My SQL Server session in Chennai - One of the fabulous event

Writing in my blog after a very long time. Last month, I got a very nice opportunity to share my knowledge on SQL Server 2008 - Manageability features to chennai SQL experts.

It was a unforgottable experience and I enjoyed the whole day with my fellow MVP's. I came to know about me.

As usual am late:

My session is in the afternoon and am bit late for the session. I missed Pinal's morning session on spatial indexing. Anyway, I have attended his final session.

This program is well organised and the entire credit goes to the organisers Sugesh, Vidya sagar, Madhivanan and Deepak. No words to express my joyfullness in meeting all the technology experts at the same time in Chennai.

My Laptop problem:

Unfortunately, my laptop is not connecting to the Projector. We tried our level best but nothing works for me. Moved all my presentation materials to vidya sagar's laptop. Unfortunately, VS2010 demo is not working in his laptop. Atlast, I moved my presentation materials to Deepak's laptop. Thank god, It's working fine. Everyone is too friendly, but I couldn't come out from my tension. Had little bit of food and started my session.

My session:

Am bit tensed and faced a problem with SQL Server authentication. Deepak and vidya sagar understood my situation and helped me at the initial stage. Now, I am relaxed a little bit.

Below are the topics covered in my session,
1. Activity Monitor
2. Policy Based Management
3. Resource Governor
4. SQL Server Audit

I have provided the Sample scenario, Details and Sample demo for each topics.

My snap with other technology experts Vidya sagar, Madhu K.Nair, Mathivanan, Pinal Dave, Deepak and myself (To know more about these people, you can just google their names)

I got a friendly gift/honor from SQL Server Chennai User group (Gift from vidya sagar). All attendees have got a black colour T-shirt with CSSUG embossed on it. In addition to this, speakers should select 2 active attendees and those two will be rewarded with SQL Server related books. Speakers will put their autograph and presented the books to the active participants.

Special note on Pinal Dave:

OOPS, Pinal is an extra ordinary person. I can remember he speaks atleast 30 minutes continuously on seeing me. He had the capability to talk on any topics for atleast 1 hour :-) (Just kidding). Too realistic, too jovial, too friendly and finally a very strong SQL Server expert. Proud to tell you all that, I am a big fan of Pinal Dave.

Anyway, Thanks to CSSUG organisers for providing me a very nice opportunity to share my knowledge and to meet everyone.

Venkatesan Prabu .J


Pinal Dave said...

Thank you my friend.

You are very very kind and you are very polite with your words.

Your session was flawless and we all enjoyed it. The best part was I got the same feedback from many who attended the session.

Kind Regards,

Deepak said...

Thank you Venkatesan ! We sincerely appreciate your help for coming all the way from Australia to Chennai and sharing your immense knowledge.

laptop chennai said...

Its nice to see sharing your experience

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My T-SQL Gallery @code.msdn.microsoft

Created my own T-SQL Gallery in Microsoft site. Do visit the same and share your feedback,


Thanks and Regards,
Venkatesan Prabu .J

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.

Select Statement in SQL Server

Select Statement in SQL Server

String Functions in sql server

String Functions in sql server

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!!!
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.

Best Joke - Enjoy it

Best Joke - Enjoy it