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35 Cards in this Set
- Front
- Back
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What is a database
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A database is an organized collection of logically related data.
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What is data and the 2 types
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Data are facts, text, images, sound, and video segments that have meaning in the users’ environment.
Structured: Unstructured: |
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What do database skills allow IT professionals to do
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Database skills enable IT professionals to know which data are logically related and how to best organize them.
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What is metadata
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Data about data or Descriptions of the properties or characteristics of the data, including data types, field sizes, allowable values, and data context
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What are the cons of traditional file processing?
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program-data dependence
duplication of data limited data sharing lengthy development time excessive program maintenance a lot of experienced programmers and developers |
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What are the pros of database technology
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program-data independence
minimal data redundancy improved data consistency, quality, accessibility, and sharing increased productivity and less maintenance ` |
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What are the 3 things about the database approach
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Central repository of shared data
Data is managed by a controlling agent Stored in a standardized, convenient form It also Requires a Database Management System (DBMS) |
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What are the functions of a DBMS
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Create databases
Create tables Create supporting structures Read database data Modify database data (insert, update, delete) Maintain database structures Enforce rules Control concurrency Provide security Perform backup and recovery |
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Define data models
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Graphical system capturing nature and relationship of data
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Define Enterprise Data Model
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high-level entities and relationships for the organization
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Define Project Data Model
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more detailed view, matching data structure in database or data warehouse
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What are relational databases
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Database technology involving tables (relations) representing entities and primary/foreign keys representing relationships
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How do databases use Internet technology
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Networks and telecommunications, distributed databases, client-server, and 3-tier architectures
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What are database applications
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Application programs used to perform database activities (create, read, update, and delete) for database users
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What are the Cost and risks associated with database technology
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new, specialized personnel
installation and management costs and complexity conversion costs need for explicit backup and recovery organizational conflict |
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What is the first step in the database approach
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Creating an enterprise data model
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What goes into an enterprise data model
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First step in database development
Specifies scope and general content Overall picture of organizational data at high level of abstraction Entity-relationship diagram Descriptions of entity types Relationships between entities Business rules |
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What is an entity
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An entity is a person, place, object, event or concept about which an organization wishes to maintain data.
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What is an association
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An association is a relationship between entities whose naming and notation capture fundamental business rules
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What is functional decomposition
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Iterative process breaking system description into finer and finer detail
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What are Planning matrixes
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Describe interrelationships between planning objects in the organization
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What are the types of matrixes
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Location-to-function
Unit-to-function IS-to-data entity Supporting function-to-data entity IS-to-business objective |
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What is top down planning
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A methodology that attempts to gain a broad understanding of the information system needs of the entire organization
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What is bottom up planning
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A methodology that identifies and defines IS development projects based upon solving operational business problems or taking advantage of business opportunities
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What are the 7 processes in the SDLC
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Identify Project
Initiate and plan Analyze Logical design Physical design Implementation Maintenance |
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What are the database development activities as they relate to the SDLC
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Identify Project (Enterprise
Modeling) Initiate and plan(Conceptual Data Modeling) Analyze (Conceptual Data Modeling) Logical design (Logical DB Design) Physical design (Physical DB Design/Creation) Implementation (DB Implementation) Maintenance (DB Maintenance) |
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What are the components of the DB enviorment?
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CASE Tools
Repository DBMS Database Application programs User interface Data and database administrators System developers End Users |
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What are the different types of databases
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Personal
Workgroup Department/Division Enterprise Web-enables |
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What are the six key components of an information systems architecture
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Data
Processes Networks People Events and points in time Reasons |
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What are business functions
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A related group of business processes that support some aspects of the mission of the enterprise.
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What are 3 reasons to use a function to data entity matrix
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identify orphans
spot missing entities prioritize development |
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What are the 2 benefits to using packaged data models
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Dramatically reduced implementation times and costs
Higher quality models |
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Who are the members of the DB development team
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Business Analysts
Systems analysts DB analysts and data models Users Programmers Database architects Database administrators Project managers Other technical experts |
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What are the three schema components
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External Schema
Conceptual Schema Internal Schema pg 55 |
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What are the three tiers commonly used in DB location architecture
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Client tier
Application/Web server tier Enterprise Server tier pg 60 |
