Flashcards in Information Technology 4 Deck (17):
What does a processing control check?
Checks if data processing produced proper output
What is a hash total?
An input control number- a meaningless sum of values included in the input.
Example would be summing a list of SSNs to make sure the data is the same once entered as it was prior to input into the system.
What is a validity check?
Checks to see if data in existing tables or files belongs in the set
For example- is there a # in an alpha-only field or a letter in a numeric-only field
What is a limit check?
Checks to see if numbers surpass a certain limit- i.e. in an age field is the number greater than 110.
What is a check digit?
An input control that adds an identification number to a set of
digits - usually at the end
What is a field check?
An input check that prevents invalid characters- i.e. checks for alphabetic letters in a SSN field
What is a Hot Site?
A disaster recovery system where if the main system goes down- a Hot Site is ready to take over immediately.
What is a Cold Site?
If a main system goes down- a Cold Site will take time to get set up and running.
What is the most common database language?
SQL - Standard Query Language
What is a Data Definition Language?
Defines SQL Database
Controls SQL Tables
What is a Data Manipulation Language?
Queries SQL Database tables
What is a Data Control Language?
Controls Access to SQL Database
What are the characteristics of a Relational Database?
Uses rows and columns similar to spreadsheet
What are the characteristics of a Hierarchical Database?
Has various levels
Uses trees to store data
What are the advantages of a database?
Data is more accessible
What are the disadvantages of a database?
Cost of installation
Skilled personnel required to maintain