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SQL SERVER –Booklet 2- Gives you the interview tips in SQL Server

SQL SERVER Interview Questions-2014

KAASHIV INFOTECH

Welcomes you to the Expert Voice Corner

Mr.J.Venkatesan PrabuVenkatesan Prabu Jayakantham (venkat) has more than 8 years experience in the Microsoft Technologies such as VB.Net, ASP.Net, C#.net, SSIS, SSAS, ADO.Net, etc., He is the Managing Director of KAASHIVINFOTECH (http://www.kaashivinfotech.com/),a software company in Chennai. Before that, he worked in HCL Technologies (India and Australia) for six years as Project Lead. As a service motive, Venkat contributed more than 700 articles which is read by the developers in 170 countries (400 developers per day) (http://venkattechnicalblog.blogspot.com/). Aligned with KaaShiv InfoTech’s mission,he met more than 20,000 young minds and spreaded Microsoft Technologies / Career guidance programs. Venkat won many awards in his career, which includes Prestigious Microsoft MVP (Most Valuable Professional) award for the years 2008,2009,2010,2011,2012,2013 and won many awards. List of other awards in his career,

Microsoft certified Smart .Net Candidate in 2004

Most valuable member for dotnetspider site in 2007

HCL SQL Subject Matter expert (SME - SQL Server) for the year (2008,2009)

HCL Special contribution award winner on Dotnet skills for year(2008) HCL SQL

Knowledge Champion for the year 2009

Mind Cracker MVP on SQLServer –2010 for the year 2010,2011

INETA champion - Gold Member – 2010 for the year 2010 HCL Service Contribution

Award for the year 2010

Leading Lights "Rising Star" award from Common Wealth Bank, Australia for the year

2010

TECHNICAL CERTIFICATION

Cisco certified Network Associate (CCNA) – 2004

Microsoft Certified Application Developer (MCAD) – 2005

ACKNOWLEDGEMENT

I would like to thank my family members for their support and encouragement. Without their support it would be impossible for me to publish this e-book. I would also like to thank my KaaShiv InfoTech team for their support to publish this e-book.

DISCLAIMER

All rights reserved. No part of this book may be copied, adapted, abridged or stored in any retrieval system, computer system, photographic or other system or transmitted in any form or by any means without the prior written permission of the copyright holders. Any breach will entail legal action and permission without further notice.    

1. You setup a linked server from a SQL Server 2000 server to your new SQL Server 2005 server (with defaults), however you cannot execute procedures on the 2005 server. Why not? You need to enable RPC. By default, RPC is disabled in SQL Server 2005. You need to set the "remote access option" in your server configuration to 1 to allow the execution of stored procedures from a remote server.

2. What is the recommended way to send mail from SQLAgent in SQL Server 2005? Database Mail You can use either Database Mail or SQLMail with SQL Agent in SQL Server 2005. However since SQLMail will be removed, it is recommended that you use Database Mail.

3. When you create a new Message Type in the SQL Server 2005 Service Broker, what does the Authorization parameter signify?  The owner of the message type. This parameter determines the owner of the message type. This defaults to the current user.

4. What the heck does ATN2 do?  The angle between the x-axis and a ray. This is a mathematical function that returns the angle between the positive x-axis and the ray that passes through the two coordinates passed in. The angle is in radians.

5. How does a differential backup know which extents have changed so that it can be very quickly run?  The DCM tracks changes. The differential backup reads the extents from this structure. A differential backup uses the Differential Change Map to determine which extents have changed and need to be include in the backup. This greatly speeds the differential backup process.

6. What does the Queue Reader Agent do in SQL Server 2005 replication?  This agent reads the subscriber logs and moves changes back to the publisher. This agent is used when the queued update model is chosen with transactional replication. It moves changes from the subscribers back to the publishers.

7. What are the three possible functions of the plus (+) operator in SQL Server 2005, the base installed T-SQL?  Add, string concatenation, unary plus 

The three functions are Add, String Concatenation, and Unary Plus.

8.The Sort component in SQL Server 2005 Integration Services is what type of component?  Blocking Transformation The Sort component is a blocking transformation meaning that it needs all rows in order to perform its function.

9. Native Web Services require what type of endpoint in SQL Server 2005?  HTTP endpoints Native XML Web Services in SQL Server 2005 require HTTP endpoints to communicate with clients.

10. What do you mean by an execution plan? Why is it used? How would you view it?a.) An execution plan can be called as a road map that graphically or textually shows the data retrieval methods which have been chosen by the SQL Server query optimizer, for a stored procedure or ad- hoc query. 

b.) It is used because it is a very useful tool for a developer to understand the performance characteristics of a query or stored procedure. 

c.) There exists an option called "Show Execution Plan" in Query Analyzer. If this option is turned on, it will display query execution plan in separate window when the query is run again.

11. What is BCP? When does it used?BulkCopy is a tool used to copy huge amount of data from tables and views. BCP does not copy the structures same as source to destination. BULK INSERT command helps to import a data file into a database table or view in a user-specified format.

12. What is the difference between a Local and a Global temporary table?A local temporary table exists only for the duration of a connection or, if defined inside a compound statement, for the duration of the compound statement.A global temporary table remains in the database permanently, but the rows exist only within a given connection. When connection is closed, the data in the global temporary table disappears. However, the table definition remains with the database for access when database is opened next time.

13. What is the STUFF function and how does it differ from the REPLACE function?STUFF function is used to overwrite existing characters. Using this syntax, STUFF (string_expression, start, length, replacement_characters), string_expression is the string that will have characters substituted, start is the starting position, length is the number of characters in the string that are substituted, and replacement_characters are the new characters interjected into the string. REPLACE function to replace existing characters of all occurrences. Using the syntax REPLACE (string_expression, search_string, replacement_string), where every incidence of search_string found in the string_expression will be replaced with replacement_string.

14. What is PRIMARY KEY?A PRIMARY KEY constraint is a unique identifier for a row within a database table. Every table should have a primary key constraint to uniquely identify each row and only one primary key constraint can be created for each table. The primary key constraints are used to enforce entity integrity.

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 15. What is UNIQUE KEY constraint?A UNIQUE constraint enforces the uniqueness of the values in a set of columns, so no duplicate values are entered. The unique key constraints are used to enforce entity integrity as the primary key constraints.

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