Database and Database users - Characteristics of the DB approach - Self Describibg nature of a Database System

4 important questions on Database and Database users - Characteristics of the DB approach - Self Describibg nature of a Database System

Explain working of a DBMS>

For example in a university database wheneever a request is made to access, say Name of the student record, the DBMS software refers to the catalog to determine the structure of student and position and size of Name data item within the student record.

Differences in File processing software and DB software?

File processing software can access only specific Databases while DB software can access database definitions from the catalog and use catalog and then using these definitions.

Mention a fundamental characteristic of DB>

A DB system not only contains DB itself but also a complete definition and description of database structure and constraints.
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What is contained in a catalog and what is meta-data?

Catalog contains structure of each file, the type of each file,storage format of each data item and various constraints on the data. Info stored in a Catalog is called META-DATA.

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