Welcome to SQLServer MVP Blog

Venkatesan Prabu MCITP,MCAD,MCTS,CCNA. Worked as a ProjectLead(Senior .Net developer,SQL DBA). Now, Managing Director of KAASHIV INFO TECH, Chennai This Blog aims in serving the community in a better way. This blog is read by developers in 159 countries with average of 400 hits per day. Please post your valuable suggestions and hold my hand to serve the community. Lets make a new world with good thoughts and good minds....... This blog serves the SQL server community all over the world.

28.10.17

CSS - css tutorial - Article by Microsoft MVP - Animated Artciles

*4 lines Tech Knowledge on CSS - crispy definiton to strengthen your career*

*Day 32*
Still 881 Technologies to learn

*Learn CSS - Cascade Style Sheet coding Today*

*Key Points about CSS :*
1. CSS provides design to the html web page and controls in the page.
2. CSS can be called via external, internal and inline.
3. CSS uses tag elements, id selector and attribute selector to identify the elements in the wbe page.
4. ID Selector is used to color the elements in the page with the specified ID.

Check 200 Animated articles on CSS
https://www.wikitechy.com/css/

*Partnership withour company*
Check out the URL - https://www.wikitechy.com/join-wikitechy

*Upcoming Technology* - Hacking, Twig, PIG , HBase, Azure, Ionic Mobile App, Cython

Please share this msg to your friends. Let spread good things to others

Cheers,
Venkatesan Prabu.J
Microsoft Awarded MVP - Azure

27.10.17

javascript - javascript tutorial - By Microsoft Awarded MVP

*5 lines Tech Knowledge - crispy definiton to strengthen your career*

*Day 31*
Still 882 Technologies to learn

*Learn JavaScript - Client side coding Today*

*Key Points about JavaScript :*
1. Javascript provides client side validation and avoid server round trip for data validation.
2. All modern browser support javascript
3. Javascript engine is an interpreter which will interprets javascript and execute it.
4. Javascript can be written in client side and also in server side now.
5. Famous data format ->created from javascript world is JSON(Javascript Object Notation)

Check 200 Animated articles on JavaScript
https://www.wikitechy.com/tutorials/javascript/javascript-tutorial

*Partnership withour company*
Check out the URL - https://www.wikitechy.com/join-wikitechy

*Tomorrow Technology* - Twig, PIG , HBase, Azure, Ionic Mobile App, Cython

Please share this msg to your friends. Let spread good things to others

Cheers,
Venkatesan Prabu.J
Microsoft Awarded MVP - Azure

Apache - Apache web server - Apache tutorial - By Microsoft Awarded MVP

*4 lines Tech Knowledge - crispy definiton to strengthen your career*

*Day 30*
Still 883 Technologies to learn

*Learn Apache - Web Server Today*

*Key Points about Apache :*
1. Apache a universal web server used to host PHP websites in most of the OS like windows, linux and unix platforms.
2. More than 50% of market share in Web server world is occupied by Apache server
3. Completely open source, we can change the code based on our requirement.
4. It's open source available for free of cost

Check 50 Animated articles on Apache
https://www.wikitechy.com/tutorials/apache/apache-tutorial

Check 50 Animated articles on Azure
https://www.wikitechy.com/tutorials/azure/azure-tutorial

*Partnership withour company*
Check out the URL - https://www.wikitechy.com/join-wikitechy

*Tomorrow Technology* - PIG , HBase, Azure, Ionic Mobile App, Cython

Please share this msg to your friends. Let spread good things to others

Cheers,
Venkatesan Prabu.J
Microsoft Awarded MVP - Azure

Microsoft Azure - Microsoft Azure tutorial - By Microsoft Awarded MVP

*3 lines Tech Knowledge - crispy definiton to strengthen your career*

*Day 29*
Still 884 Technologies to learn

*Learn Azure - Cloud Computing Today*

*Key Points about Microsoft Azure :*
1. Cloud computing of Microsoft is Azure Platform.
2. Deployed Web application into Azure is called WebApps
3. IAAS (VM's), PAAS and SAAS are major types to cloud - More than 600 Azure services were supported

Check 50 Animated articles on Azure
https://www.wikitechy.com/tutorials/azure/azure-tutorial

*Partnership withour company*
Check out the URL - https://www.wikitechy.com/join-wikitechy

*Tomorrow Technology* - Apache, PIG , HBase, Azure, Ionic Mobile App, Cython

Please share this msg to your friends. Let spread good things to others

Cheers,
Venkatesan Prabu.J
Microsoft Awarded MVP - Azure

atom - Atom Editor - Atom Editor tutorial - By Microsoft Awarded MVP

*4 lines Tech Knowledge - crispy definiton to strengthen your career*

*Day 28*
Still 885 Technologies to learn

*Learn Git - Atom Editor Today*

*Key Points about Atom Editor :*
1. Developed by GIT, Open source, Free colorful editor
2. Works with all platform windows, linux, MAC, nodejs, Git environment
3. Atom editor is written in Coffeescript
4. Supports Git Integration, folder difference calc, file diff calc, merge files, find and replace files and folders, themes, linter and jshint integration, keybind supports.

