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Another of the special cases comes into play with large numbers of tables where large means at least seven. As it works through possible join orders, the optimizer simply ignores, and doesn t even list, any that would require too many Cartesian joins (other than single-row Cartesian joins). The parameter _optimizer_search_limit seems to be the parameter that controls the limit on the number of Cartesian joins allowed, and has a default value of 5. Of course, it is instructive to see what happens if you give Oracle a query that joins seven tables, with no scope for anything other than Cartesian joins all the way. There is a lot more to investigate in the 10053 trace in particular the information it gives you with more complex SQL statements that require the optimizer to evaluate subplans for several transformations of your query, and then consider various optional execution mechanisms such as star joins. And I haven t even mentioned what goes on when you use the first_rows(N) optimization hint. But I have to leave something for volumes 2 and 3.

NOTE: Not all third-party icons (applications) you added to your old BlackBerry will be able to be copied to your new BlackBerry. The Curve will have a newer operating system and may have a different screen size, so some third-party apps that worked on your old BlackBerry will not work on the Curve.

[Serializable] public enum class WaterEnum { Moist, Medium, Dry }; [ Serializable] public ref class Plant { // an internal counter to determine instance IDs static int counter;

hen you upgrade from one version of Oracle to another, or even from one patch release to the next, there are bound to be some areas of your code where things just go wrong. The optimizer is a prime target for this kind of issue. New features that improve 99% of all known queries may cripple your database because you fall into the remaining 1% of special cases. This appendix is just a brief summary of features of the optimizer that may cause problems because implementation details have changed across versions 8i, 9i, and 10g. Every feature (and the possible problem it may introduce) is described in greater detail in the body of the book. The purpose of pulling all the changes into one appendix is to give you a quick reference point should you hit a strange performance problem on an upgrade.

1. 2. 3. Connect both your Palm/Windows Mobile handheld and your new BlackBerry to your computer at the same time.. Click the Start button to see Figure 2-6. Follow the on-screen directions.

Selectivity and cardinality are very closely related the selectivity represents that fraction of rows that will be selected from a set, and the cardinality represents the number of rows that will be extracted. As a general rule, then, you can say cardinality = number of rows out = selectivity * number of rows in. In this appendix, I have referenced only the selectivity when commenting on the effects of upgrades on the optimizer. This is simply to reduce the number of times I would have to repeat phrases like, And when the selectivity changes, the cardinality changes, hence ...

NOTE: Because the devices use different operating systems, not all the information from the Palm or Windows Mobile device will be copied to your BlackBerry.

// The instance ID keeps track of the plant objects. It will be // a different ID when the object is deserialized, so this does not need // to be serialized. We use the NonSerialized attribute to indicate that. [NonSerialized] int InstanceID; public: property property property property property property property

It s worth emphasizing that I believe that (almost all of) the changes listed in this appendix are generally good ideas. But any change in the optimizer may be sufficient to make a piece of SQL choose a different execution path, and sometimes the change in path will have an unfortunate impact on performance. Fortunately, there are many features that can be disabled by setting an associated hidden parameter as indicated in Appendix B by the list of parameters controlled by the master parameter optimizer_features_enable.

If you haven t yet moved from using the analyze command to using the dbms_stats package, you are going to have to one day. When that day comes, make sure you test carefully, as there are three issues that you have to face.

NOTE: You will not be able to copy any icons or software from your Palm/Windows Mobile device to your BlackBerry. If you have a favorite application from Palm/Windows Mobile, check out the BlackBerry App World (see page 441) or the software vendor s web site to see if there is a compatible version for your BlackBerry Curve.