Schema and Non-Schema Objects in Oracle Database

Oracle database contains schema objects like views, tables, triggers etc., and several other types of objects which are also stored in the database but are not contained in a schema.

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




Types of Schema Objects

Schema objects are logical data storage structures which do not have a one-to-one correspondence to physical files on disk that store their information. However, Oracle Database stores a schema object logically within a tablespace of the database. The data of each object is physically contained in one or more of the tablespace's datafiles.
  • Tables and index-organized tables
  • Constraints
  • Views
  • Database links
  • Database triggers
  • Dimensions
  • External procedure librarie
  • Indexes and indextypes
  • Java classes, Java resources, and Java sources
  • Materialized views and materialized view logs
  • Object tables, object types, and object views
  • Operators
  • Sequences
  • Stored functions, procedures, and packages
  • Synonym
  • Tables and index-organized tables
  • Clusters 

Types of NON-SCHEMA Objects

There are several other types of objects which are also stored in the database but are not contained in a schema are:
  • Contexts
  • Directories
  • Parameter files (PFILEs) and server parameter files (SPFILEs)
  • Profile
  • Roles
  • Rollback segments
  • Tablespaces
  • User
 For some objects, such as tables, indexes, and clusters, you can specify how much disk space Oracle Database allocates for the object within the tablespace's datafiles.

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