Check 50 Animated articles on Atom
https://www.wikitechy.com/tutorials/atom/atom-tutorial

*Partnership withour company*
Check out the URL - https://www.wikitechy.com/join-wikitechy

*Tomorrow Technology* - Apache, botframework, PIG , HBase, Azure, Ionic Mobile App, Cython

Please share this msg to your friends. Let spread good things to others

Cheers,
Venkatesan Prabu.J
Microsoft Awarded MVP - Azure

Apache JMeter - Apache JMeter tutorial - By Microsoft Awarded MVP

*3 lines Tech Knowledge - crispy definiton to strengthen your career*

*Day 27*
Still 886 Technologies to learn

*Learn Apache JMeter- Testing tool Today*

*Key Points abt Apache JMeter :*
1. Highly compatible Desktop based Testing tool for Java Based Applications.
2. It is used to test the performance, load, stress, regression and functional testing on Java applications.
3. Apache Jmeter provides a enormous custom statistical reports on performance.

Check 100 Animated articles on Apache Jmeter
https://www.wikitechy.com/tutorials/jmeter/jmeter-apache

*Partnership withour company*
Check out the URL - https://www.wikitechy.com/join-wikitechy

*Tomorrow Technology* - Apache, botframework, PIG , HBase, Azure, Ionic Mobile App, Cython

Please share this msg to your friends. Let spread good things to others

Cheers,
Venkatesan Prabu.J
Microsoft Awarded MVP - Azure

OAuth - OAuth tutorial - By Microsoft Awarded MVP

*2 lines Tech Knowledge - crispy definiton to strengthen your career*

*Day 26*
Still 887 Technologies to learn

*Learn OAuth - Security Today*

*Key Points abt OAuth :*
1. Most of the big companies Microsoft, Facebook, Twitter, Google were using OAuth as authentication mechanism for user access mechanism (Approx Billions of companies implemented now).
2. Oauth provides a third party applications to access the websites without sharing the password to the third party websites - Ex: Via Bank accounts we are purchasing products in Amazon site. We are not providing the password to the amazon site. But via amazon, we logged into bank sites to pay.

Check 100 Animated articles on OAUTH
https://www.wikitechy.com/tutorials/oauth/oauth-tutorial

*Partnership withour company*
Check out the URL - https://www.wikitechy.com/join-wikitechy

*Tomorrow Technology* - PIG , HBase, Azure, Ionic Mobile App, Cython

Please share this msg to your friends. Let spread good things to others

Cheers,
Venkatesan Prabu.J
Microsoft Awarded MVP - Azure

Android - Android tutorial - By Microsoft Awarded MVP

*4 lines Tech Knowledge - crispy definiton to strengthen your career*

*Day 25*
Still 888 Technologies to learn

*Learn Android Today*

*Key Points abt Android:*
1. Android provides an open source platform for Mobile App Development
2. Android code is also named as native code. Can be created with many s/w - major one is Android Studio and Eclipse.
3. Screen navigation is termed as intent
4. Code can be executed via emulators. Famous ones are GenyMotion, archon, andy, bluestack

Check 200 Animated articles on Android
https://www.wikitechy.com/tutorials/android/android-tutorial

*Partner in our mission*
Check out the URL - https://www.wikitechy.com/join-wikitechy

Please share this msg to your friends. Let spread good things to others

Cheers,
Venkatesan Prabu.J
Microsoft Awarded MVP - Azure

Dojo - Dojo tutorial - By Microsoft Awarded MVP

*Learn Dojo Today*

*Key Points :*
1. Dojo - A javascript framework enables the website to work with all the browsers and its features.
2. It supports internalization, localization for a website

Check basic articles on DOJO
https://www.wikitechy.com/tutorials/dojo/dojo-tutorial

Couchdb - Couchdb tutorial - By Microsoft Awarded MVP

*Learn Couchdb Today*

*Key Points :*
1. Well familiar nosql database, a json based document store which emphasize Availability of the data and Partition Tolerance of data.
2. Irrespective of ACID property, it works on BASE property ( Basically Available, Soft State, Eventual Consistency)
3. Couch DB - Work with HTTP/REST API and its written in Erlang

Check basic articles on Couchdb
https://wikitechy.com/tutorials/couchdb/couchdb-tutorial

