Chapter 11

Question 1

Components of a TP Application?

Answer 1

Front-end program; request controller; transaction server; dbms

Question 2

What are the functions of the FRONT-END PROGRAM?

Answer 2

TO gather input and display output (user interaction) and to construct requests and interpret replies

Question 3

Core technologies for client side:

Answer 3

JAVA APPLETS, JAVASCRIPT

Question 4

core technologies for server-side:

Answer 4

CGI programs, web server API, java servlets, SSI, jsp

Question 5

applet advantages

Answer 5

• enhance UI-Support
• Applet may connect directly to Db-server, connection-server and application server
• applet state can preserve db-connections across interactions allowing long, multi-step transactions and distributed transactions

Question 6

Applet disadvantages:

Answer 6

• higher initial loading time due to downloading the applet from web-server
• java security (unsigned applet can only connect back to server of origin)
• No adequate support for combined client/server-side transactions
• requires enabling/allowing connection to db-server systems from web clients

Question 7

ajax characteristics

Answer 7

Ajax avoids reloading complete pages, only interacts with server for subset of the content or avoids interations altogether. The user perceives web application as faster, due to asynchronous loading of data. State preserved inside javascript variables across multiple interactions

Question 8

statefull interactions may depend on the outcome of previous steps. HTTP is a stateless protocol
session support is required. Name alternatives

Answer 8

Common techniques: HTTP-cookies, http-authentication, URL encoding, Form variables (hidden form fields),