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In a real-world migration scenario, the flat file extracts from the source system tend to be the bottleneck and not the network throughput or the data loads The bottleneck is mainly due to the performance limitation of the source database storage system, the CPU limitation on the source platform, or writes to the temporary staging location It is not easy to estimate the time it takes for the initial data load, since multiple components exist in the path of the data and each component will have different throughput It is important to remember that the overall data transfer throughput is limited by the slowest link in the data flow The best way to estimate data transfer times is to measure the actual performance of a test run on the subset of data, under similar network connectivity like it would be in production The initial data migration process will push large amounts of data over the network connecting the source and the destination systems, and in order to get the best possible throughput, it is important to factor in the network throughput The best throughput possible is on the Database Machine side using the InfiniBand network Refer to 4 for the different mechanisms available to connect the Database Machine to the outside world The best practice for extracting data from the source database is to utilize the data dump utilities that come bundled with the source database software installation These utilities are the most efficient and supported methods to pull data out of the source system The loads into Oracle should be performed using the best practices of data loading such as the external table load Initial loads can be performed by using custom extract and load scripts, and by using automated tools such as Oracle Data Integrator, Oracle GoldenGate, or Oracle SQL Developer We will discuss these products and their capabilities in detail in a later section.

This procedure invokes the COM-based Microsoft XML Core Services Library (MSXML) to convert your textual XML data to an internal XML Document Object Model (XML DOM) representation sp_xml_preparedocument allocates memory for the XML DOM representation of your XML and returns an integer identifier, known as a document handle Once you ve created the XML DOM representation of your XML data, you can call the OPENXML function to shred it OPENXML takes three parameters: the document handle you generated previously with the call to sp_xml_preparedocument, an XPath-style path expression to indicate the nodes to shred, and an optional integer flag value that determines whether the input XML is element-centric or attribute-centric The OPENXML function WITH clause allows you to specify the structure of the output rowset.

Suppose you change the voltage source, connected across the coil, from dc to ac (Fig 13-3) Imagine that you can vary the frequency of the ac, from a few hertz to hundreds of hertz, then kilohertz, then megahertz At first, the current will be high, just as it is with dc But the coil has a certain amount of inductance, and it takes some time for current to establish itself in the coil Depending on how many turns there are and on whether the core is air or a ferromagnetic material, you ll reach a point, as the ac frequency increases, when the coil starts to get sluggish That is, the current won t have time to get established in the coil before the polarity of the ac voltage reverses At high ac frequencies, the current through the coil will have difficulty following the voltage placed across the coil This sluggishness in a coil for ac is, in effect, similar to dc resistance As the frequency is raised, the effect gets more pronounced Eventually, if you keep increasing the frequency of the ac source, the coil will not even come near establishing a current with each cycle Then the coil will act like a high resistance The opposition that the coil offers to ac is called inductive reactance It, like resistance, is measured in ohms It can vary, just as resistance does, from near zero (a short piece of wire) to a few ohms (a small coil) to kilohms or megohms (bigger and bigger coils) Like resistance, inductive reactance affects the current in an ac circuit But, unlike simple resistance, reactance changes with frequency This effect is not merely a decrease in the current, although in practice this does happen Inductive reactance produces a change in the way the current flows with respect to the voltage.

Each column of the rowset can be defined with a column name, T-SQL data type, and a path expression indicating where the data should be pulled from relative to the current context node..