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Daily Archives: April 9, 2015

GUID causes fragmentation in Clustered Indexes

09 Thursday Apr 2015

Posted by Pawan Kumar Khowal in SQL Concepts, SQL SERVER, SQL Server Interview Questions

≈ 3 Comments

Tags

Clustered Indexes, Fragmentation, fragmentation Clustered, fragmentation in Clustered Indexes, GUID causes fragmentation in Clustered Indexes, GUID fragmentation, GUID SQL, Interesting Interview Questions, Interview Qs.SQL SERVER Questions, Interview questions, Interview Questions on SQL, InterviewQuestions, InterviewQuestions for SQL, puzzle sql developer, Queries for SQL Interview, SELECT Puzzle, SQL, SQL 2012, SQL 2014, SQL 2014 Interview Questions, SQL Interview Questions, SQL Joins, SQL Queries, SQL Quiz, SQL Server Database, SQL SERVER Interview questions, SQL Skills, SQL Tricky question, sql/database interview for puzzle sql developer, SQLSERVER, T SQL Puzzles, Tricky Questions, TSQL, TSQL Interview questions, TSQL Queries


How GUIDs can cause fragmentation in clustered indexes

Reference – http://www.sqlskills.com/blogs/paul/can-guid-cluster-keys-cause-non-clustered-index-fragmentation/

A GUID Key will create fragmentation(Fragmentation means the data is stored non-contiguously on disk) because it is random in nature and its size is also on a very higher side. A GUID is of 16 bytes, four times the space of an 4-byte integer. So every time when you insert a row in the index SQL has to search the insertion point in the B-tree and since the value we are expecting is random hence the insertion point is also random.

This means that if an index page is full, a random insert that happens to have to go onto that page will cause a page split to make room for the new record. A page-split is where a new page is allocated and (as near as possible to) half the rows from the splitting page are moved to the new page. The new row is then inserted into one of the two pages, determined by the key value. Usually the newly allocated page is not physically contiguous to the splitting page, and so fragmentation has been caused.

In this case *two* kinds of fragmentation have been caused-

1. Logical fragmentation – Here the next logical page as determined by the index order is not the next physical page in the data file.

2. Physical (or internal) fragmentation – Here the space is being wasted on index pages.

These can both affect query performance, as well as the expense of having to do the page split in the first place.

Check out the example below – I’ll create a clustered index with GUID. Let’s see what happens when we insert 10000 rows:

--

CREATE TABLE TestClusteredKeyFragmentation
(
ID UNIQUEIDENTIFIER DEFAULT NEWID (),
Dates DATETIME DEFAULT GETDATE ()
)

CREATE CLUSTERED INDEX Ix_ID ON TestClusteredKeyFragmentation (ID)
GO

INSERT INTO TestClusteredKeyFragmentation DEFAULT VALUES
GO 10000

--Execute the below query and check the details
SELECT
   OBJECT_NAME (ips.[object_id]) AS 'Object Name',
   si.name AS 'Index Name',
   ROUND (ips.avg_fragmentation_in_percent, 2) AS 'Fragmentation',
   ips.page_count AS 'Pages',
   ROUND (ips.avg_page_space_used_in_percent, 2) AS 'Page Density'
FROM sys.dm_db_index_physical_stats (DB_ID('InMemory'), NULL, NULL, NULL, 'DETAILED') ips
CROSS APPLY sys.indexes si
WHERE
   si.object_id = ips.object_id
   AND si.index_id = ips.index_id
   AND ips.index_level = 0
   AND OBJECT_NAME (ips.[object_id]) = 'TestClusteredKeyFragmentation'
GO
--

The TestClusteredKeyFragmentation clustered index 98.41% fragmented, with around 35% space being wasted on each page. Hence we should never use GUID as Keys. They uses 16 bytes which is four times then the normal integer fields used to take and this space is wasted everywhere. They also expensive in joins and takes more time to perform lookup.

We should always use Integer fields for Primary Key if possible. If you still want to learn more on this topic then click Pauls blog (Paul is the best in SQL SERVER ) – http://www.sqlskills.com/blogs/paul/can-guid-cluster-keys-cause-non-clustered-index-fragmentation/

Keep learning. We all need to learn.

