Implementing Database Mirroring in Visual Studio .NET

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Implementing Database Mirroring
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This code creates an endpoint to service database mirroring sessions on port 5022, responding to requests from all valid IP addresses. The ROLE = PARTNER option specifies that the endpoint allows only databases hosted on this SQL Server instance to participate as a principal or mirror using the RC4 encryption algorithm.
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Configuring database mirroring
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You typically configure database mirroring within SQL Server Management Studio (SSMS) from the Database Properties, Mirroring page. On this page, you click Configure Security, which launches the Configure Database Mirroring Security Wizard that lets you specify several options. For example, you can use this wizard to specify whether you plan to use a witness server instance in your mirroring configuration. When you re finished with your selections, the wizard executes the two commands shown in the preceding example CREATE ENDPOINT and ALTER ENDPOINT against each instance hosting a database that participates in a database mirroring session.
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What are the seven levels of security provided by TCP endpoints servicing database mirroring sessions The first layer is the type and payload definition. Layer two defines the TCP options of the port number and Listener IP. Layer three is the authentication method required for the endpoint. Layer four adds encryption options for all communications between partners. Layer five requires that the account authenticating the connection have CONNECT permissions. Layer six specifies STATE options that determine whether the endpoint will allow or respond to connection requests. Layer seven in the endpoint security model restricts the database mirroring roles that an endpoint supports.
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Establishing Endpoints for Database Mirroring
In this practice, you establish the endpoints required for a database mirroring session. You configure endpoints for a principal, a witness, and a mirror to allow the creation of a database mirroring session using any operating mode.
Lesson 3: Establishing Endpoints
1. Connect to the instance hosting the AdventureWorks database that you plan to use as the principal database. 2. Right-click the AdventureWorks database and choose Properties. 3. Select the Mirroring page. 4. Click Configure Security to launch the Configure Database Mirroring Security Wizard. 5. On the first screen, the splash screen, select the Do Not Show This Starting Page Again check box. Click Next. You will now define endpoints for all three database mirroring roles: principal, mirror, and witness. 6. On the Include Witness Server page, verify that Yes is selected. This option enables you to configure an endpoint s security for the witness server instance. Click Next. 7. On the Choose Servers To Configure page, you see that the Principal Server check box is selected and unavailable because it is assumed that you are running the wizard from that instance. Verify that the Mirror Server Instance and Witness Server Instance check boxes are also selected. Click Next. 8. On the Principal Server Instance page, by default, the Principal Server instance is already selected. In the Listener Port text box, specify a port number. In the Endpoint Name text box, type a name for the endpoint. Also verify that the Encrypt Data Sent Through This Endpoint check box is selected to ensure secured communications. Click Next.
NOTE
Retrieving endpoint information
If an endpoint for database mirroring has already been created for the instance, SQL Server will retrieve this information and display it in this screen; you cannot edit this information.
9. On the Mirror Server Instance page, click Connect, specify the instance name and login credentials for the instance on which you want to host the mirror database, and then click Connect. This creates a connection to the instance hosting the mirror. Specify the port number and a name for the endpoint, and select the Encrypt Data Sent Through This Endpoint check box to ensure secure communications. Click Next.
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