Oracle 12C 新特性：CDB 与 PDB

今天抽空了解了下 Oracle12C 的新特性之一： CDB 与 PDB，Oracle 12C 开始引入多租户的概念，允许 CDB(数据库容器)上支持多个 PDB(可挺拔数据库)，结构如下：

Components of a CDB

A CDB includes the following components:

• Root

  The root, namedCDB$ROOT, stores Oracle-supplied metadata and common users. An example of metadata is the source code for Oracle-supplied PL/SQL packages. A common user is a database user known in every container. A CDB has exactly one root.

• Seed

  The seed, namedPDB$SEED, is a template that you can use to create new PDBs. You cannot add objects to or modify objects in the seed. A CDB has exactly one seed.

• PDBs

  A PDB appears to users and applications as if it were a non-CDB. For example, a PDB can contain the data and code required to support a specific application. A PDB is fully backward compatible with Oracle Database releases before Oracle Database 12c.

这篇文章介绍得比较详细：http://www.cnblogs.com/kerrycode/p/3386917.html，

参考

Overview of Managing a Multitenant Environment