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Explicitly inserting data into an IDENTITY column

09 Thursday Apr 2015

Posted by Pawan Kumar Khowal in SQL SERVER, SQL Server Interview Questions, T SQL Puzzles

≈ Leave a comment

Tags

Complex SQL Challenges, Complex TSQL Challenge, Explicitly inserting data into an IDENTITY column, How to Insert Values into an Identity Column in SQL Server, Identity Column in SQL Server, Identity Insert, Indentity Column insertion, Interesting Interview Questions, Interview Qs.SQL SERVER Questions, Interview questions, Interview Questions on SQL, InterviewQuestions, InterviewQuestions for SQL, Learn complex SQL, Learn SQL, Learn T-SQL, PL/SQL Challenges, puzzle sql developer, Queries for SQL Interview, SELECT Puzzle, SQL, SQL 2012, SQL 2014, SQL 2014 Interview Questions, SQL Challenge, SQL Challenges, SQL Identity, SQL Identity column, SQL Interview Questions, SQL Joins, SQL pl/sql puzzles, SQL Queries, SQL Quiz, SQL Server Database, SQL SERVER Interview questions, SQL Skills, SQL Sudoku, SQL Tricky question, sql/database interview for puzzle sql developer, SQLSERVER, T SQL Puzzles, T-SQL Challenge, Tough SQL Challenges, Tough SQL Puzzles, Tricky Questions, TSQL, TSQL Challenge, TSQL Challenges, TSQL Interview questions, TSQL Queries


Explicitly inserting data into an IDENTITY column / How to Insert Values into an Identity Column in SQL Server

Identity Columns are commonly used as primary keys in database tables.  These columns automatically assign a value for each new row inserted. We can explicitly insert data into an identity column using below methods.

MULTIPLE COLUMNS – One of the columns is Identity

--
/*
Explicitly inserting data into an IDENTITY column
OR
How to Insert Values into an Identity Column in SQL Server
*/

--In case of Multiple Columns

CREATE TABLE testIdentityMultipleColumn
(
	 ID INT IDENTITY(1,1)
	,Name VARCHAR(1)
)
GO

SET IDENTITY_INSERT testIdentityMultipleColumn ON

INSERT INTO testIdentityMultipleColumn
(ID,NAME) VALUES ( 1 , 'P' )

SET IDENTITY_INSERT testIdentityMultipleColumn OFF

--


SINGLE COLUMN – IDENTITY

In case of Single Column

--
/*
Explicitly inserting data into an IDENTITY column
OR
How to Insert Values into an Identity Column in SQL Server
*/

--In case of Single Column

CREATE TABLE testIdentity
(
	ID INT IDENTITY(1,1)
)
GO

INSERT INTO testIdentity DEFAULT VALUES
--

Note – Please note that we CANNOT update the value present in the Identity Column. Keep learning. We all need to learn.

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http://Pawankkmr.Wordpress.com

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SQL Puzzle | 5 Ways to GET DISTINCT DATA without using distinct Keyword | SQL Interview Question

09 Thursday Apr 2015

Posted by Pawan Kumar Khowal in SQL Concepts, SQL SERVER, SQL Server Interview Questions, T SQL Puzzles

≈ 1 Comment

Tags

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SQL Puzzle | 5 Ways to GET DISTINCT DATA without using distinct Keyword | SQL Interview Question

In this post we will understand what are the multiple ways to find distinct rows without using distinct Keyword.

As far as I know methods we can use here are-

  • 1. Using UNION
  • 2. Using RowNumber
  • 3. Using GroupBy
  • 4. Using EXCEPT
  • 5. Using INTERSECT

Sample script to create table and different methods are given below.


--

--Multiple Ways to Find Distinct Values

CREATE TABLE Duplicate
(
	ID INT
)
GO

INSERT INTO Duplicate(ID) VALUES (1),(1),(2),(2),(2),(1),(1),(1)
GO

SELECT * FROM Duplicate
GO

--

Current Data

--

ID
-----------
1
1
2
2
2
1
1
1

(8 rows affected)


--

Sample Testing

–Method 1 – Using UNION


--

SELECT ID from Duplicate
UNION
SELECT TOP 1 ID FROM Duplicate


--

OUTPUT

--

ID
-----------
1
2

(2 rows affected)



