Solution Guide for Migrating Oracle on UNIX to SQL Server - Willy .Net

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46Planning PhaseWhile creating the logical design, the team takes into account all the business, user,operational and system requirements that state the need <strong>for</strong> security, auditing, logging,scalability, state management, error handling, licensing, globalization, applicationarchitecture, integration with other systems, and so on.There are several ways to represent the logical design of a system. A commonly usedvisual modeling language is Unified Modeling Language (UML). A detailed discussion ofUML is out of the scope of this solution. For more in<strong>for</strong>mation on UML, refer to TheUnified Modeling Language User <strong>Guide</strong> (Booch, Jacobson, and Rumbaugh 1999) andUse Case Driven Object Modeling with UML: A Practical Approach (Rosenberg and Scott1999).Figure 3.1 shows a sample logical design <strong>for</strong> a system using the Logical Object Model, asdefined by UML. The sample design represents the system in terms of:● Objects. These are people or things in the system. "Order" is an example of anobject in Figure 3.1.● Services. These are the behavior or functionality associated with any object. Forexample, "Track Status()" is a service provided by the "Order" object in Figure 3.1.● Attributes. These are characteristics or properties of the objects. For example,"Order ID" and "Ship Date" are attributes of the "Order" object in Figure 3.1● Relationships. These represent ways in which objects are linked with each other.For example, the object Order and the object Order line item are shown to have anassociative relationship in Figure 3.1 by a thick line. This shows that they arerelated and a change to one affects the other.The objects, services, attributes and relationships can be obtained from the detailedusage scenarios that were developed in the conceptual design phase.The logical design represents a logical view of the complete system. Individual teams,such as those <strong>for</strong> User Interface (UI) development, the database development, and theapplication development can take this representation and start to build the detaileddesigns <strong>for</strong> their domain when making the physical design.
<strong>Solution</strong> <strong>Guide</strong> <strong>for</strong> <strong>Migrating</strong> <strong>Oracle</strong> on UNIX to SQL Server on Windows 47Figure 3.1Creating a logical design <strong>for</strong> the applicationLogical Design ConsiderationsThe logical design <strong>for</strong> an <strong>Oracle</strong> database migration project must take into account thechanges that will occur as a result of migration from <strong>Oracle</strong> to SQL Server. The followingitems should be considered:● Are there any dependencies between client applications and databaseconnectivity?● Do UNIX scripts support the client applications?● How are communications between the application and database secured internallyand over the internet?● How is data distributed across multiple databases and multiple servers?
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332 AppendicesOracle</stron
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362 AppendicesAppendix E: Reference
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Solution Guide for Migrating Oracle on UNIX to SQL Server - Willy .Net

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