Wednesday, January 28, 2015

Change SQL Server user login account password

Change SQL Server user login account password script:
Sometimes you need to change the password for a particular user in that case following script will help you to change the password.

in following Example :
Login account user name is : dbdevwebuser
Current password is : MyCurrentPwd
New password is : MyNewCurrentPwd

We can use following script to change the users login password.
ALTER LOGIN dbdevwebuser WITH PASSWORD = N'MyNewCurrentPwd' OLD_PASSWORD = 'MyCurrentPwd'
Happy Coding !! 

Friday, January 16, 2015

Reseeding/reset the identity of table.

Generally, on inserting the new data into table we get next seed value for identity column. When a row is deleted, we cannot use that identity value again. We can resolve it by reseeding the identity of table as follows:

1. SELECT * FROM Sample_Data

2. DELETE FROM Sample_Data WHERE Number > 4

SELECT @MaxID=MAX(Number) FROM Sample_Data


Checking identity information: current identity value '16'.
DBCC execution completed. If DBCC printed error messages, contact your system administrator.
4. INSERT INTO Sample_Data(Value) VALUES('Second')
   Go 3


Happy Coding!!

Monday, January 12, 2015

Find Most Expensive Queries Using DMV

Find Most Expensive Queries Using Dynamic Management Views(DMV)

When you try to find out the performance of an sql server, this query will help us.
It records how many times that execution plan get re-used by following execution. This will give us the count of the execution. It records the number of logical reads, logical writes, elapsed time etc. all this counter will help to find poor performer while monitoring SQL Server queries.
The query will use the Dynamic Management Views. DMV returns server state information that can be used to monitor the health of the server instance, diagnose problems and performance.
Following is the query which finds out top 10 most expensive queries

SELECT TOP 10 SUBSTRING(qt.TEXT, (qstat.statement_start_offset/2)+1,

  ((CASE qstat.statement_end_offset


  ELSE qstat.statement_end_offset

  END - qstat.statement_start_offset)/2)+1),


  qstat.total_logical_reads, qstat.last_logical_reads,

  qstat.total_logical_writes, qstat.last_logical_writes,



  qstat.total_elapsed_time/1000000 total_elapsed_time_in_S,

  qstat.last_elapsed_time/1000000 last_elapsed_time_in_S,



FROM sys.dm_exec_query_stats  qstat

CROSS APPLY sys.dm_exec_query_plan(qstat.plan_handle) qplan

CROSS APPLY sys.dm_exec_sql_text(qstat.sql_handle)  qt

ORDER BY qstat.total_logical_reads DESC -- logical reads

-- ORDER BY qstat.total_logical_writes DESC -- logical writes

-- ORDER BY qstat.total_worker_time DESC -- CPU time

Happy Coding !!

Monday, December 29, 2014

Sql Azure : Way Around for Sp_depends in Sql Azure

You can use following query to find out table used in Stored procedures similar to sp_depends.

Sp_depends helps us to provide information where sql object in referred in Views, stored procedure.
sp_depends is not available in sql azure but following query will provide similar functionality.
SELECT ReferencingObjectType = o1.type,
       ReferencingObject = SCHEMA_NAME(o1.schema_id)+'.',
       ReferencedObject = SCHEMA_NAME(o2.schema_id)+'.'+ed.referenced_entity_name,
       ReferencedObjectType = o2.type
FROM   sys.sql_expression_dependencies ed
       INNER JOIN  sys.objects o1
         ON ed.referencing_id = o1.object_id
       INNER JOIN sys.objects o2
         ON ed.referenced_id = o2.object_id
WHERE o1.type in ('P','TR','V', 'TF') and ed.referenced_entity_name like '<Table Name>'
ORDER BY ReferencingObjectType, ReferencingObject

replace <Table name>  with your actual table name which you want to search

Happy Coding !!

Steps to Create a customize Role for Azure database

Steps to Create a customize Role for Azure database
Download "Azure User Management Console" tool from

Create a Login
Use “Azure User Management Console”
EG: dbdevwebuser
Create User for login on master
Connect to master database, and execute the following:
CREATE USER dbdevwebuser FOR LOGIN dbdevwebuser WITH DEFAULT_SCHEMA=[dbo]

This has created user “dbdevwebuser” for the login “dbdevwebuser”.
Note: You can keep the login and the user name separate.

Create User for login on the database to be used by application
Connect to application database, and execute the following:
CREATE USER dbdevwebuser FOR LOGIN dbdevwebuser WITH DEFAULT_SCHEMA=[dbo]

Create Customized Role 
Connect to application database, and execute the following:
This will create a role by the name “db_executor”

Grant Permissions to Customized Role 
Here I am trying to create a role to grant execute for all stored procedure
GRANT EXECUTE TO [db_executor]

This will grant execute permission to the role “db_executor”
Note: You can “GRANT” more permission to this role, to make it more customized.

Assign Roles to User Created
Assign different roles of your choice to the user
sp_addrolemember @rolename = 'db_executor', @membername = 'dbdevwebuser'
sp_addrolemember @rolename = 'db_datareader', @membername = 'dbdevwebuser'
sp_addrolemember @rolename = 'db_datawriter', @membername = 'dbdevwebuser'

This will assign roles of “db_executor”, “db_datawrited” and “db_datareader” to the user 'dbdevwebuser' on the application database.
1. These kind of roles are usually used when you want your application to execute procedures, read and write data. But do not want them to manipulate any Schema.

Testing working of the User for the Roles Assigned

This user should
1. Execute procedure
2. Select, Insert, Update, Delete from the database
3. Create Temporary tables
4. Select View
This user should not:
1. Create, ALTER, Delete Table
2. Create, ALTER, Delete Procedure
3. Create, ALTER, Delete View
4. Create, ALTER, Delete Function
5. See Content “sp_helptext” for a Procedure

Happy Coding !!

How to make a database copy from production to staging server in Azure

On the same server

We need 1 user name with its password on staging database and production database. It is 1 time process only. If same user is not present in source and destination database then we can not create backup of database.
Note: It is required only if your Source and destination database is present on different server. If they are present in same server then you need to execute only following query with your respected values.

1.       Connect to destination server (Here Staging DB) “master” database with productions username and pwd  because we need to have same username with password on source and destination DB.

2.       Execute the following command:
b.      IMP: Replace the NEWDATABASENAME, SOURCE_SERVERNAME and SOURCEDATASE with correct names

To track progress you can run following command or you can connect to Azure portal and check the progress in database tab

3.       Execute: Select *  from sys.dm_database_copies, this will give you the stats of the % of database copied

hHappy Coding !!

How to rename a SQL Azure database?

1. Connect to your Database
2. Select Master Database
3. Type following Query

alter database <old-database-name> modify name = <new-database-name>

<old-database-name> is your old DB name
<new-database-name> is your new DB name
Note: Don't use single or double quotes around DB Name

alter database MyStudent modify name = StudentMaster

Your DB name is changed :)

Happy Coding !!