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Pt 1-Database Cpts

Database Fundamentals

QuestionAnswer
changes to a list causing confusion & uncertainty to said list modification problems
attribute value that has never been supplied; such values ambiguous & can mean value is unknown, not appropriate, or known to be blank null values
data are stores in relations & relationships between rows represented by data values relational data model
consists of relations; in practice: contains relations w/duplicate rows relational database
holds data about one & only one theme, in most circumstances table
insert, update, & deleted are considered the modification actions
international language for defining structure & processing of relational database Structured Query Language (SQL)
self-describing collection of related records, or for relational databases, of related tables database
set of programs used to define, administer, & process a database & its applications database management system (DBMS)
set of one or more computer programs that serves as intermediary between user & DBMS database application
4th component of a data base system; employ database application to keep track of things users
description of structure of database is contained within database itself; allows for contents of database to be determined by looking inside database itself self-describing
common data shared between two or more tables related tables
data concerning structure of data in database stored in data dictionary metadata
relationship constraint on foreign key values referential integrity constraints
condition which 2 or more transactions are processed against database at same time concurrency
database technology used to track things used by only one user; including only a few tables, & each table would have at most a few hundred rows personal database system
enormous databases supporting thousands of concurrent users; containing hundreds of tables w/millions of rows of data enterprise-class database systems
study of database technology is important because databases are used increasingly in __ __ everywhere information systems
purpose of textbook is to teach essential database concepts, technology, & techniques needed to become a __ __ database developer
helps people keep track of things purpose of a database
exists when storing of 1 row in table records facts about 2 themes, deletion of a row removes facts about 2 themes, or data change must be made in multiple rows for consistency types of modification problems
assigns unique identifier to specific rows because said rows may have duplicate information ID column
process tables in relational databases; join together & display data stored in separate tables, create new tables, & query data from tables in many ways; use to insert, update, & delete data purpose of SQL
when two tables share data or themes relationships in relational databases
database, DBMS, one or more database applications, & user four components of databases
creates & processes forms application metadata
Created by: lfrancois
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