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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.