Understanding Endpoint in SQL Server Mirroring

When correctly configured, SQL Server Mirroring or the mirroring system allows the high accessibility of the database. However, while studying in deep various other factors are also related to it, which are essential to be measured before implementing the practice of mirroring as a solution to the condition. The number of factors includes server environment, workload intensity, bandwidth consumption by the network, etc.

Removal of the feature in the future releases of the SQL Server was decided beforehand. Therefore, it is suggested not to deploy the practice in later versions and plan accordingly to modify the applications that are continuing the practice of this feature.

TIP: By using AlwaysOn Availability Group is recommended over selecting mirroring services.
For the participation in groups or database of AlwaysOn Availability server instance needs its own, devoted database mirroring endpoint.

This endpoint is for the special-purpose endpoint, which is utilized completely for receiving connections from instances of other servers. Mainly, every single connection with any AlwaysOn Availability Groups as well as database mirroring instance utilizes database mirroring of the single endpoint.

Database mirroring endpoints utilizes TCP (Transmission Control Protocol) to send/receive messages in between the instances of the server that are taking part in the sessions of database mirroring as well as replicas of hosting availability. Al the mirroring of database endpoint attends on distinctive TCP port number.

Server Network Address

The network address of server instance encloses the port number of its endpoint, system, and the domain name of the host machine. The port number id identified exceptionally a precise server instance.

For e.g. The addresses of network server instances, enclose the similar system name, MYCOMPUTER, and domain name, works.domain.com. To permit the machine for routing the connections to a server instance, server network address contains port number connected with the endpoint of mirroring of a specific server instance. However, by default, SQL Server instance does not comprise endpoint of mirroring database.

These must be manually generated as part of database setting up mirroring session. The system admin must generate a distinct endpoint in the separate instance of the server, which is to join in database mirroring.

Finding Authentication Type for Database

It is significant to know, which accounts of SQL Server instances decide what type of verification you can utilize for the endpoints of database mirroring as mentioned:

  • If all instance of the server is running under service account domain then, you can utilize Windows Authentication for the mirroring database endpoints. If all instances of server run as similar user account of the domain, the accurate user logins exist automatically in master databases. This simplifies the configuration of security for the availability of the database.
  • If any server instances, which are hosting replicas of availability for availability group run as altered accounts, the login individual account, which must be made in master on the server instance. Then, that login must have permissions of CONNECT for connecting with the endpoint of database mirroring of the server instance.
  • If server instances utilize Windows Authentication then, you can generate endpoints of database mirroring by utilizing PowerShell, T-SQL, or New Availability Group Wizard.
  • If any instance of the server is running under built-in accounts like Local Service, Local System, or Network Service, or non-domain account then, you must utilize endpoint authentication for certificates. If you are spending certificates for your database mirroring endpoints, your machine administrator must configure every server instance to utilize certificates on both outbound as well as inbound connections.


It is important to understand the whole concept while setting up the Endpoint in SQL Server mirroring database. It is important for users to understand every point in an efficient manner. We have covered all the points and is one of the most well-known as well as implemented way it has not only been recommended by experts but also taken into deliberation by most administrators.

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