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LA GRAMMATICA DI ENGLISH GRATIS IN VERSIONE MOBILE   INFORMATIVA PRIVACY

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WIKIBOOKS
DISPONIBILI
?????????

ART
- Great Painters
BUSINESS&LAW
- Accounting
- Fundamentals of Law
- Marketing
- Shorthand
CARS
- Concept Cars
GAMES&SPORT
- Videogames
- The World of Sports

COMPUTER TECHNOLOGY
- Blogs
- Free Software
- Google
- My Computer

- PHP Language and Applications
- Wikipedia
- Windows Vista

EDUCATION
- Education
LITERATURE
- Masterpieces of English Literature
LINGUISTICS
- American English

- English Dictionaries
- The English Language

MEDICINE
- Medical Emergencies
- The Theory of Memory
MUSIC&DANCE
- The Beatles
- Dances
- Microphones
- Musical Notation
- Music Instruments
SCIENCE
- Batteries
- Nanotechnology
LIFESTYLE
- Cosmetics
- Diets
- Vegetarianism and Veganism
TRADITIONS
- Christmas Traditions
NATURE
- Animals

- Fruits And Vegetables



ARTICLES IN THE BOOK

  1. AdSense
  2. AdWords
  3. Allinanchor command
  4. AutoLink
  5. BigTable
  6. Blogger
  7. CustomizeGoogle
  8. Deep link
  9. Egosurfing
  10. ElgooG
  11. Eric E. Schmidt
  12. Features of Gmail
  13. French military victories
  14. Froogle
  15. Gmail
  16. GMail Drive
  17. GmailFS
  18. Gmail Mobile
  19. Goobuntu
  20. Google
  21. Google.org
  22. Google Alerts
  23. Google Analytics
  24. Google and privacy issues
  25. Google Answers
  26. Googlebait
  27. Google Base
  28. Google bomb
  29. Google Book Search
  30. Googlebot
  31. Google Browser Sync
  32. Google Calendar
  33. Google Checkout
  34. Google China
  35. Google Code
  36. Google Code Search
  37. Google consultant
  38. Google Current
  39. Google Desktop
  40. Google Docs Spreadsheets
  41. Google Earth
  42. Google economy
  43. Googlefight
  44. Google File System
  45. Google Finance
  46. Google Foundation
  47. Google Founders' Award
  48. Google generation
  49. Google Groups
  50. Google Hacking
  51. Google Hacks
  52. Google Image Labeler
  53. Google Image Search
  54. 302 Google Jacking
  55. Google juice
  56. Google Labs
  57. Google Language Tools
  58. Google logo
  59. Google Maps
  60. Google News
  61. Google Notebook
  62. Google Pack
  63. Google Page Creator
  64. Google PC
  65. Googlepedia
  66. Google platform
  67. Googleplex
  68. Google Reader
  69. Google Scholar
  70. Google search
  71. Google Search Appliance
  72. Googleshare
  73. Google's hoaxes
  74. Google Summer of Code
  75. Google Talk
  76. Googletestad
  77. Google Toolbar
  78. Google Trends
  79. Google Video
  80. Google Video Marketplace
  81. Google Watch
  82. Google Web Accelerator
  83. Google Webmaster Tools
  84. Googlewhack
  85. Google WiFi
  86. Google X
  87. Googlism
  88. GTalkr
  89. Hello
  90. Hilltop algorithm
  91. History of Gmail
  92. History of Google
  93. I'm Feeling Lucky
  94. Joga Bonito
  95. Keyhole Markup Language
  96. Lawrence E. Page
  97. Link farm
  98. List of acquisitions by Google
  99. List of Google products
  100. MapReduce
  101. Measure Map
  102. Mediabot
  103. Mobile GMaps
  104. Orkut
  105. PageRank
  106. PhpGmailDrive
  107. Picasa
  108. Political Google bombs
  109. PR0
  110. Project 02
  111. Pyra Labs
  112. RoamDrive
  113. Schnitzelmitkartoffelsalat
  114. Scraper site
  115. Scroogle
  116. Search engine optimization
  117. SEO contest
  118. Sergey Brin
  119. Urchin Software Corporation
  120. Web traffic
  121. YouTube

