How to find the process id for all running instance in the Sql Server.

From this post you can learn how to find the process id for all running instance in the sql server.

--Running connections

DECLARE @SPWHO2 TABLE

(

SPID VARCHAR(1000),

[Status] VARCHAR(1000) NULL,

[Login] VARCHAR(1000) NULL,

HostName VARCHAR(1000) NULL,

BlkBy VARCHAR(1000) NULL,

DBName VARCHAR(1000) NULL,

Command VARCHAR(1000) NULL,

CPUTime VARCHAR(1000) NULL,

DiskIO VARCHAR(1000) NULL,

LastBatch VARCHAR(1000) NULL,

ProgramName VARCHAR(1000) NULL,

SPID2 VARCHAR(1000) NULL,

Request VARCHAR(1000) NULL

)

INSERT INTO @SPWHO2

EXEC sp_who2

SELECT * FROM @SPWHO2

when you run the above query you will get the process id for all running instance. we are using here sp_who2 and collect that data in a dynamic table. 

In this post you can learn how to find the process id for all running instance in the sql server.

How to find the script for the running process in the sql server.

In this post we are going to see how to find the script for the running process in sql server.

Replace the spid with the process id of the instance, how to get the spid click this link

DECLARE @sqltext VARBINARY(128)

SELECT @sqltext = sql_handle

FROM sys.sysprocesses

WHERE spid = 1         

SELECT TEXT

FROM sys.dm_exec_sql_text(@sqltext)

GO

From this post you are going to learn how to find the script for the running process in sql server.

How to find a Active Sql Connections

Hi In this post we are going to see how to find the active sql connections are there in server, sometimes the connection pool will get full and returns us a error like connection timeout. to find which are there for active connections.

select

    db_name(dbid) as [DbName],

    count(dbid) as [NoOfConnections],

    loginame as [LoginName]

from sys.sysprocesses

where  dbid > 0

group by

 dbid, loginame

From this post you can learn how to find the active sql connections.

Sql server Normalization

What is Normalization ?
  Normalization is a process of eliminating Redundant data and storing the related information in a table.


1. Eliminating Redundant data.
2. Faster update
3. Improve performance
4. Performance in indexes

Let we see different Normalization forms

1. First Normal Form (1NF)
    If a Table is said to be 1NF then it should satisfy following rules.

• Each cell must have one value
• Eliminating Duplicate Columns
• Create a separate table for group of related data and each row must be identify by primary key.

That means each cell must have single value and each row should be uniquely identified by Primary key

For Example :

Name	Department	Phone Number
Rajesh	Computer	3452342,1234563,2345612
Suresh	Electronics	2398521,2323177,5302994
Praba	Civil	3958218

In the above we can see the duplicate columns phone numbers have more than one value , we have to eliminate that and create a group of related data with Unique row identification by specifying a primary key for the table

Rule 1. By applying above rule each cell must have one value above table changes like below

Name	Department	Phone Number	Phone Number	Phone Number
Rajesh	Computer	3452342	1234563	2345612
Suresh	Electronics	2398521	2323177	5302994
Praba	Civil	3958218

Rule 2 & 3 . By applying second rule and third rule no more duplicate columns and each row must be unique is applied     to above table.

Id	Name	Department	Phone Number
1	Rajesh	Computer	3452342
2	Rajesh	Computer	1234563
3	Rajesh	Computer	2345612
4	Suresh	Electronics	2398521
5	Suresh	Electronics	2323177
6	Suresh	Electronics	5302994
7	Praba	Civil	3958218

2. Second Normal Form (2NF)

    The Table must be in second normal form , Then it should satisfy the following rules.

•  It should satisfy first normal form
•  Separate the particular columns ,values are duplicated in each row  should be place in separate table
•  Create the relationship between the tables

From the above table we can see the column name and department are repeated in each row ,This two columns can be maintained in another table and make a relationship between these two tables 

EmpId	Name	Department
1	Rajesh	Computer
2	Suresh	Electronics
3	Praba	Civil

Id	EmpId	PhoneNumber
1	1	3452342
2	1	1234563
3	1	2345612
4	2	2398521
5	2	2323177
6	2	5302994
7	3	3958218

In the above table Empid is played as Primary key for the first table and foreign key for the second table.

3. Third Normal Form (3NF)

     The table must be in 3NF,if it is satisfying the following rules

•  Must be in 2NF
•  Separate the columns that are not dependent upon the primary key of the table.

Product	Price	Tax
LED	23000	20%
AC	15000	10%
Fridge	12000	15%

From the above table you can see that Tax Column is not dependent on Product Primary key column, It is dependent on Price so we separate that in to two different table.

Product	Price
LED	23000
AC	15000
Fridge	12000

Price	Tax
23000	20%
15000	10%
12000	15%

4. Fourth Normal Form (4NF)

• It should be in 3NF
• The non key columns should be dependent on full primary key instead of partial key , If then separate it.

From the following table "EmployeeName" Non-Key column not dependent on full primary key "ManagerId,EmployeeId,TaskID" it depends upon the EmployeeId  Partial Key so it can be separated.

ManagerId	EmployeeId	TaskID	EmployeeName
M1	E1	T1	Rajesh
M2	E1	T1	Rajesh

ManagerId	EmployeeId	TaskID
M1	E1	T1
M2	E1	T1

EmployeeId	EmployeeName
E1	Rajesh

That's it from this article we can see the normalization and there concepts Fully.