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Use RC4 for minimal encryption strength and best performance. Use AES if you require strong encryption, but note that this algorithm requires more calculation overhead and affects performance.
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Database Mirroring endpoints include a third argument related to the role within the Database Mirroring session.
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You can specify only one TCP endpoint with a payload of DATABASE_MIRRORING for each instance of SQL Server.
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You can specify that an endpoint be a PARTNER, WITNESS, or ALL. An endpoint specified as PARTNER can participate only as the principal or the mirror. An endpoint specified as WITNESS can participate only as a witness. An endpoint specified as ALL can function in any role.
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NOTE
Endpoints on Express Edition
If you create a Database Mirroring endpoint on SQL Server 2005 Express Edition, it supports only a role of WITNESS.
The following Transact-SQL example shows how to create a Database Mirroring endpoint:
CREATE ENDPOINT [Mirroring]
AS TCP (LISTENER_PORT = 5022)
FOR DATA_MIRRORING (ROLE = PARTNER, ENCRYPTION = REQUIRED);
ALTER ENDPOINT [Mirroring] STATE = STARTED;
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.
Service Broker Specific Arguments
In addition to authentication modes and encryption, Service Broker endpoints imple ment arguments related to message forwarding. The MESSAGE_FORWARDING option enables messages destined for a different bro ker instance to be forwarded to a specified forwarding address. The options are ENABLED and DISABLED. If the MESSAGE_FORWARDING option is set to ENABLED, you can also specify the MESSAGE_FORWARDING_SIZE, which speci fies the maximum amount of storage to allocate for forwarded messages. Although a complete discussion of Service Broker is beyond the scope of this discus sion, a short overview is necessary to explain this behavior. Service Broker instances process messages by executing stored procedures to perform work in an asynchro nous manner. Each Broker instance is configured to process messages of a particular format. However, it is possible to have many Broker instances configured in an envi ronment, each of which processes a different type of message. By employing message forwarding, administrators can more easily balance the load on Broker instances with out requiring changes to applications.
Lesson 2: TCP Endpoints
NOTE
Encryption
The communication encryption for endpoints is coded to understand the source and destination of the traffic. If the communication will occur entirely within the SQL Server instance, the traffic is not encrypted because it would introduce unnecessary overhead in the communications. This is espe cially important with Service Broker, in which many messages are exchanged between queues within a single instance. Traffic is encrypted only when data will be transmitted outside of the SQL Server instance.
Quick Check
1. What types of authentication are available for Service Broker and Database Mirroring endpoints 2. What are the two universal arguments for TCP endpoints
Quick Check Answers
1. NTML or Kerberos authentications can be specified. You can also specify an option of NEGOTIATE, which causes the specific authentication method to be negotiated between the application and the endpoint. 2. You are required to specify a port for the endpoint to listen on. You can optionally configure an IP address that restricts the endpoint to respond to traffic coming only from the specified IP address. There is no practice for this lesson. You have already inspected the TCP endpoints that were created by default in the previous exercise. In 9, Database Mirror ing, you will create TCP endpoints with a payload of DATABASE_MIRRORING.
Lesson Summary
TSQL endpoints are configured during installation to listen on the port number specified for the instance. Service Broker and Database Mirroring endpoints can have an authentication method specified as well as enabled for encrypting all traffic sent based on an algorithm that you specify.
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