New ACCESSIBLE BY Clause: Oracle 12c

You might implement a database application as several PL/SQL packages—one package that provides the application programming interface (API) and helper packages to do the work. Ideally, only the API is accessible to clients.

Also, you might create a utility package to provide services to only some other PL/SQL units in the same schema. Ideally, the utility package is accessible only to the intended PL/SQL units.

Before Oracle Database 12c, PL/SQL could not prevent clients from using items exposed in helper packages. To isolate these items, you had to use relational database management system (RDBMS) security features. Some application deployment schemes made RDBMS security features hard to use.

As of Oracle Database 12c, each of these statements has an optional ACCESSIBLE BY clause that lets you specify a white list of PL/SQL units that can access the PL/SQL unit that you are creating or altering

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