Couchbase - Couchbase tutorial - By Microsoft Awarded MVP

*8 lines Knowledge - crispy knowledge to strengthen your career - Day 24 - Still 889 Technologies to learn*

*Learn Couchbase Today*

*Key Points :*
1. Membase + couch db = Couch base
2. Couchbase is well suited for distributed systems and it provides a high performance db server
3. Couchbase works(Import data to hadoop) with hadoop through couchdoop technology

Check basic articles on Couchbase
https://wikitechy.com/tutorials/couchbase/couchbase-tutorial

R-Programming - ggplot tutorial - By Microsoft Awarded MVP

*Learn R-Programming-ggplot Today*

*Key Points :*
1. Graphical component associated with R-program.
2. Data Visualization tool to convert graphs into semantic components such as layers and scales.
3. It can be used with python language and matlab too.

Check basic articles on R-Programming-ggplot
https://www.wikitechy.com/tutorials/ggplot2/ggplot2-tutorial

Gerrit - Gerrit tutorial - By Microsoft Awarded MVP

*3 lines Knowledge - crispy knowledge to strengthen your career - Day 23 - Still 892 Technologies to learn*

*Learn Gerrit Today*

*Key Points :*
1. Gerrit is a code colloboration tool used to maintain a common code for all the users in the team.
2. It's a web based distributed code version management tool.
3. Provides high flexibility of controlling the code(With its approve/reject change features)

Check basic articles on Gerrit
https://www.wikitechy.com/tutorials/gerrit/gerrit-tutorial

Angular Material - Angular Material tutorial - By Microsoft Awarded MVP

*4 lines Knowledge - crispy knowledge to strengthen your career - Learn Angular Material Today*

*Key Points :*
1. Best UI component for Angular JS web developers.
2. Helps to create faster, beautiful and responsive websites.
3. Used to create website which will fit any screen size.
4. Color and shades remain same in any platform & devices

100 Animated/Picture based articles on angular material

https://www.wikitechy.com/tutorials/angular-material/angular-material-tutorial

*Technical Part time job - Get paid to test the articles (Quality and Content)*
Articles are based on to Big Data / Cloud / Hacking / Web based and Mobile based.

http://www.work.wikitechy.com/

Cheers,
Venkatesan Prabu.J
Microsoft Awarded MVP

Elastic Search - Elastic Search Tutorial - - By Microsoft Awarded MVP

*5 lines - crispy knowledge to strengthen your career - Learn Elastic Search Today*

*Key Points :*
1. Elastic Search - Open source search engine API used in all the latest technologies and big companies like fb, twitter and microsoft.
2. Kibana is used for visualization and it provides great support in big data analytics too.
3. One of the hottest technology ranked by google in 2017 in the field of search APIs
4. Search engine API highly compatible with SPA applications(Anglular JS)
5. Solr provides text oriented search whereas elastic search provides analytics based search functionality

200 Animated/Picture based articles on elasticsearch

https://www.wikitechy.com/tutorials/elasticsearch/elasticsearch-basic-concepts

*Technical Part time job - Get paid to test the articles (Quality and Content)*
Articles are based on to Big Data / Cloud / Hacking / Web based and Mobile based.

http://www.work.wikitechy.com/

Cheers,
Venkatesan Prabu.J
Microsoft Awarded MVP

Ruby on Rails - Ruby on Rails tutorial - By Microsoft Awarded MVP

*Learn Ruby on Rails - 10 times faster web application framework than PHP*

*Key Points:*
1. Ruby on Rails Framework works with Ruby Language
2. A Complete MVC Framework
3. Ruby data can be embedded in HTML via Embedded Ruby Language
4. Rails works well in processing big data and much more compatible to mongodb

Check our 200 animated/picture articles on Ruby on Rails

https://www.wikitechy.com/tutorials/ruby-on-rails/ruby-on-rails-tutorial

*Get paid to test our articles (Quality and Content)*
Articles related to Big Data / Cloud / Hacking / Web based and Mobile based.

http://www.work.wikitechy.com/

Cheers,
Venkatesan Prabu.J
Microsoft Awarded MVP

Subscribe to: Posts (Atom)

SQL Server Interview questions - Part 1

What is the significance of NULL value and why should we avoid permitting null values?
Null means no entry has been made. It implies that the value is either unknown or undefined.We should avoid permitting null values because Column with NULL values can't have PRIMARY KEY constraints. Certain calculations can be inaccurate if NULL columns are involved.

What is SQL whats its uses and its component ?
The Structured Query Language (SQL) is foundation for all relational database systems. Most of the large-scale databases use the SQL to define all user and administrator interactions. It enable us to retrieve the data from based on our exact requirement. We will be given a flexibility to store the data in our own format.

