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What is DBMS and what are functions of DBMS?
DBMS consist of collection of integrated data and set of program to admission those data.
The functions performed by a typical DBMS are the subsequent:
• Data Definition: The DBMS gives functions to define the structure of the data in the application. These involved defining and modifying the record structure, the kind and size of fields and the several constraints/conditions to be satisfied through the data in each field.
• Data Manipulation: Once the data structure is described, data required to be inserted, modified or deleted. The functions that perform these operations are also element of the DBMS. These functions can handle planned and unplanned data manipulation required. Planned queries are those that form part of the application. Unplanned queries are ad-hoc queries that are performed on a required basis.
• Data Security & Integrity: The DBMS contains functions that handle the security and integrity of data in the application. These can be therefore the DBMS provides an environment which is both convenient and efficient to use while there is a large volume of data and several transactions to be proved
Define data model? A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.
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