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In this specific example, the option to open up the aggregate view and merge it into the rest of the query depends on the hidden parameter _complex_view_merging, which defaults to false in 8i, but defaults to true from 9i onwards. You can force 8i to do complex view merging by changing this parameter although you may find some cases where you also need to use the merge() hint to make merging happen. You could also stop 9i and 10g from doing complex view merging by changing the value of this parameter, but it might be more sensible to use the no_merge() hint selectively which is what I did to get the first of the two execution plans shown previously. There are many features available to the optimizer to manipulate your query before optimizing it predicate pushing, subquery unnesting, and star transformation (perhaps the most dramatic example of query transformation) have been around for a long time. Predicate generation through transitive closure has also been around years, and predicate generation from constraints has come and gone across the versions. All these possibilities (not to mention the explicit query rewrite feature), and perhaps some others that I haven t even noticed yet, make it much harder to determine precisely what is going on with complex SQL unless you examine the details very closely ultimately wading through a 10053 trace. Fortunately, though, you won t often need to get down to this extreme, as the detail offered by explain plan is often enough to tell you that a transformation has occurred. A couple of hints, or a check of the optimizer-related parameters, will usually tell you whether a transformation is mandatory or optional, costed or uncosted, and how much control you have over it.

Another useful program in your Media folder is the Voice Notes Recorder. Say you need to dictate something you need to remember at a later time. Or, perhaps you would rather speak a note instead of composing an email. Your BlackBerry makes that very easy for you.

There are occasions when the optimizer will decide that the optimum access path is to read the entire index in correct index order, starting with the leaf block at one end of the index and following the leaf pointers until it gets to the leaf block at the other end of the index.

This is a very simple program to use just click the trackpad when you are ready to record your note. Click it again when you are done.

A native function is said to have a native entry point, which is its address. Similarly, a managed function has a managed entry point. A function that may be called by both native and managed code has two separate entry points, one that is the actual function, and another that is a small compiler-generated function known as a thunk, which handles the context switch between native and managed code, and then calls the real function. You know that functions in Visual C++ have calling conventions specifying how parameters are handled by a function you looked at some earlier. The native calling conventions, such as __cdecl, __stdcall, and __thiscall, specify certain ways of passing parameters. Managed functions similarly have a calling convention, __clrcall, that characterizes the particulars about how managed functions are called. A function with the __clrcall calling convention only has a managed entry point. There is no native entry point generated for it. The calling convention for managed functions, and hence the set of entry points that get generated for a function, depends on the compilation mode. In pure mode and safe mode, __clrcall is the default for all managed functions. If you compile in safe mode or pure mode, a managed function will be generated with a managed entry point only, because in those modes, there is no native code that would require a native entry point. However, when you compile in mixed mode (/clr), as is likely in an interop scenario, both native and managed entry points are generated. This is because the calling convention is a native calling convention (__thiscall for methods and likely __cdecl for global functions, but this may be changed by a compiler option).

One of the options for the optimizer_mode in 8i was first_rows. This option still exists for backward compatibility in 9i and 10g, but is deprecated. One of the critical features of first_rows optimization (compared to the newer first_rows_N optimization) was the existence of a few rules for overriding the normal costing behavior. One such rule was that if there was an index that could be used to avoid a sort, then the optimizer would use it apparently regardless of how much more expensive the path might be. So a query that acquired five rows and sorted them under all_rows might switch to acquiring 1,000,000 rows, and discarding all but five of them under first_rows if this meant the sort could be avoided. So one side effect of first_rows optimization was the relatively frequent appearance of full scans of indexes. (In fact, you could change this behavior by adjusting the hidden parameter _sort_elimination_cost_ratio, as the default value made the behavior rather extreme.)

You will then see options along the lower part of the program that will allow you to: continue recording, stop, play, resume, delete, or e-mail the voice note. Just click on the corresponding icon to perform the desired action.