Bilgi - Dünyanın en büyük 10 bilgisayar veri tabanı

Dünyanın en büyük 10 bilgisayar veri tabanı listesi; 10 dan 1’e doğru

10. Library of Congress

Not even the digital age can prevent the world's largest library from ending up on this list. The Library of Congress (LC) boasts more than 130 million items ranging from cook books to colonial newspapers to U.S. government proceedings. It is estimated that the text portion of the Library of Congress would comprise 20 terabytes of data. The LC expands at a rate of 10,000 items per day and takes up close to 530 miles of shelf space -- talk about a lengthy search for a book.

• 130 million items (books, photographs, maps, etc)
• 29 million books
• 10,000 new items added each day
• 530 miles of shelves
• 5 million digital documents
• 20 terabytes of text data

9. Central Intelligence Agency

The Central Intelligence Agency (CIA) is in the business of collecting and distributing information on people, places and things, so it should come as no surprise that they end up on this list. Although little is known about the overall size of the CIA's database, it is certain that the agency has amassed a great deal of information on both the public and private sectors via field work and digital intrusions.

• 100 FOIA items added each month
• Comprehensive statistics on more than 250 countries and entities
• Unknown number of classified information

8. Amazon

Amazon, the world's biggest retail store, maintains extensive records on its 59 million active customers including general personal information (phone number address, etc), receipts, wishlists, and virtually any sort of data the website can extract from its users while they are logged on. Amazon also keeps more than 250,000 full text books available online and allows users to comment and interact on virtually every page of the website, making Amazon one of the world's largest online communities.

• 59 million active customers
• More than 42 terabytes of data

7. YouTube

After less than two years of operation YouTube has amassed the largest video library (and subsequently one of the largest databases) in the world. YouTube currently boasts a user base that watches more than 100 million clips per day accounting for more than 60% of all videos watched online.

• 100 million videos watched per day
• 65,000 videos added each day
• 60% of all videos watched online
• At least 45 terabytes of videos

6. ChoicePoint

Imagine having to search through a phone book containing a billion pages for a phone number. When the employees at ChoicePoint want to know something about you, they have to do just that. If printed out, the ChoicePoint database would extend to the moon and back 77 times.

ChoicePoint is in the business of acquiring information about the American population -- addresses and phone numbers, driving records, criminal histories, etc., ChoicePoint has it all. For the most part, the data found in ChoicePoint's database is sold to the highest bidders, including the American government.

• 250 terabytes of personal data
• Information on 250 million people

5. Sprint

Sprint is one of the world's largest telecommunication companies as it offers mobile services to more than 53 million subscribers, and prior to being sold in May of 2006, offered local and long distance land line packages.

• 2.85 trillion database rows.
• 365 million call detail records processed per day
• At peak, 70,000 call detail record insertions per second

4. Google

Although there is not much known about the true size of Google's database (Google keeps their information locked away in a vault that would put Fort Knox to shame), there is much known about the amount of and types of information Google collects.

In terms of internet databases, Google is king.

• 91 million searches per day
• accounts for 50% of all internet searches
• Virtual profiles of countless number of users

3. AT&T

Similar to Sprint, the United States' oldest telecommunications company AT&T maintains one of the world's largest databases. Architecturally speaking, the largest AT&T database is the cream of the crop as it boasts titles including the largest volume of data in one unique database (312 terabytes) and the second largest number of rows in a unique database (1.9 trillion), which comprises AT&T's extensive calling records.

• 323 terabytes of information
• 1.9 trillion phone call records

2. National Energy Research Scientific Computing Center

The second largest database in the world belongs to the National Energy Research Scientific Computing Center (NERSC) in Oakland, California. NERSC is owned and operated by the Lawrence Berkeley National Laboratory and the U.S. Department of Energy.

• 2.8 petabytes of data
• Operated by 2,000 computational scientists

1. World Data Centre for Climate

Operated by the Max Planck Institute for Meteorology and German Climate Computing Centre, The World Data Centre for Climate (WDCC) is the largest database in the world.

• 220 terabytes of web data
• 6 petabytes of additional data