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Note the appearance of the line view of vw_sq_1 in the execution plan This is an indication that the optimizer has done some query unnesting Alternative names for views you can get as a result of unnesting are vw_nsq_1 and vw_nso_1 (with a change in the numeric bit for complicated SQL that manages to produce more than one unnesting action) Those of you who have read Oracle Performance Tuning 101 by Gaja Vaidyanatha et al (Osborne McGraw-Hill, 2001) will recall at this point that one of the authors suggestions for dealing with certain types of subquery was to convert the subquery into an inline view and put it into the body of the query This was such a good idea that the optimizer now does it automatically It happens more or less inevitably in 9i, but is a cost-based decision in 10g.

Figure 3-7. Media Sync screen (Music tab).

The test case produces exactly the same final plan for 10g as it does for 9i, including the cardinality of 1,000 rather than the 167 that 10g produced when doing a filter (so the cardinality is still wrong with its bind variable 5%, but it is closer) However, when you look at the 10053 trace, you find that 9i has produced just two general plans sections, whereas 10g has produced ten sections before producing a final course of action, suggesting that the decision to unnest was driven by the cost The first section in the 9i trace generated the strategy for instantiating the inline aggregate view, and the second section worked out how to join the aggregate view to the other table.

NOTE: At the top of Figure 3-7, you see a BlackBerry 9700 model with a 2GB media card; you will not see this on your computer; instead, you will see the name and model number of your BlackBerry as well as the size of your media card. Make sure to click on the Music tab in the upper left corner as shown in Figure 3-7 to configure your music sync. TIP: To get back to the Configure Settings screen we just completed, just click the Options button in the upper right corner of Figure 3-7 and click on the Device tab at the top (see Figure 3-5).

You will want to separate your code into different dynamically linked libraries. Let s look at how to use types from one assembly in another in the simplest possible example. Compile the code in Listing 3-4 using the /LD option to generate a DLL. This DLL is a CLR assembly just as was the executable created in a previous section. Listing 3-4. A Trivial Public Class // file1.cpp public ref class R { }; As mentioned, we must add the keyword public at the class level to make this type visible in another assembly (see Listing 3-5). Listing 3-5. Using Our Trivial Class from Another Assembly // file2.cpp #using "file1.dll" // We'll define a function, so we can see it in the metadata later. void F() { R r; } int main() {} Without the keyword public, the type R will not be visible to the code in file2.cpp. Compile file2.cpp with the usual options for managed code (just /clr or /clr:pure will do) to generate an executable assembly file2.exe.

The trace file for 10g started with the same two sections, and then seemed to have a section calculating the effect of joining the two tables before doing an aggregation (which I thought should have been blocked by the no_merge hint), followed by various repetitions of very similar calculations Lurking within the later calculations were two sections relating to costing the query using the old 8i filter option which was more expensive than the unnesting option, and therefore ignored (although in a secondary experiment, I changed the data so that the filter was cheaper than the unnest, and the filter was chosen automatically)..

To import your Album Art, just click the Import Album Art link next to the Sync Music button in the lower right corner of Figure 3-3. If you are importing from iTunes, iTunes will automatically start automatically (Figure 3-8). NOTE: If iTunes has a dialog box open when it automatically starts, you will have to close out the dialog box and re-try the Import Album Art button.

versions of 10.1. Do not try using it as a hint on a production system until it is documented for public use.