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After implementing the data store part of the data model, we can now focus on the operational part of the logical model. We mentioned three data management operations that will be supported by our solution: entity creation, entity modification, and entity retrieval. Regarding their relationship to the data flow, we can divide the supported data management operations into two groups: Inbound operations Govern the flow of data into the database. Create and Update are both inbound operations; Outbound operations Govern the flow of data out of the database. Read is the outbound operation. With inbound operations, our objective should be clear. We ll have to Extract the data from the XML source. Insert the data into the data store that doesn t yet exist there. Update data that already exists in the data store to reflect the data extracted from the source. With outbound operations, the objective is to Read the data from the database and return it in XML format.

Oracle GoldenGate can replicate data between two Oracle Databases running on different versions and platforms This feature allows you to migrate and upgrade a prior version of Oracle Database on any platform to the Database Machine and keep the databases in sync for a time, and then perform a switchover once the destination is ready to go live The benefits of using Oracle GoldenGate for migration are

Before we begin coding, we must consider all the relevant facts about the XML sources used in our solution. Both XML Schemas allow the XML to contain more than one entity. The related entities are nested in the source, which reflects the relationships between them. Not only must we extract the entities from the XML source, but we also have to do this in the correct order. How do we determine the correct order By reviewing the physical model, shown in figure 1, the dependency of individual sets of data can be observed (follow the arrows and identify where they all point to). When importing the data into the database, we should start with the independent entities and finish with dependent ones. This is a valid order of inbound operations for the Album XML Schema:

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This method provides zero-downtime migrations The only impact is for the applications to initiate a reconnection to the Oracle Database on the Database Machine

Title (doesn t depend on any other entity) Album (depends on Title) Track (depends on Title and Album) Person (doesn t depend on any other entity) Track Author (depends on Person and Track) Band (doesn t depend on any other Entity) Track Performer (depends on Band and Track)

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This is a valid order of inbound operations for the Band XML Schema:

1 2 3

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There are no restrictions on the source platform or the database versions The source needs to be 101 or later, on any platform Even non-Oracle sources are supported with GoldenGate The initial instantiation of the database on the Database Machine will happen while the source database is online and with minimal impact There is no performance impact on the source database, since GoldenGate asynchronously mines the redo logs for capturing changes from the source

Band (doesn t depend on any other entity) Person (doesn t depend on any other entity) Band Member (depends on Person and Band)