By properly specifying a tablespace during the creation of each table, you can increase the performance of the database system and decrease the time needed for database administration.
A row is a collection of column information corresponding to a single record. If users attempt to circumvent the database access control mechanisms by looking inside Oracle data files directly with operating system tools, encryption prevents these users from viewing sensitive data. A is like any other table column, except that its value is derived by evaluating an expression.
A cluster is a group of tables that share the same data blocks because they share common columns and are often used together.
Clusters and clustered tables are discussed in Managing Clusters.
Usually, the application developer is responsible for designing the elements of an application, including the tables.
Database administrators are responsible for establishing the attributes of the underlying tablespace that will hold the application tables.