Database system architecture
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Database System Architecture. The Functional Components of a database system can be divided into 3 units. Storage Manager Query Processor Database users and administrators. Storage Manager. It is a program module that provides an interface between the database and application program .

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The functional components of a database system can be divided into 3 units
The Functional Components of a database system can be divided into 3 units

  • Storage Manager

  • Query Processor

  • Database users and administrators.


Storage manager
Storage Manager

  • It is a program module that provides an interface between the database and application program.

  • The storage manager is responsible for storing, retrieving and updating the data in the database.


Storage manager components
Storage Manager Components

  • Authorization and Integrity manager

    • Which tests for the satisfaction of integrity constraints and checks the authority of users to access data.

  • Transaction Manager

    • Which ensures that the database remains in a consistent state when the system failures and that concurrent transaction executions proceed without conflicting.


Storage manager components1
Storage Manager Components

  • File Manager

    • Which manages the allocation of storage space on disk and data structures used to store those information's

  • Buffer Manager

    • Which is responsible for fetching data from disk into main memory.


Data structure used by the storage manager
Data Structure used by the storage Manager

  • Data Files

    • Stores database

  • Data dictionary

    • Structure of the database

  • Indices

    • Which can provide fast access to data items. Hashing technique is used for accessing


Query processor
Query Processor

  • DDL Interpreter

    • Which interprets DDL statements (Convert DDL statement into Low level data)

  • DML Compiler

    • Translates MDML statements

  • Query Evaluation Engine

    • Which execute low level instructions generated by the DML compiler.


Database users
Database Users

  • Application programmers

    • Program written in a host language

  • Sophisticated users

    • Interact with the database using query language (analysis)

  • Specialized user

    • Specialized users who write specialized database applications that do the into the traditional data processing frame work (example CAD system, Knowledge based expert system)

  • Naïve users

    • Interact with the system by invoking one of the permanent application (tellers agents, web users)


Database administrator
Database Administrator

  • A Person who has such central control over the system is called a database administrator (DBA).

    The functions are

    • Schema definition

      • Set of data definition statements in the DDL.

    • Storage structure and access method definition

    • Schema and physical organization modification.

      • Alter the physical organization to improve performance

    • Granting of authorization for data access (give authorization)

    • Routine maintenance

      • Periodically backup database

      • Ensuring that enough free disk space

      • Monitoring jobs



Advantages of dbms
Advantages of DBMS

  • Control of data redundancy

  • Data Consistency

  • Sharing of data

  • Improved security

  • Enforcement of standards

  • Economy of scale

  • Balance of conflicting requirements

  • Improved data accessibility and responsiveness.

  • Increased productivity

  • Increased maintenance through data independence.

  • Increased concurrency.

  • Improved backup and recovery services.


Disadvantages of dbms
Disadvantages of DBMS

  • Complexity

  • Size

  • Cost of DBMS

  • Additional hardware cost

  • Cost of conversion

  • Performance

  • Higher impact of failure.