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It is common for Oracle users to process data using third-party tools, since Oracle SQL has traditionally lacked sophisticated modeling capabilities to produce complex reports A basic example is the use of spreadsheets, which apply formulas to transform data into new forms In previous versions of Oracle, in order to produce these spreadsheet-like reports, you needed to either download data into spreadsheet programs like Microsoft Excel or use dedicated multidimensional online analytical processing (OLAP) servers such as Oracle Express For example, you might use Excel to convert your business data into rule-based business models, with the help of various macros But third-party spreadsheet tools are cumbersome to use, and you need to expend considerable effort and time to constantly import updated Oracle data into the spreadsheet programs Oracle professionals commonly make heavy use of multiple table joins and unions when dealing with complex data warehousing data.

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These techniques help you perform very complex computations, but they are usually slow and computationally expensive Oracle Database 10g offers the extremely powerful MODEL clause, which allows you to use SQL statements to categorize data and apply sophisticated formulas to produce fancy reports directly from within the database itself You can now produce highly useful Oracle analytical queries, overcoming several drawbacks of Oracle SQL With the new MODEL clause, you can use normal SQL statements to create multidimensional arrays and conduct complex interrow and interarray calculations on the array cells The MODEL clause provides interrow calculation functionality by enabling you to create multidimensional arrays of your query data and letting you randomly access the cells within the arrays The way the MODEL clause addresses individual cells is called symbolic cell addressing The MODEL clause also performs symbolic array computation, by transforming the individual cells using formulas, which it calls rules.

The MODEL clause enables you to apply business models to your existing data When you use the MODEL clause as part of a query, Oracle feeds the data retrieved by the query to the MODEL clause The MODEL clause rearranges the data into a multidimensional array and applies your business rules to the individual elements of the array From the application of various user-specified business rules, Oracle derives updated as well as newly created data However, you won t actually see an array as your final form of the output, since Oracle will format the new and updated data into a row format when it delivers the MODEL clause s output to you The first step in a MODEL-based query is the creation of the multidimensional array The following section explains the basis of the arrays created by the MODEL clause..

The MODEL clause creates the multidimensional arrays that are at the heart of its functionality by mapping all the columns of the query that contains a MODEL clause into the following three groups. Partitions: Basically, a partition is a result handed to the MODEL clause by previous grouping operations. The MODEL clause is always separately applied to the data within each partition. Dimensions: A dimension is a layer of metadata you can apply to a table to define hierarchical relationships among the table s columns. For example, a dimension named REGION could contain the hierarchy of STATE, COUNTY, and CITY. You may define several dimensions on a table, such as region, time, and product.

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The second asynchronous exception that is important for reliable resource management is System::StackOverflowException. The managed stack in the CLR is heavily based on the native stack. Elements pushed on the managed stack exist either on the native stack or in processor registers. A System::StackOverflowException occurs as a result of a native stack overflow exception, which is a Win32 SEH exception with the exception code EXCEPTION_STACK_OVERFLOW (=0xC00000FD). A stack overflow exception can be very difficult to handle properly because the lack of stack space does not leave many options for reacting. Calling a function implies pushing all parameters and the return address on the stack that has just run out of space. After a stack overflow, such an operation will likely fail. In the resource allocation code shown following, a stack overflow could in fact occur after the native function is called, but before the property setter for the handle property finishes its work: XYZConnection() { try {} finally { xyzHandle.Handle = ::XYZConnect(); } }