--

–Method 2 – Using Row Number


--

SELECT ID 
FROM 
(
	SELECT ID , ROW_NUMBER() OVER (PARTITION BY ID ORDER BY ID) rnk FROM Duplicate 
)a
WHERE rnk = 1

--

OUTPUT

--

ID
-----------
1
2

(2 rows affected)



--

–Method 3 – Using Group By


--

SELECT ID FROM Duplicate GROUP By ID

--

OUTPUT

--

ID
-----------
1
2

(2 rows affected)



--

–Method 4 – Using EXCEPT


--

SELECT ID from Duplicate
EXCEPT
SELECT NULL /* Provide any value which you do not expect in the table*/

--

OUTPUT

--

ID
-----------
1
2

(2 rows affected)



--

–Method 5 – Using INTERSECT


--

SELECT ID from Duplicate
INTERSECT
SELECT ID FROM Duplicate

--

OUTPUT

--

ID
-----------
1
2

(2 rows affected)



--

Please add a comment if you have any other or better solution in mind. I would love to learn it. We all need to learn. Thanks in advance.

Pawan Khowal

Pawan is a SQL Server Developer. If you need any help in writing code/puzzle or training please email at – pawankkmr”AT”gmail.com. Meanwhile please go throgh the top pages from his blog.

Page Detail URL
☛ SQL Advance Puzzles https://msbiskills.com/tsql-puzzles-asked-in-interview-over-the-years/
☛ SQL Tricky Queries https://msbiskills.com/sql-puzzles-finding-outputs/
☛ SQL Server Perfomance tuning Articles https://msbiskills.com/sql-performance-tuning/
☛ SQL Server Articles https://msbiskills.com/t-sql/
☛ SQL Interview Questions & Answers https://msbiskills.com/sql-server-interview-questions/

My SQL Groups on Facebook:

1. If you like this post, you may want to join my SQL SERVER Interview Puzzles/Interview Questions on Facebook: https://www.facebook.com/groups/1430882120556342/

2. If you like this post, you may want to join my SQL Server Puzzles on Facebook:
https://www.facebook.com/groups/206594023090781/

My SQL Page on Facebook:

2. For all the updates you may follow my page -> https://www.facebook.com/MSBISkillscom-1602779883299222/

Enjoy !!! Keep Learning

Http://MsbiSkills.com

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SQL Puzzle | INSERT multiple rows with single Insert Keyword | SQL Interview Question

09 Thursday Apr 2015

Posted by Pawan Kumar Khowal in SQL Concepts, SQL SERVER, SQL Server Interview Questions, T SQL Puzzles

≈ Leave a comment

Tags

Complex SQL Challenges, Complex TSQL Challenge, Insert statment to insert multiple rows, Interesting Interview Questions, Interview Qs.SQL SERVER Questions, Interview questions, Interview Questions on SQL, InterviewQuestions, InterviewQuestions for SQL, Learn complex SQL, Learn SQL, Learn T-SQL, Methods to insert multiple rows using single insert keyword, Multiple rows using single insert keyword, PL/SQL Challenges, puzzle sql developer, Queries for SQL Interview, SELECT Puzzle, SQL, SQL 2012, SQL 2014, SQL 2014 Interview Questions, SQL Challenge, SQL Challenges, SQL Interview Questions, SQL Joins, SQL pl/sql puzzles, SQL Queries, SQL Quiz, SQL Server Database, SQL SERVER Interview questions, SQL Skills, SQL Sudoku, SQL Tricky question, sql/database interview for puzzle sql developer, SQLSERVER, T SQL Puzzles, T-SQL Challenge, Tough SQL Challenges, Tough SQL Puzzles, Tricky Questions, TSQL, TSQL Challenge, TSQL Challenges, TSQL Interview questions, TSQL Queries, Ways to insert multiple rows


SQL Puzzle | INSERT multiple rows with single Insert Keyword | SQL Interview Question

OR

Different Methods to Insert multiple rows using single Insert Keyword

In this post we will understand what are the different methods for inserting records from a table, each of them has its own pros and cons.

The condition here it that you can only use the INSERT keyword once.

Notes –
1. Most interviewers asks this question in SQL interview.
2. These will help in your SQL development and unit testing tasks as you will get how quickly you can insert the data based on your requirement.

