Define instances and schemas

3. Define instances and schemas.
 
Define instances and schemas 1



Define instances and schemas

In DBMS, Instance is the information stored in the Database at a particular moment. Schema is the overall Design of the Database. In programming, we declare a variable which corresponds to “Schema”. But its values changes as and when required which corresponds to “Instance”.
 

 

Physical Schema describes database design at physical level while a logical schema describes the database design at the logical level. A database may also have several schemas at the view level, sometimes called subschemas, that describe different views of the database.

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