPLICAT REP1 is already stopped.
REPLICAT REP2 is already stopped.
Step2. 修改Extract配置文件
GGSCI (gavinprod.com) 6> view params EXT2
extract ext2
userid ggate@gavinprod, password oracle
exttrail /opt/oracle/ggate/dirdat/ld
DDL INCLUDE ALL
DDLOPTIONS ADDTRANDATA, REPORT
table source_prod.*;
Step3. 修改Replicat配置文件
GGSCI (odellprod.com) 2> view params REP2
replicat rep2
ASSUMETARGETDEFS
userid ggate@odellprod,password oracle
discardfile /opt/oracle/ggate/dirdat/rep2_discard.txt, append, megabytes 10
DDL INCLUDE MAPPED
DDLOPTIONS REPORT
map source_prod.*, target target_prod.*;
Step4. 重启进程
--Extract 端
GGSCI (gavinprod.com) 1> start E*
GGSCI (gavinprod.com) 2> start D*
--Replicat 端
GGSCI (odellprod.com) 1> start R*
Step5. 验证结果
1. 目标端建立table bxj_ogg_ddl
create table bxj_ogg_ddl (id number, name varchar2 (100) );
2. 目标端查看所创建的table是否存在
select * from dba_objects where object_name = 'BXJ_OGG_DDL';
3. 如果存在，测试成功
Thanks and Regards
