Skip to main content

How to configure your Availability Group listener to ASP.NET

SQL Server’s availability group Always On feature is great to have features for your Database. Anytime one of your database nodes goes down, your secondary replica will automatically take over. After a failover, your secondary cluster node becomes the primary cluster. Now the question arises, “Do I need to configure my APP server connectionstring each time I face a failover cluster?”. The answer is NO, you don’t have to configure your app server connectionstring every time.


Default ConnectionString

By default, your App server connectionstring looks something like this – 

<connectionStrings>
    <add name="ConnStringDb1" connectionString="Data
Source=localhost;Initial Catalog=YourDataBaseName;Integrated
Security=True;" providerName="System.Data.SqlClient" />
  </connectionStrings>

ConnectionString for Failover Partner

You can manually specify the failover partner in your connectionstring like this

<connectionStrings>
    <add name="ConnStringDb1" connectionString="Data
Source=myServerAddress;Failover Partner=myMirrorServerAddress;Initial
Catalog=YourDataBaseName;Integrated Security=True;" providerName="System.Data.SqlClient"/>
  </connectionStrings>

 Here you need to specify your primary node in “Data Source” and your Failover secondary node in Failover Partner.

ConnectionString for AG (Availability Group)

With AG (Availability Group) properly set up, you can simply do this – 

<connectionStrings>
    <add name="ConnStringDb1" connectionString="Server=tcp:MyAgListener,1433;Database=Db1;IntegratedSecurity=SSPI;
MultiSubnetFailover=True" providerName="System.Data.SqlClient" />
  </connectionStrings>

 Here you need to specify your Availability group listener in “Server” field and take some vacation perhaps. Your App Server is going to manage the failover on its own.

 

Labels:

Comments

Post a Comment

Most Loved Posts

Threadpool - A deadly poison wait for SQL Server (The What, When and How)

Introduction  Threadpool is a  poison  wait. Yes, I mean it. Its poison for SQL Server, its poison for the Business and of course, the end-users! The most devastating thing about threadpool is you hardly recognize it because it comes in disguise, meaning you see no memory or cpu pressure in the system, yet you cannot run any query, it seems like your SQL Server is frozen solid. That scary, isn't it?
2 comments
Read more

SQL Schema Compare with Visual Studio (A complete Guide)

Introduction When you're working on your Dev Database, an urgent issue comes along, and you instantly solve it by changing Scheme in the Staging Database or Production Database :3, few more these type of patching and you're completely out of sync! A lot of paid alternatives are there like SQL Data Compare by RedGate, but my first choice is Visual Studio's SQL Data Tools. In the following article, I tried to image-describe the steps for SQL Data Tool. Like I said before, there are lots of handly DBAtools out there to compare Schema between two DB Sources. I would like to discuss how you can compare two SQL Server DB with Visual Studio. Make sure you have SQL Server Data tools checked while installing Visual Studio.
Post a Comment
Read more

How to Backup SQL server like Batman: The Ultimate SQL DBA Guide

Post a Comment
Read more

Slow SQL Server : What we should NOT do

 Try to list the best practices of SQL Server. It will require a heck of a time. Try to list the Bad Practices and it will require more than the best practice list , of course, probably you’ll end up getting frustrated . (seeing all the oops configurations and its effect on SQL Server )
Post a Comment
Read more

Intelligent Query Processing in SQL Server 2019 Big Data

SQL Server 2019: Intelligent Query Processing SQL Server 2019 ships with some brand-new features. Many of these features are targeted for Big Data Solutions. No wonder in that, since the world is moving faster towards Big Data and it is absolutely necessary to cope up with that. Today we will discuss one such feature called Approximate Query Processing. Approximate Query Processing SQL Server ships with Intelligent Query Processing out of the box with SQL Server 2019 installation. Approximate Query processing is a part of Intelligent Query Processing. Things we will be covering in this article – Understand the need for Approximation with Case Study Case Study 1: Railway Case Study 2: e-commerce How to use Approximate Query Processing Demo Code for Comparing Performance Results Limitations When to avoid Approximate Query Processing Understand the need for Approximate Query Processing Before using any technological feature, we must understand why we should use it? Should we jus...
Post a Comment
Read more

Maxdop and Cost theshold for parallelism SQL Server

 Maxdop  Maxdop stands for max degree for parallelism.  Let's say, the maxdop is set to 4, it means during parallel plan execution, SQL server is going to use 4 processors. If you set your Maxdop settings to 0, it means SQL server is going to use as many processors it needs to complete your request. 
Post a Comment
Read more

How to generate C# Class from SQL Server Table

C# Class from SQL Database Table There are multiple ways you can generate a C# class from your Database Table. We will be covering the following topics in today’s article. Generate Class with foreign key relation Generate Class with only entities Generate Class with foreign key relations For this we can simply use Entity Frameworks EDMX update feature which will generate our C# class from Database Tables. The output from EDMX will contain foreign key relations which we can see from the virtual interfaces like this -  public partial class AssetItem { [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors")] public AssetItem() { this .AssetItemDepreciations = new HashSet<AssetItemDepreciation>(); this .AssetTaxMappings = new HashSet<AssetTaxMapping>(); this .AssetVatMappings = new HashSet<AssetVatMapping>(); ...
Post a Comment
Read more

6 Letters for SQL Disaster Emergencies : RPO and RTO

 
Post a Comment
Read more

How to encrypt an entire excel file using AES-128 encryption

What Is AES? AES stands for Advanced Encryption Standard. It is a symmetric block cipher that is used by the U.S. government to protect classified information. AES is used worldwide to protect classified data around the world. AES is essential in cybersecurity, electronic data protection, and computer security. Variations of AES AES is used in three block cipher versions namely AES 128, AES 192, AES 256. AES 128 uses 128-bit key length to encrypt and decrypt block messages. This is a symmetric secret key which means it uses same secret key for encrypting and decrypting message blocks. AES Encryption of Excel File Today we will AES 128 to encrypt an Excel File. The excel file looks like the following image. To encrypt this excel file, we will use C#. First, we need to create a console project. Let's name the project ExcelEncryption. First, we try to understand what we need to achieve. We need a KEY and Initialization Vector (IV) pair for AES 128 encryption. Let’s say, th...
Post a Comment
Read more