 

 
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    ENGLISHGRATIS.COM è un sito personale di
    Roberto Casiraghi e Crystal Jones
    email: robertocasiraghi at iol punto it

    Roberto Casiraghi           
    INFORMATIVA SULLA PRIVACY              Crystal Jones


    Siti amici:  Lonweb Daisy Stories English4Life Scuolitalia
    Sito segnalato da INGLESE.IT

 
 



THE WORLD OF GOOGLE
This article is from:
http://en.wikipedia.org/wiki/BigTable

All text is available under the terms of the GNU Free Documentation License: http://en.wikipedia.org/wiki/Wikipedia:Text_of_the_GNU_Free_Documentation_License 

BigTable

From Wikipedia, the free encyclopedia

 

BigTable is a compressed, high performance and proprietary database built on Google File System (GFS), Chubby Lock Service and a few other Google programs; it is currently not distributed or used outside of Google. It was begun in 2004 [1] and is now used by a number of Google applications, such as MapReduce, which is often used for generating and modifying data stored in BigTable[2] Google Reader [3], Google Maps[4], Google Print, "My Search History", Google Earth, Blogger.com, Google Code hosting, and Orkut[4]. Google's reasons for developing its own database include licensing costs, scalability, and better control of performance characteristics.[5]

It is a fast and extremely large-scale system database, with a focus on quick reads from columns, not rows. It's designed to scale into the petabyte range across hundreds or thousands of machines, and to make it easy to add more machines to the system and automatically start taking advantage of those resources without any reconfiguration" [6]. Each table has multiple dimensions (one of which is a field for time, allowing versioning). Tables are optimized for GFS by being split into multiple tablets- segments of the table as split along a row chosen such that the tablet will be ~200 megabytes in size. When sizes threaten to grow beyond a specified limit, the tablets are compressed using the algorithms BMDiff and Zippy, which are described as not as space-optimal as LZW but more efficient in terms of computing time. The locations in the GFS of tablets are recorded as database entries in multiple special tablets, which are called "META1" tablets. META1 tablets are found by querying the single "META0" tablet, which typically has a machine to itself since it is often queried by clients as to the location of the "META1" tablet which itself has the answer to the question of where the actual data is located. Like GFS' master server, the META0 is not generally a bottleneck since the processor time and bandwidth necessary to discover and transmit META1 locations is minimal and clients aggressively cache locations to minimize queries.

See also

  • MapReduce
  • column-oriented DBMS

References

  1. ^ "First an overview. BigTable has been in development since early 2004 and has been in active use for about eight months (about February 2005)." Google's BigTable
  2. ^ "Bigtable can be used with MapReduce, a framework for running large-scale parallel computations developed at Google. We have written a set of wrappers that allow a Bigtable to be used both as an input source and as an output target for MapReduce job". pg 3 of "Bigtable: A Distributed Storage System for Structured Data", 2006
  3. ^ "Reader is using Google's BigTable in order to create a haven for what is likely to be a massive trove of items." Official Google Reader blog.
  4. ^ a b "There are currently around 100 cells for services such as Print, Search History, Maps, and Orkut." Google's BigTable
  5. ^ "We have described Bigtable, a distributed system for storing structured data at Google....Our users like the performance and high availability provided by the Bigtable implementation, and that they can scale the capacity of their clusters by simply adding more machines to the system as their resource demands change over time...Finally, we have found that there are significant advantages to building our own storage solution at Google. We have gotten a substantial amount of flexibility from designing our own data model for Bigtable." from the Conclusion of "Bigtable: A Distributed Storage System for Structured Data", 2006
  6. ^ *"Database War Stories #7: Google File System and BigTable"

External links

  • Bigtable: A Distributed Storage System for Structured Data -(official paper; PDF)
  • BigTable: A Distributed Structured Storage System (video)
    • more video
    • Google's BigTable -(notes on the official presentation)
  • "How Google Works"
  • "Google's BigTable" -(from the blog "Geeking with Greg")
  • C-Store and Google BigTable
  • Mondrian uses BigTable - by Guido van Rossum
Retrieved from "http://en.wikipedia.org/wiki/BigTable"