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title aliases tags
13-databases-1
cosc203
lecture

What is a database

  • an integrated collection of data
  • implicit properties
    • represents some aspect of th real world, called miniworld
    • is a coherent collection of data with inherent meaning
    • is designed built and populated with data for a specific purpose

DBMS

  • a software system designed to store, manage, and facilitate access to the database
  • Oracle, SQL erver, MySQL, MonogDB

Application program

  • a program that provides access to the dtabase by sending queries and requests for data to the DBMS

data base system diagram|400

This course

  • modelling and design of DBs
  • programming (SQL + appliation development)
  • DBMS implementation

specifiically relational databases

  • ER modelling
  • datbase normalisation
  • SQL

Data modelling

first step in designing database

  • create a data model for a specific problem domain

a model is Defn: a collection of concepts that can be used to describe the structure of a database such as data types, relationsips, and contraints that should hold for the data

schema Defn: a collection of metadata that describes the logical view of a database

noSQL databases are either schema-free or have relaxed schemas