1.What's data warehouse?
Data warehouse (DW) is a database used for reporting and analysis. DW maintains its functions in three layers: staging, integration, and access. Staging is used to store raw data for use by developers. The integration layer is used to integreate data and to have a level of abstraction from users. The access layer is for getting data out for users. It's now widely used in all kinds of careers.
2.The features of DW
One of the most…
Added by 陶嘉羚 on December 31, 2011 at 9:30pm — No Comments
The course database is the most special one I have taken so far in THU.It's the first course I've taken that indeed gives students a chance to be lecturers on the stage. And we all proved that we deserve the trust. Now the course ends, what I can proudly show to others includes an instructive vedio teaching SQL,a plugin of wordpress called iCalorie with an advertisement selling it. Moreover, our team wrote a booklet of our product in terms of compatability, fault tolerance, query…Continue
Added by 陶嘉羚 on December 30, 2011 at 4:00pm — No Comments
1.The error-tolerance design & the fault-tolerance design
An error-tolerance design is one that unduly penalizes user errors. Also, there is another concept called fault-tolerant design, which aims at allowing equipment to continue functioning in the presence of hardware faults.
We did implemented the error-tolerant design. For instance, if the user inputs wrong password when he logs in, a message box will pop up to remind him of the mistake,…Continue
Added by 陶嘉羚 on December 15, 2011 at 10:30am — No Comments
Added by 陶嘉羚 on December 5, 2011 at 7:30pm — No Comments
Up to now, we have acquired much knowledge related to database system. We have had a basic understanding of SQL, relational model, E-R model, system design, XML, system design and application, transactions and so on. But, with all of them grasped, can we have a better understanding of ourselves? Is database related to our daily learning activities? Can we interpret human brain with the viewpoint of database? These questions are quite interesting and attractive. Now, I will explore…Continue
Added by 陶嘉羚 on December 1, 2011 at 8:00pm — No Comments
When developing our plugin for Wordpress, an idea occurred to me that why not develop an
apk for my android cellphone? I read a lot about development with Android SDK, and so far,
I‘ve prepared the environment for development and tried some sample apks. It is so thrilling
that it kept me awake and playing with it the whole night.
Added by 陶嘉羚 on November 21, 2011 at 1:00pm — No Comments
Added by 陶嘉羚 on November 7, 2011 at 1:00am — No Comments
I want to talk about my experience and gain last week first. Last Saturday,
Added by 陶嘉羚 on October 30, 2011 at 1:30pm — No Comments
Added by 陶嘉羚 on October 16, 2011 at 5:09pm — No Comments
Mathematica is a software with fascinating user interface and powerful data manipulation. It can deal with numbers, strings and graphs. I did the data visualization part of our lecture this week, and here are some tips for quick learning Mathematica that might be helpful.
1. Installing Mathematica 7.0 is easier, because it’s kind of hard to find registration code generator online for the latest version Mathematica 8.0, at least for me.
Added by 陶嘉羚 on September 30, 2011 at 4:24am — No Comments