Which database does Facebook & Google use ?

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Facebook has moved to a NoSQL database named HBase. Google uses their own system called BigTable. What is NoSQL ? NoSQL is a term used to designate databases which differ from classic relational databases. NoSQL database management systems are useful when working with a huge quantity of data when the data's nature does not require a relational model. The data can be structured, but NoSQL is used when what really matters is the ability to store and retrieve great quantities of data, not the relationships between the elements.
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How to Start SEO of a Website ?

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To start SEO i.e. Search Engine Optimization for a website, First you must do On Page Optimization and first step for On Page Optimization is Analysis of Website.

Staring Analysis of Website for SEO Activities 
 
If you want to do SEO for a website then your first step will be Analysis of Website. Before starting SEO for a website it is recommended note down the following SEO activities for your record.

Step 1: First of all check the domain name of website (Check it includes any important keyword related to theme of website) Check the theme of website.

Step 2: Check the content of website whether its related to theme of website.
Step 3: Check the content on Home Page (Should Not be less, Must be rich content)
Step 4: Use five important SEO operators and note down all the information as follows.

(a) Site: Check how much pages are indexed by various search engines. Note down in search engines Google, Yahoo and Bing.
(b) Link: Check how much backlinks are showing by various search engines.
(c) Info: Check the information of the website whether its is showing on the search engines or not.
(d) Cache: Check when Google Robots visits s last to the website.
(e) related: Check competitor websites with this operator.

Step 5: Note down the alexa rank of website.
Step 6: Note down the page rank of Website.
Step 7: Check the age of domain with help of www.who.is
Step 8: Check backlinks of the website with various tools like www.backlinkwatch.com
Step 9: Check Google Webmaster Tools, Bing Webmaster Tools, Yahoo Site Explorer is integrated with website or not.
Step 10: Install Google Analytics code if it is not presented.
Step 11: Use keyword analysis with help of Google Adwords Keyword Tool.
Step 12: Use brainstorming (What people are searching on the internet related to theme of website)
Step 13: Make meta tags for all web pages
Step 14: Check their is any image then do image optimization, Check how much video are presented on website also check website is using any flash file.
These are just basic steps for starting SEO of website. You can read details about Advanced SEO at here What is SEO ? What is On Page and Off Optimization ?

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