The DML component of SQL comprises four basic statements:
* SELECT to get rows from tables
* UPDATE to update the rows of tables
* DELETE to remove rows from tables
* INSERT to add new rows to tables

What is DTS in SQL Server ?
Data Transformation Services is used to transfer the data from one source to our required destination. Considering am having some data in sql server and I need to transfer the data to Excel destination. Its highly possible with dialogue based tool called Data Transformation services. More customization can be achieved using SSIS. A specialized tool used to do such migration works.

What is the difference between SQL and Pl/Sql ?

Straight forward. SQL is a single statement to finish up our work.Considering, I need some data from a particular table. “Select * from table” will fetch the necessary information. Where as I need to do some row by row processing. In that case, we need to go for Procedural Logic / SQL.

What is the significance of NULL value and why should we avoid permitting null values?
Null means no entry has been made. It implies that the value is either unknown or undefined.We should avoid permitting null values because Column with NULL values can't have PRIMARY KEY constraints. Certain calculations can be inaccurate if NULL columns are involved.

Difference between primary key and Unique key?
Both constraints will share a common property called uniqueness. The data in the column should be unique. The basic difference is,
· Primary key won’t allow null value. Whereas, unique key will accept null value but only one null value.
· On creating primary key, it will automatically format the data inturn creates clustered index on the table. Whereas, this characteristics is not associated with unique key.
· Only one primary key can be created for the table. Any number of Unique key can be created for the table.

SQL Server Interview Question - Part 2

What is normalization?

Normalization is the basic concept used in designing a database. Its nothing but, an advise given to the database to have minimal repetition of data, highly structured, highly secured, easy to retrieve. In high level definition, the Process of organizing data into tables is referred to as normalization.

What is a stored procedure:
Stored procedures are precompiled T-SQL statements combined to perform a single task of several tasks. Its basically like a Macro so when you invoke the Stored procedure, you actually run a set of statements. As, its precompiled statement, execution of Stored procedure is compatatively high when compared to an ordinary T-SQL statement.

What is the difference between UNION ALL Statement and UNION ?
The main difference between UNION ALL statement and UNION is UNION All statement is much faster than UNION,the reason behind this is that because UNION ALL statement does not look for duplicate rows, but on the other hand UNION statement does look for duplicate rows, whether or not they exist.

Example for Stored Procedure?
They are three kinds of stored procedures,1.System stored procedure – Start with sp_2. User defined stored procedure – SP created by the user.3. Extended stored procedure – SP used to invoke a process in the external systems.Example for system stored proceduresp_helpdb - Database and its propertiessp_who2 – Gives details about the current user connected to your system. sp_renamedb – Enable you to rename your database

What is a trigger?

Triggers are precompiled statements similar to Stored Procedure. It will automatically invoke for a particular operation. Triggers are basically used to implement business rules.

What is a view?
If we have several tables in a db and we want to view only specific columns from specific tables we can go for views. It would also suffice the needs of security some times allowing specfic users to see only specific columns based on the permission that we can configure on the view. Views also reduce the effort that is required for writing queries to access specific columns every time.

What is an Index?
When queries are run against a db, an index on that db basically helps in the way the data is sorted to process the query for faster and data retrievals are much faster when we have an index.

What are the types of indexes available with SQL Server?

There are basically two types of indexes that we use with the SQL ServerClustered -

1. It will format the entire table, inturn physically sort the table.

2. Only one clustered index can be created for a table.

3. Data will be located in the leaf level.

4. By default, primary key will create clustered index on the table.

Non-Clustered Index

1. It wont touch the structure of the table.

2. It forms an index table as reference to the exact data.

3. A reference to the data will be located in the leaf level.

4. For a table, we can create 249 non clustered index.

Happy Learning!!!
Regards,
Venkatesan Prabu .J

SQL Interview question

Extent Vs Page?

Pages are low level unit to store the exact data in sql server. Basically, the data will be stored in the mdf, ldf, ndf files. Inturn, pages are logical units available in sql server.The size of the page is 8KB.

Eight consecutive pages will form an extent 8 * 8KB = 64KB.

Thus I/O level operation will be happening at pages level.The pages will hold a template information at the start of each page (header of the page).

They are,

1. page number,

2. page type,

3. the amount of free space on the page,

4. the allocation unit ID of the object that owns the page.

Extents will be classifed into two types,

1. Uniform extents

2. Mixed extents

Uniform Extents:It occupied or used by a single object. Inturn, a single object will hold the entire 8 pages.Mixed

Extents:Mulitple objects will use the same extent. SQL Server will allow a max of eight objects to use a shared extent.

Property of SQL Server :Initally if an object is created, sql server will allocate the object to the mixed extent and once if the size reaches 8 pages and more... immediately, a new uniform extent will be provided for that particular object.

Herecomes, our fragmentation and reindexing concepts.