ByDr. SubraMANI Paramasivam

FREE Technical Data Seminar in London

Hi Everyone. I am very excited to announce the DAGEOP’s first FREE DATA SEMINAR programme now available for you to attend and enjoy the sessions from world renowned speakers. Please visit this link to get yourself registered and I have 3 sessions frozen already and awaiting for the final one. I will get back to you with final agenda once that is confirmed.

You can find more information on this from

Also provided you the agenda that is available as of now. Don’t forget to register as this seating is limited.



ByHariharan Rajendran

Stretch in SQL Server RC0

SQL Server Release Candidate 0 version has been released. We have been discussed about stretch database in CTP 3.3. There are many improvements in RC0. This article is about, how to enable the stretch in RC0.


Go through Stretch in SQL Server 2016 CTP 3.3.

Steps to enable the Stretch in RC0 Version,

Step 1:  Right click on your database and go to Tasks->Stretch->Enable



Step 2: Choose the tables you want to stretch.


Step 3: Provide your Azure subscription to configure SQL Server and database for stretch.


Step 4: Set up master key for your database.


Step 5: Provide your IP, in case if you have configured.



Step 6: Configuration process started to enable stretch for database and table.



As you can see, there are some difference in steps to configure when compare with CTP 3.3 version. There is no changes on Monitoring the stretch.

Enable Stretch for Tables

Previously, we need to select Reconfigure option to add new tables to stretch but that “Reconfigure” option has been removed. Now, we have “Enable”, “Disable” & “Monitor”.

To add new tables to stretch, follow the below steps.

Choose the new table to add into stretch. Right click –> Stretch –>Enable






Disable Stretch

To Disable the stretch for the database, we need to disable the stretch for tables first. We don’t have option to disable in one short if multiple tables are in stretch. Need to manually disable all the tables from stretch.

If we try to disable stretch for database without disabling tables then below message will be appeared.


There are two options in disable on table,

1. Bring data back from Azure

2. Leave data in Azure.

Once stretch is enabled for a table, data migration will be initiated from local to azure through batch process. If we decided to disable the stretch then make sure whether we want to bring data back to local or keep them on azure it self. Based on  that choose any of the above option.

Note: The table in Azure database will not be deleted by process, you need to delete it by going to azure management portal.

If you are selected “Bring data back from Azure” then below message will be prompted.


Once disable the stretch for all your tables, then disable the stretch on your database.


ByHariharan Rajendran

Issues in R Package in SQL Server 2016

I have got a below error when I try to use one of the R package “ggplot2”.


It says that there is no package called ggplot2 even though I installed the ggplot2 package in R.

Message from R when I install ggplot2 package,


The above message clearly explaining that the package is not installed on defined path, it has been downloaded on temporary directory. It means there was no proper installation happened in R. This was the reason for error in SQL Server.

Follow the below steps to sort out the issue,

Use “.libPaths” to define the library path before install a package in R.

Command is,

> .libPaths (.libPaths()[2:3])

> install.packages(“ggplot2”)

Package will be installed like below,


Now run the same SQL Script with R, this time it will be executed without an issue.

ByDr. SubraMANI Paramasivam

Data Driven & SQL Server 2016

Following today’s Data Driven live streaming from New York, Satya Nadella have opened the speech by providing insights on what CEOs and organization owners should see with Data being the key factor driving the business.




Also SQL Server 2016 RC (Release Candidate) is now available here and no more CTPs from Microsoft download site. Be the first to download the latest Release Candidate and try the brand new features of SQL Server.



ByHariharan Rajendran

Monitor Stretch in SQL Server 2016

Go through my previous article to enable the stretch for your database and table. This article is about how to monitor the stretch. You can monitor the stretch through GUI or DMVs.

We have below DMVs available to monitor the status of the stretch.

select * from sys.remote_data_archive_databases


The above script will provide the details about what is the database name in Azure used for stretch.



select * from sys.remote_data_archive_tables


This will tell you, what is the table name in azure used for stretch.


