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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