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I first came across this example of a constraint on one table becoming a predicate on another while I was preparing a presentation on dynamic sampling. Once the parameter optimizer_dynamic_sampling is set to 4 or more, then the optimizer will request a sample of any table with two or more single-table predicates against it before generating the full execution plan. When I was first testing the effects of dynamic sampling, I wrote a query with two tables, each having just one single-table predicate and Oracle surprised me by sampling one of the tables. Transitive closure had added two extra predicates to one of the tables. Oracle is often like that when you re busy looking at one feature, another feature sneaks in to confuse the issue.

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Assemblies can also consist of more than one file. The manifest for an assembly may actually be a separate file. The manifest actually contains information that specifies all the files that make up an assembly. Since this is an introductory text, it won t cover how to create and work with multifile assemblies.

You can expect the mechanism to become increasingly sophisticated as time passes. The two examples shown previously demonstrated cases where there was a simple constraint on a single column for a slightly more sophisticated example, look at constraint_03.sql in the online code suite, which is an example of Oracle using a table-level constraint of the form check (n2 >= n1) to create a constraint that allows a query to change its execution plan from a tablescan to an indexed access path.

This chapter shows you how to install the new BlackBerry Desktop Manager Software on your Apple Mac computer and complete the basics of synchronizing your contacts, calendar, tasks, memos, and backup and restore. If you want to transfer files and media with your Mac, see the chapter on transferring files for Mac users (see page 141).You may need some of the instructions in this chapter on how to install Desktop Manager if you want to use it as your method to transfer files. CAUTION: Do you use more than one computer (e.g. work, home, etc.) If so, check the Sync with other computers option if you plan on syncing your BlackBerry with multiple computers using Desktop Manager. Otherwise, you could end up corrupting your BlackBerry and/or computer databases. Do you want a wireless, two-way automated sync Try using Google Contacts, Google Calendar, and Google Sync for your BlackBerry. All of these are free apps and give you a full two-way wireless sync.

Summary

For years, Windows users have enjoyed the seamless Synchronization of their contacts, calendar, notes, and tasks with their PC via the BlackBerry Desktop Manager Software. Now, for the first time, this peace of mind that comes with knowing your data is fully backed up and available to the Mac user. If you are a Windows user, this will seem familiar yet very much streamlined for the Mac. If you have never used BlackBerry Desktop Manager, you will be able to not only synchronize your data, but backup, restore, sync your iTunes playlists, and more.

Summary

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.

Desktop Manager for Mac software was is available for free at BlackBerry.com. To download it, use the following steps: