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mysql> SHOW STATUS LIKE 'Table%'; +-----------------------+---------+ | Variable_name | Value | +-----------------------+---------+ | Table_locks_immediate | 1151552 | | Table_locks_waited | 15324 | +-----------------------+---------+ Table_locks_immediate is the number of times that a table lock was acquired immediately, and Table_locks_waited is the number of times a table lock could not be acquired immediately and a wait was needed. If the Table_locks_waited value is high, and you are having performance problems, you may want to split up large tables; for example, you might create a dedicated cache table for a custom module or consider ways to reduce the sizes or the frequency of the table lock commands. One way to reduce table sizes for some tables, such as the cache_*, watchdog, and accesslog tables, is by reducing the lifetime of the data. This can be done within the Drupal administrative interface. Also, making sure cron is being run as often as once an hour will keep these tables pruned. Because Drupal can be used in many different ways, it is impossible to give an across-the-board recommendation as to which tables should use which engine. However, in general, good candidates for conversion to InnoDB are the cache, watchdog, sessions, and accesslog tables. Fortunately, the conversion to InnoDB is very simple: ALTER TABLE accesslog TYPE='InnoDB'; Of course, this conversion should be done when the site is offline and your data has been backed up, and you should be informed about the different characteristics of InnoDB tables. For MySQL performance tuning, check out the performance tuning script at www.day32.com/MySQL/, which provides suggestions for tuning MySQL server variables.

.is()

Summary

Although changing data models can be painful in other programming environments, Core Data makes changing your data models nearly painless. With its support for model versions, lightweight migrations, and mapping models for migrations that aren t lightweight, you can change your data models with impunity and let Core Data make sure your users data stays intact. As with any part of your application, however, make sure you test your migrations. Test them extensively. Test them even more than you test your application code. Users can handle an occasional application crash, but if they upgrade to the latest version of your application and lose their data in the process, your application and reputation may never recover.

In this chapter, you learned the following: How to troubleshoot performance bottlenecks. How to optimize a web server. How to optimize a database. Drupal-specific optimizations. Possible multiserver architectures.

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The .is() method is a little different from other methods in that it does not return the jQuery object. It evaluates a result set without modifying it, which makes it ideal for use in callback functions or functions executed after the successful execution of a function or method. You ll learn more about practical uses of .is() in later examples of this book; right now, select all paragraphs in your test document then check if one has the class foo: $("p").is(".foo"); The result is a Boolean (true or false) answer: >>> $("p").is(".foo"); true

You can build a lot of cool apps without using the material in this chapter. Before you slam this book closed, however, we recommend you keep reading. This chapter contains material that addresses some advanced Core Data topics that your particular applications may require, especially if securing user data is important to your application. You caught a glimpse of one of the topics, using NSFetchedResultsController, with the League Manager application in 3. Follow along with this chapter to put some advanced Core Data tools in your tool box. In this chapter, we walk you through building an application that illustrates each of the topics we cover. You ll build the application incrementally and will be able to run the application at the end of each section so you can see that section s advanced feature working. Because each section builds on the previous ones, you shouldn t try to skip any sections. The application you build in this chapter, called MyStash, stores both passwords and notes. By the time you re done building it, the passwords are all safely encrypted. The notes, by default, aren t encrypted, but you can choose to encrypt individual notes. The passwords and notes live in separate databases, though they share the same data model. When you re done, you can make a few tweaks to the code, add an enticing icon, and who knows You may have an App Store hit on your hands!

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