Microsoft SQL Server 2008 Administration for Oracle DBAs in Visual Studio .NET

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Microsoft SQL Server 2008 Administration for Oracle DBAs
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Figure 11-49 Replication management in SSMS
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11: Data Movement
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To use Oracle as a Publisher, Microsoft provides a script to run on the Oracle database that creates a user account and the relevant permissions on the schemas that you wish to publish (you can review the script before running) Oracle publication uses triggers and tracking tables in this new schema to track changes to the published tables Once the script has been run, the process can be completely managed from within SSMS Oracle will be available as a publisher so that you can publish tables as articles for your Subscribers At the Subscriber end of the solution, it is possible to have non SQL Server Subscribers The two supported non-Microsoft Subscriber types that are used are Oracle and DB2 Both of these platforms can be used to subscribe to snapshot and transactional publication types using a push subscription
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Q: If Oracle can be used as a Publisher, does this mean I can create SQL Server data marts using replication as the method of moving data from my Oracle-based data warehouse A: Yes, this is exactly the type of scenario where Oracle-to-SQL replication would be useful If your data marts each had a different focus, such as Sales or Marketing, you could create publications and articles that only publish the subsets of data that each mart requires for its reporting requirements
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Peer-to-peer replication is used to create scale-out solutions where all peers in the solution maintain their own copy of the database and propagate changes to each other as they occur In a peer-to-peer topology, each machine is in effect its own Publisher and Distributor, and at the same time is a Subscriber to all of its peers It is possible to have a remote central Distributor, but this is not recommended because it creates a single point of failure Peer-to-peer replication uses the transactional replication type to propagate transactions between each peer in the solution in near real time Take the example of a call center for a worldwide company The company operates on a global basis providing 24 7 support for its customers The company has three global call centers, located in New York, London, and Mumbai As one call center closes, the next call center comes online to continue providing service If a customer telephones the call center and logs a call with a Mumbai agent, the details of the call must be replicated
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Microsoft SQL Server 2008 Administration for Oracle DBAs
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to both London and New York so that at the end of Mumbai agent s shift, the call details are available to the agent in London to carry on working with the customer London can pass the call to New York and New York back to Mumbai In this scenario, if we were to use the standard hierarchical replication architecture with a single publisher and make all three call center Subscribers the challenge would be where does the Publisher reside In a peer-to-peer model everyone has a copy of the data and if one call center has a failure, two other call centers are available to take over Figure 11-50 represents the architecture Another purpose for which peer-to-peer replication can be used is load balancing Consider the scenario of the corporate website that takes orders from the Web and provides details on company products Instead of building one large server to handle all of the requests, it would be possible to put several servers in a peer-to-peer model and load-balance the web requests across each server Figure 11-51 shows an example of
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London
New York
Mumbai
Figure 11-50 Peer-to-peer replication model
11: Data Movement
The Internet
Network Load Balancer
Web Server Farm
Network Load Balancer
Peer-to-peer SQL Servers
Figure 11-51 Example of using SQL Server peer-to-peer architecture
a web farm taking requests from the Internet and then pushing the requests via a network load balancer to a farm of SQL Server instances This approach allows for scale-out of the solution and the ability to take servers down for planned maintenance It should be noted that peer-to-peer replication has limited conflict resolution, so when using peer-to-peer replication in a scale-out solution, it is recommended that the application guarantee that the same data is not modified on multiple nodes in short succession
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