The Methods are-

  1. Using UNION ALL
  2. Using Comma Separated
  3. Using SELECT and Comma
  4. Using GO
  5. Using Loop

Method 1. Insert multiple ROWS using single INSERT Keyword – Using UNION ALL

In this method you have to write many statements including UNION ALL & SELECT.


--USING UNION ALL

CREATE TABLE testMultipleInsertUNIONALL
(
 ID INT
,NAME VARCHAR(1)
)
GO

INSERT INTO testMultipleInsertUNIONALL
SELECT 1,'A'
UNION ALL
SELECT 2,'B'
UNION ALL
SELECT 3,'C'
UNION ALL
SELECT 4,'D'
UNION ALL
SELECT 5,'E'
UNION ALL
SELECT 6,'F'

--

Method 2. Insert multiple ROWS using single INSERT Keyword – Using Comma Separated

In this method you have to pass different rows using comma separated values. This is one of the best and the mostly used method across.

Note – This is the most widely used method to insert multiple rows.


--

--USING COMMA SEPERATED

CREATE TABLE testMultipleInsertCommaSeperated
(
	 ID INT
	,NAME VARCHAR(1)
)
GO

INSERT INTO testMultipleInsertCommaSeperated(ID,NAME)
VALUES
(1,'A'),
(2,'B'),
(3,'C'),
(4,'D'),
(5,'E'),
(6,'F')

--

3. Using SELECT and Comma

We can use below method also to insert multiple rows using single insert keyword. Although this method is not widely used.

--

--USING SELECT AND COMMA

CREATE TABLE testMultipleInsertSelectComma
(
	 ID INT
	,NAME VARCHAR(1)
)
GO

INSERT INTO testMultipleInsertSelectComma VALUES
(
	(SELECT 1), (SELECT 'Z')
)
,
(
	(SELECT 2), (SELECT 'K')
)
,
(
	(SELECT 3), (SELECT 'Q')
)
,
(
	(SELECT 4), (SELECT 'I')
)
,
(
	(SELECT 5), (SELECT 'M')
)
GO

--

4. Using GO

Using this method we can only insert multiple rows with same values. This will be of great help is you just have to insert default values. Please check out the sample example below.


--

--USING GO Statement

CREATE TABLE testMultipleInsertGO
(
	 ID INT IDENTITY(1,1)
	,DATES DATETIME DEFAULT GETDATE()
)
GO

INSERT INTO testMultipleInsertGO DEFAULT VALUES
GO 5

Once you run the above example below output will come.

InsertMultipleRowsWithGo

5. Using Loop

Using While loop also we can insert multiple rows in a table. Please find the sample SQL statements below.


--

CREATE TABLE testMultipleInsertLoop
(
	 ID INT IDENTITY(1,1)
	,DATES DATETIME DEFAULT GETDATE()
)
GO

DECLARE @a INT;
SELECT @a = 1;
WHILE (@a < 10)
BEGIN
   INSERT INTO testMultipleInsertLoop DEFAULT VALUES;
   SET @a = @a + 1;
END;
GO

--

Add a comment if you have any other or better solution in mind. I would love to learn it. We all need to learn.

Pawan Khowal

Pawan is a SQL Server Developer. If you need any help in writing code/puzzle or training please email at – pawankkmr”AT”gmail.com. Meanwhile please go throgh the top pages from his blog.

Page Detail URL
☛ SQL Advance Puzzles https://msbiskills.com/tsql-puzzles-asked-in-interview-over-the-years/
☛ SQL Tricky Queries https://msbiskills.com/sql-puzzles-finding-outputs/
☛ SQL Server Perfomance tuning Articles https://msbiskills.com/sql-performance-tuning/
☛ SQL Server Articles https://msbiskills.com/t-sql/
☛ SQL Interview Questions & Answers https://msbiskills.com/sql-server-interview-questions/

My SQL Groups on Facebook:

1. If you like this post, you may want to join my SQL SERVER Interview Puzzles/Interview Questions on Facebook: https://www.facebook.com/groups/1430882120556342/

2. If you like this post, you may want to join my SQL Server Puzzles on Facebook:
https://www.facebook.com/groups/206594023090781/

My SQL Page on Facebook:

2. For all the updates you may follow my page -> https://www.facebook.com/MSBISkillscom-1602779883299222/

Enjoy !!! Keep Learning

Http://MsbiSkills.com

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