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The operator tells the relationship how to compare the two query items In nearly all cases, as in our simple example of product numbers in the product and order details query subjects, the link should be made when the value of the query items are the same; thus the default equals operator (=) will be correct You will rarely need to change it However, in some situations, you may need a different operator For instance, you might need a link where the condition says that a date query item in a record in one query subject matches all of the records in another query subject with a date query item that has an earlier date In this case, you would change the operator to less than (<) Sometimes you need a compound link to establish the correct relationship For instance, in an enterprise resource planning (ERP) system that covers multiple organizations, the condition on which you join the query subjects might be where both the product number and the organization code match In this case, you would have one link match the product numbers, and you would need to add another link to accommodate the organization code To do so, click the New Link button between the Query Subject areas This will add a link, for which you can set the query items Note that the query items and the operator can be set only for one link at a time The selected link appears as a bold, blue line To select and work with a different link, just click the link (the line) and then you will be able to modify it As you add or change links, you will notice the expression at the bottom of the dialog changing You could edit the expression directly by clicking the ellipsis button to the right of the expression, but most everything you need to do to create a set of valid links can be done by adding links, changing operators, or adding calculations to the query subject before establishing the relationship We recommend doing that rather than editing the expression if at all possible.

1 Import the namespace This identifies the set of classes that you'll be using within your application to interact with the database Developers import the namespace so that they don't have to write the fully qualified class name, which is much longer than if the namespace is imported 2 Create an instance of the connection class Remember from 2 that a class definition describes a class much as a stencil describes a letter of the alphabet You create a real object described by the class by creating an instance of the class This is similar to using the stencil to create a real letter of the alphabet

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The cardinality setting tells the model what to expect in terms of matching records from the two query subjects A cardinality setting is associated with each side of the relationship Cardinality can be expressed as one of the following: 11 01 One and only one record from this side of the relationship Zero or at most one record from this side of the relationship 1n One or more records from this side of the relationship 0n Zero or more records from this side of the relationship Let s look at the 11 and 1n settings first In relational database terminology, we often refer to one-to-one and many-to-one relationships In a one-to-one relationship, each record in one table has one and only one matching record in the other That is modeled with a cardinality of 11 on both sides of the relationship More prevalent are many-to-one relationships, in which many records in one table refer to the same record in the other table Sometimes these are referred to equivalently as one-tomany relationships; it is just a matter of which side you are mentioning first Our simple example of the order details relating to the product information is such an example Many order detail records refer to the same product because we sell the same product many times To model this relationship, you will need to set 11 on the one side, like the product, and 1n on the many side, like the order details

This method supports migration from any Oracle database version on any platform It requires downtime, which for the most part depends on the time it takes to move the data through the network CTAS and IAS methods are single threaded and are not automatically parallelized since the database link is inherently serial when used in a statement However, you can manually parallelize the migration process by initiating multiple CTAS or IAS statements But keep in mind that the overall throughput is limited by the available network bandwidth between the source and the destination This method enables migration of subsets of data, including subsets of schemas and even portions of tables or partitions by using the QUERY clause Consider routing the database links over the InfiniBand or the 10 Gigabit Ethernet network to improve the data transfer rate

Part IV:

3 Open the connection You do this by calling an appropriate instance function of the instance of the class

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