Sunday, 4 May 2014

Top 10 Largest Databases in the World

Largest Databases in the World

A database is an organized collection of data. The data are typically organized to model relevant aspects of reality in a way that supports processes requiring this information. For example, modelling the availability of rooms in hotels in a way that supports finding a hotel with vacancies.
Database management systems (DBMSs) are specially designed software applications that interact with the user, other applications, and the database itself to capture and analyze data. A general-purpose DBMS is a software system designed to allow the definition, creation, querying, update,
and administration of databases. Well-known DBMSs include MySQL, MariaDB, PostgreSQL, SQLite, Microsoft SQL Server, Oracle, SAP HANA, dBASE, FoxPro, IBM DB2, LibreOffice Base, FileMaker Pro and InterSystems Caché. A database is not generally portable across different DBMSs, but different DBMSs can interoperate by using standards such as SQL and ODBC or JDBC to allow a single application to work with more than one database.                                                                                                                                                     

1. The World Data Centre for Climate:

" The ICSU World Data System (WDS) was created by the 29th General Assembly of the International Council for Science (ICSU) and builds on the 50-year legacy of the former ICSU World Data Centres (WDCs) and former Federation of Astronomical and Geophysical data-analysis Services (FAGS).
WDS strives to form a worldwide ‘community of excellence’ for multidisciplinary scientific data, which ensures the long-term stewardship and provision of quality-assessed data and data services to the international science community and other stakeholders. Its concept aims at a transition from existing stand-alone components and services to a common globally interoperable distributed data system, with searchable common data directories and catalogues that incorporates emerging technologies and new scientific data activities. Disciplinary and multidisciplinary data networks within WDS will play a key role in moving this concept forward."

2. National Energy Research Scientific computing Center:

NERSC is known as one of the best-run scientific computing facilities in the world. It provides some of the largest computing and storage systems available anywhere, but what distinguishes the center is its success in creating an environment that makes these resources effective for scientific research. NERSC systems are reliable and secure, and provide a state-of-the-art scientific development environment with the tools needed by the diverse community of NERSC users. NERSC offers scientists intellectual services that empower them to be more effective researchers. For example, many of our consultants are themselves domain scientists in areas such as material sciences, physics, chemistry and astronomy, well-equipped to help researchers apply computational resources to specialized science problems.

3. AT&T:

One of the oldest telecommunication companies, the American based AT&T has one of the largest databases. The company boasts that they have the largest volume of data in one unique database. Also AT&T has one of the largest database with most number of rows (around 1.9 Trillion), second to Sprint. It’s said that AT&T has been recording the details of callers long before terabytes storing came into market.

4. Google:

The giants in internet searching- Google bags the number 4th spot in top 10 largest databases. Although the exact size of Google’s database is unknown, it’s said that Google accounts every single search that makes each day into its database which is around 91 million searches per day. Google stores every search and makes patterns from previous searches so that the user can be easily directed. Google also collects information of their users and stores them as entries in their database which is said to expand over 33 trillion entries. On top of that Google has simply expanded their database with Gmail and Google ads and with their acquisitions like YouTube.

5. Sprint:

One of the largest telecommunication providers, Sprint bags the number 5th spot with its immense and ever growing database. One of the largest mobile service providers with around 53 million subscribers, Sprint offers local and long distance land line offerings. It’s said that Sprint’s database records more than 365 million call detail per day. Sprint is also proud owner of the database with most number of insertions. According to reports the database spreads over 2.85 trillion rows. During peak hours, it’s said that this database records around 70,000 calls per second.

6. LexisNexis:

LexisNexis® is a leading global provider of content-enabled workflow solutions designed specifically for professionals in the legal, risk management, corporate, government, law enforcement, accounting, and academic markets. LexisNexis originally pioneered online information with its Lexis® and Nexis® services. Part of Reed Elsevier, LexisNexis Legal & Professional serves customers in more than 100 countries with 10,000 employees worldwide.
To help customers win in their own marketplace, LexisNexis delivers Total Solutions—innovative products and services to address specific customer needs in order to improve productivity, increase profitability and stimulate growth.

7. Youtube:

The owners of the largest online video library- YouTube is our number 7 candidate in our top 10 databases across the world. Reports say that about a 100 million videos are watched in YouTube which is about 60% of the overall number of videos watched online. Still the Wall Street Journal in 2006 reported that YouTube’s database features around 45 Terabytes of data. 45 terabytes won’t sound like a large number but when you consider that around 65,000 new videos are being posted daily in YouTube, just think of the database that they now are having.

8. Amazon:

With a massive 59 million active customers and more than 42 terabytes of data, it’s Amazon that races itself to the number 8thspot in our top 10 databases. World’s largest retail store, Amazon has huge collection of data that includes general information like phone number and address to receipts and wishlists and any sort of data that the website can extract from its users as they are logged on. It’s said that Amazon has a mass collection of 250,000 full text books which are available online. No wonder Amazon is considered as the world’s largest online community as users can interact and comment virtually on every page of this website.

9. Central Intelligence Agency (CIA):

The Central Intelligence Agency (CIA) is one of the principal intelligence-gathering agencies of the United States federal government. The CIA's headquarters is in Langley, Virginia, a few miles west of Washington, D.C. Its employees operate from U.S. embassies and many other locations around the world. The only independent U.S. intelligence agency, it reports to the Director of National Intelligence.
The CIA has three traditional principal activities, which are gathering information about foreign governments, corporations, and individuals; analyzing that information, along with intelligence gathered by other U.S. intelligence agencies, in order to provide national security intelligence assessment to senior United States policymakers; and, upon the request of the President of the United States, carrying out or overseeing covert activities and some tactical operations by its own employees, by members of the U.S. military, or by other partners. It can, for example, exert foreign political influence through its tactical divisions, such as the Special Activities Division.

10. Library of Congress:

The Library of Congress is the nation's oldest federal cultural institution and serves as the research arm of Congress. It is also the largest library in the world, with millions of books, recordings, photographs, maps and manuscripts in its collections.
The Library's mission is to support the Congress in fulfilling its constitutional duties and to further the progress of knowledge and creativity for the benefit of the American people.