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59 Cards in this Set
- Front
- Back
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What is validation?
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process of comparing data with a set of rules to find out if data is correct.
reduce data entry errors and enhance data integrity before program writes data on disk |
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What is a file processing system?
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each department or area within organization has its own set of files
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What is the database approach?
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many programs and users can share data in database...secures data so only authorized users can access certain data.
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How do a database application and a file processing application differ in the way they store data?
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two separate files-every dpt. has their copies..can get what they need with member id
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What is a data dictionary?
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contains data about each file in database and each field within those files
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What is a query?
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request for a specific data from a database.
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What is query language?
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consists of simple, english-like statements that allow users to specify data to display, print, or store
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What is a query by example?
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program retrieves records that match criteria entered in form fields. has a graphical user interface that assists users with retrieving data
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What is a form?
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window on screen tha provides areas for entering or changing dta in database, used to retrieve and maintain data in a database, form that sends data across newwork or internet is called e-form, short for electronic form
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What is a report generator?
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allows user to design a report on screen, retrieve data into report design, then display or print reports, also called report writer
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What is data security?
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access priveleges define activities that specific user or group of users can perform. To ensure only authorized users can access data.
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What are backup?
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backup is a coy of the entire database
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What is log?
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log is a listing of activities that change database contents.
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what is a recovery utility?
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uses logs and/or backups to restore database when it is damaged or destroyed.
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What is a data model?
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rules and standards that define how database organizes data, defines how users view organization of data
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What are four popular data models?
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relational, object-oriented, object-relational, multidimensional
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What is a relational database?
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stores data
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What is a relationship?
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connection within data
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What is strctured Query Language (SQL)?
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allows you to manage, update and retrieve data, has special keywords and rules included in SQL statements.
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What is an object-oriented database?
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stores data in objects
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What is a multidimensional database?
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stores data in dimensions, allows users to analyze any view of data
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What is a data warehouse?
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huge database system that stores and manages data required to analyze historical and current transactions
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What is a web database?
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database you can access through the web by filling a form on a web page. Usually resides on a database server, a computer that stores and provides access to a database
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What are computer communications?
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process in which two or more computers or devices transfer data, instructions, and information
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What is a sending device
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— initiates instruction to transmit data, instructions, or information
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What is a communications device?
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connects the sending device to the communications channel, connects the communications channel to the receiving device
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What is a communications channel?
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media on which data, instructions, or information travel
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What is a receiving device?
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accepts transmission of data, instructions, or information
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What are wireless access points and cyber cafes?
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wireless internet access poiints allows wireless connection to internet in public location.
cyber cafe-coffee house that provides computers with internet access |
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What is global positioning system?
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GPS satellites orbit Earth. Every thousandth of a second, each satellite sends a signal that indicates its current position to the GPS receiver.
STEP 2: GPS receiver determines its location on Earth by analyzing at least 3 separate satellite signals from the 24 satellites in orbit. |
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What are collaboration?
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is working with other users connected to a server
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What is groupware?
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is software that allows ppl. to share information
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What is voice mail?
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is voice message converted to digital form
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What are web services?
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describe standardized software that enables programmers to create applications that communicate with other remote computers over the Internet or on an internal business network
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What is a network?
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Collection of computers and devices connected via communications devices and transmission media
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What is a local area network? (LAN)
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Network in limited geographical area such as home or office building
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What is wireless lan?
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Metropolitan area network (MAN) connects LANs in city or town
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What is wide area network?
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network that covers large geographic area using many types of media. Internet is world's largest WAN
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What is a client/server network?
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one or more computers act as a server and other computers, or clients access server.
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What is a bus network?
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all computers and devices connect to central, cable or bus.
ex. of network topology (layout of devices in network) |
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What is a ring network?
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cables forms closed ring with all computers and devices arranged along ring. data travels from device to device around entire ring
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What is a star network?
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all devices connect to a central device, called hub
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What is intranet?
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Metropolitan area network (MAN) connects LANs in city or town
makes info accessible to employees, connection to internet typically |
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What are ethernet?
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technology allows computers to contend for access to network
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What is token ring?
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technology controls access to network by requiring devices to pass a special signal, called token
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What are TCP/IP and 802.11 (Wi-Fi)?
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technology transmits data by breaking it up into small pieces or packets
802.11 (Wi-Fi) family and standards for wireless LANS |
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What is bluetooth?
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short range radio waves transmit data between bluetooth devices
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What is the public-switched telephone network? (PTSN)
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world wide telephone system that handles voice-oriented telephone calls
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What is IrDA?
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specification allows data to be transferred wirelessly via infrared light waves
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What is worldwide interoperability for microwave access (wiMAS or 802.16)
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standard that specifies how wireless devices communicate over the air in a wide area
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What is radio frequency identification (RFID)?
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uses radio signals to communicate with a tag placed in an object
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What is wireless applications protocols (WAP)?
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\allow wireless mobile devices to access Internet
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What is a dial-up line?
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Temporary connection using telephone line for communications
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What is a dedicated line?
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always on connection btwn. two communication devices;
ISDN, DSL |
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What is a dial-up modem?
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Converts digital signals to analog signals and vice versa
Notebook computers often use PC Card modem |
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What are ISDN and DSL modems?
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Communications devices that send and receive digital ISDN and DSL signals
Usually external devices in which one end connects to a telephone line and the other end connects to a port on the system unit |
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What is web services?
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standardized software that enables programmers to create applications that communicate with other remote computers over the internet
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What is collaboration?
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working with other users connected to a server
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What is groupware?
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software that allows ppl. to share information
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