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An object retains its identity even if some or all the values of variables or definitions of methods change over time. This concept of identity does not apply to tuples of a relational database. In relational systems, the tuples of a relation are distinguished only by the values that they contain. It is a conceptual notion; actual system requires a physical mechanism to identify objects uniquely.

The types of object identity are given below-

a. Value: A data value is used for identity. This form of identity is used in relational systems. For instance, the primary key value of tuple identifies the tuple.

b. Name: A user-supplied name is used for identity. This form of identity typically is used for files in file systems. Each file is given a name that uniquely identifies the file, regardless of the contents of the file.

Built-in: A notion of identity is built into the data model or programming language and no user-supplied identifier is required. This form of identity is used in object-oriented systems. Each object is automatically given an identifier by the systems. Each object is automatically given an identifier by the system when that object is created.

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