Schema is basically a Associated with each database user . It is a collection of schema objects. Examples of schema objects include tables, views, sequences, synonyms, indexes, clusters, database links, snapshots, procedures, functions, and packages. Schema objects are logical data storage structures. Schema objects don\'t have a one-to-one correspondence to physical files on disk that store their information. Even Oracle 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.