Database Objects

Schema Objects

A schema is a collection of logical structures of data, or schema objects. A schema is owned by a database user and has the same name as that user. Each user owns a single schema. Schema objects can be created and manipulated with SQL and include the following types of objects:

Clusters
Constraints
Database links
Database triggers
Dimensions
External procedure libraries
Index-organized tables
Indexes
Indextypes
Java classes, Java resources, Java sources
Materialized views
Materialized view logs
Mining models
Object tables
Object types
Object views
Operators
Packages
Sequences
Stored functions, stored procedures
Synonyms
Tables
Views

Nonschema Objects

Other types of objects are also stored in the database and can be created and manipulated with SQL but are not contained in a schema:

Contexts
Directories
Editions
Restore points
Roles
Rollback segments
Tablespaces
Users

In this reference, each type of object is described in Chapter 10 through Chapter 19, in the section devoted to the statement that creates the database object. These statements begin with the keyword CREATE. For example, for the definition of a cluster, see CREATE CLUSTER.

You must provide names for most types of database objects when you create them. These names must follow the rules listed in the sections that follow.