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In this chapter, we ve looked at the difference between programming in classic C++ vs. managed code. We looked at Microsoft s Visual C++ 2005 and in particular the compilation modes available with Visual C++ 2005, including /clr:pure, /clr:safe, /clr:oldSyntax, /clr, and none of the above. We briefly discussed how to target 64-bit architectures with Visual C++ 2005. You also learned what an assembly is, looked at how to build one, examined what s in an assembly, saw how to reference other assemblies in a C++/CLI program, including how to control access to types in other assemblies, and briefly looked at the difference between the linker and the assembly linker. You also briefly saw some of what else there is to know about working with assemblies. There is much more that can be learned about assemblies in the CLR, but you now have enough for the purposes of working through the rest of this book. In the next chapter, you ll learn about objects and their semantics.

Summary

NOTE: If you have been using either Pocket Mac or The Missing Sync to synchronize your BlackBerry with your Mac, you will receive another warning note telling you that in order to proceed, the connection between your BlackBerry and the third-party synchronization software will need to be discontinued. 7. If you already have other software installed, you will see another warning message (see Figure 4-4). Click Install Anyway to move forward with the installation process.

There are good reasons why the optimizer can do some surprising things when calculating the cardinality If you know why things can go wrong, you have some chance of fixing these problems sensibly Critical points are as follows: the optimizer does not do very well with range scans on character strings If you get a highly skewed distribution on the first six or seven characters of a column, then the optimizer is likely to get a poor estimate of selectivity (and cardinality) quite frequently There is no quick and easy workaround to this, but a histogram with a lot of buckets can help Storing data in the wrong data type particularly storing dates in numeric or character columns, or turning sequence numbers into zero-padded character strings is likely to cause problems.

The installation process will begin (Figure 4-5). Follow the on-screen prompts as your Mac installs the new Desktop Manager Software.

The optimizer may get more accurate estimates of selectivity if you can create histograms with a sufficiently large number of buckets You may also be able to work around some problems by creating function-based indexes that restate the data in the correct type if you can also change the SQL to match Applications that use special values instead of nulls in columns are liable to produce poor execution plans if the columns are used in range-based predicates Again, a histogram on the critical column may make an enormous difference Applying functions to columns that do not participate in function-based indexes can lead to some unexpected selectivities You may even find that restating the same clause in a different way can lead to a significant change in selectivity because of some of the inconsistencies of the fixed constants used for the selectivity in these cases.

his chapter gets back into the language itself and covers how objects behave in C++/CLI. You ll learn a bit more about value types and reference types, including some of the implications of having a unified type system. You ll also see how to work with objects on the managed heap as though they were automatic variables, complete with the assurance that they will be cleaned up when they go out of scope. You ll look at tracking references and object dereferencing and copying. You ll also explore the various methods of passing parameters in C++/CLI and look at how to use C++/CLI types as return values.

Click Read License to read the software license or click Agree to proceed (Figure 4-6).

Transitive closure can create and lose predicates for you, and generally the impact will be good Occasionally, the side effects can be catastrophic, sometimes they may simply be surprising Although people sometimes insist on avoiding referential integrity constraints on data warehouses because of the overheads, remember that constraints may help the optimizer find a better execution plan And don t be surprised when Oracle picks up a constraint, turns it into a predicate, and then migrates it through transitive closure to a different table..

10. For most Mac users, one drive will be shown. It is possible that you may have more than one possible location for the install. Choose the correct drive and click Continue (Figure 4-7).