Concepts common to most database objects

Aliases
An alias is an alternative name for an object such as a module, table or another alias. It can be used to reference an object wherever that object can be referenced directly.

Soft invalidation of database objects
When soft invalidation is active, an object can be dropped even if other running transactions are using it. Transactions that were using the dropped object are permitted to continue, but any new transaction will be denied access to the dropped object.

Automatic revalidation of database objects
Automatic revalidation is a mechanism whereby invalid database objects are automatically revalidated when accessed at run time.

Creating and maintaining database objects
When creating some types of database objects, you should be aware of the CREATE with errors support, as well as the REPLACE option.