ACTIVITY  TASK MODULE 1 INFMNGT (LECTURE)


DBMS Functions

  • Data Definition - the DBMS must be able to Accept Data definitions (external, internal and conceptual schemas, and all associated mappings) in source form and convert to the appropriate object form


  • Data Manipulation - The DBMS must be able to handle request from the user to retrieve and possibly update existing data in the database, or to add a new data to the database.


  • Data Security and Integrity - the DBMS must be able to monitor user requests and reject any attempts to violate the security and integrity checks defined by the database administrator


  • Data Recovery and Concurrency - the DBMS must have the capability of recover from, or minimize the effects of a system crash


  • Data Dictionary - The DBMS must provide  a system database dictionary.
ADVANTAGES OF DATABASE

REDUCED DATA REDUNDANCY
DATA INTEGRITY 
DATA INDEPENDENCE 
DATA SECURITY 
DATA CONSISTENCY 
EASIER USE OF DATA 
LESS STORAGE

DISADVANTAGES OF DBMS

COMPLEXITY 
EXPENSE 
VULNERABILITY 
SIZE 
TRAINING COSTS 
COMPATIBILITY 
LOCKING-IN OF TECHNOLOGY

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