Legacy Systems August 27, 2006
Posted by nhabibi in Computer-Science Term.add a comment
As I was reading a book about database programing, I faced the term “Legacy Database”.
I saw a good difinition for legacy systems (in general), in wikipedia. Here go some selected parts:
A legacy system is an existing computer system or application program which continues to be used because the user does not want to replace or redesign it.
Legacy systems are considered to be potentially problematic by many software engineers for several reasons. Legacy systems often run on obsolete (and usually slow) hardware, and sometimes spare parts for such computers become increasingly difficult to obtain. These systems are often hard to maintain, improve, and expand because there is a general lack of understanding of the system. The designers of the system may have left the organization, leaving no one left to explain how it works. Such a lack of understanding can be exacerbated by inadequate documentation or manuals getting lost over the years. Integration with newer systems may also be difficult because new software may use completely different technologies.
Despite these problems, organizations can have compelling reasons for keeping a legacy system, such as:
- The costs of redesigning the system are prohibitive because it is large, monolithic, and/or complex.
- The system requires close to 100% availability, so it cannot be taken out of service, and the cost of designing a new system with a similar availability level is high.
- The system works satisfactorily, and the owner sees no reason for changing it.
Bookmark Online August 25, 2006
Posted by nhabibi in Internet.add a comment
del.icio.us is an online bookmarkig system where you can save your favorite URLs , share them with others and search through all saved ones. Also you can see an URL popularity by means of number of people who saved it.
Each URL is saved with a tag:
Tags are one-word descriptors that you can assign to any bookmark. You can assign as many tags to a bookmark as you like, and rename, delete, add or merge tags together.Tagging can be a whole lot easier and more flexible than fitting your information into preconceived categories.
Very useful and funny. Try it!
Ubuntu Linux August 24, 2006
Posted by nhabibi in Linux.add a comment
Ubuntu is a linux distribution with very freindly interface,fast and nice. People selected it as the best linux in 2005. The best thing (!!! 
) about it is that you can order it online for free from here.
I used its live mode for several weeks. This distribution was the only one that didn’t have any problems with my sound card and modem!!!
For more info and guides visit this persian site .
PS: Its name really becomes it: “humanity to others”
Intro August 24, 2006
Posted by nhabibi in nhabibi.1 comment so far
I just started blogging. It’s a new experience and Hope that I can make a good blogger! Welcome to comments and ideas.
I appreciate friend who guided me toward writing online.