The above result has column called “filter_predicate”. It means, if apply any predicate function while configure the stretch then you can see that predicate function here. unfortunately, we don’t have option to apply the predicate function in GUI method. It is available when we enable stretch through T-SQL Script.

select * from sys.dm_db_rda_migration_status

This script will tell you about data migration. Data will start migrate from the table once stretch is enabled. Migration will start  from on-premises SQL Server to Azure. It is using batch process so it will migrate maximum of  4999 records in a batch. The batch id will be available in Azure table.


To see the live migration, we can use “SP_SPACEUSED”. By seeing the rows and size we can identify the data migration.



You can monitor the stretch using GUI,



ByHariharan Rajendran

Enable Stretch Database in SQL Server 2016

We can enable the stretch feature either through GUI or T-SQL Script. This article will talk about GUI method.

To enable the stretch for your database,

1. You should have Azure subscription

2. If you are using existing SQL Server in Azure then firewall should be enabled.

Steps to enable the stretch,

Step 1: Choose your database which you need to enable stretch and right click –> Tasks –>Stretch –>Enable


Step 2:  Create a database credentials, you need to provide the master key. you should use this key whenever you disable or enable the stretch for this database.


Step 3: Select the table which you want to do stretch, you can select multiple tables. This screen will give the information  about your table and records in that table and also it will tell you that whether stretch is already enabled or not (Stretched = False).


Step 4: SQL Server settings will be validated here.


Step 5: You need to sign in using your credentials where azure subscription is active. Once sign in, then you need to select Azure SQL Server. You can create a new server or select from existing server.



Step 6: Provide your Azure SQL Server credentials.


Step 7: Finally , SQL Server will configure stretch for your database and table. To verify, check your database icon.






If you get an error while configuring stretch like below, then check the log file. Mostly you will get an error when you are not configured the firewall in Azure SQL Server.


Log file,


ByHariharan Rajendran

[Step by Step] Azure SQL Database Linked Server

As we are familiar with the known concept “Linked Server”. This article is about, how to create a linked server for Azure SQL database.

Make sure the firewall is enabled in Azure SQL Server.

Step 1: Go to SQL Server Management Studio

Step 2: Run the below scripts. This script using a stored procedure “SP_addlinkedserver”.

EXEC sp_addlinkedserver

@server=‘Azure’, –Provide Linked Server Name



@datasrc=‘tcp:<servername>,1433’, –provide Azure SQl Server name



@catalog=‘SQLDB1’ –Provide azure database name


Step 3: Run the below script to provide the SQL Server login for the above created linked server.

exec sp_addlinkedsrvlogin ‘Azure’, ‘FALSE’, NULL, ‘<azure sql server login>’, ‘<sql server password>’;


Step 4: Verify the created linked server.



Step 5: Access the azure SQL database table. You need to use 4 part query. <linked server name>.<database name>.<schema name>.<table name>



ByHariharan Rajendran

In Memory Table in SQL Server

In a normal database, we can not create a in-memory tables. To create a in-memory table, we need to follow the below rules.

1. Create or Alter database to add a memory optimized data file group

2. Add a file into the file group.

Steps to alter your database to support in-memory tables. Before that let us try to create in-memory table in normal database.


Step 1: Alter the database to add memory optimized file group.



Step 2: Add a file into the file group. Try to provide the path where SQL Server is installed.

ALTER DATABASE [SampleDB] ADD FILE (name=‘Analytics_Mode’,filename=‘E:\Local_Install_Applications\SQL Server\MSSQL13.MSSQLSERVER\MSSQL\DATA\InMemory1’) TO FILEGROUP Analytics_Mode


In the above script “InMemeory1” is a directory, don’t create this directory manually. The above script will create automatically and will populate the files.

Step 3: Now run the in-memory table script.



    AccountDescription nvarchar (50),

    AccountType nvarchar(50),

    Unit int