Here are some of the things to keep in mind when dealing with OGG and 12c multitenant architecture.
- It is available only in integrated capture mode and not classic capture.
- One extract can be configured to capture changes from multiple PDBs
- Since we have to use integrated capture mode, a log mining server is involved and this is only accessible from the root container (CDB$ROOT).
- We have to connect as a common user to attach to the log mining server. For example a user called C##GGADMIN is what we are using in our example.
- There is a 3 part naming convention in GGSCI and Parameter file. For example Container Name.Schema.Table(or Sequence)
- The parameter SOURCECATALOG when used enables us to use the earlier Schema.Table type naming convention.
- Replicat can only connect and apply to one pluggable database.
- The dbms_goldengate_auth.grant_admin_privilege package grants the appropriate privileges for capture and apply within a multitenant container database. This includes the container parameter, which must be set to ALL, as shown in the following example:
dbms_goldengate_auth.grant_admin_privilege(‘C##GGADMIN’,container=>all)
由于oracle 12c已经是多租户架构，在使用OGG同步的时候，需要考虑下面一些情况
1. 抽取模式只能是integrated(集成)模式，不支持claasic capture传统方式捕获；
2. 一个 CDB包含多个PDB，源端部署的一个extract可访问所有pdb redo，理论上不需要每个pdb单独配置extract.
3. 因为要使用integrated extract，因此，需要能访问log mining server，而这个只能从cdb$root中访问；
4. 源端要使用common user，即c##ogg这种用户来访问源端DB，这样能访问DB的redo log & all pdbs。
5. 在GGSCI或参数文件中，可以使用pdb.schema.table来访问具体的表或序列；
6. 可以在参数文件 中使用sourceCatalog参数，指定一个PDB，后面的参数中只需要schema.table即可；
7. 目标端每个pdb要有一个replicat进程，即一个replicat进程只能投递到一个PDB，不能投递到多个。
8. 源 端OGG用户需要赋权：dbms_goldengate_auth.grant_admin_privilege(‘C##GGADMIN’,container=> ‘all’)，同时建议将ogg的用户设置赋权为：grant dba to c##ogg container=all;
9. 源端DB除了以前要打开归档, force logging, 最小附加日志，可能还需要打开一个开关：alter system set enable_goldengate_replication=true;
参考
Configuring Oracle GoldenGate in a Multitenant Container Database
http://docs.oracle.com/goldengate/1212/gg-winux/GIORA/config_containerdb.htm#GIORA942