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Second, performance drawbacks to using the transaction processing abilities of a MySQL (or any other) database server have turned off some would-be experimenters in favor of the less-secure, but much more palatable, world of non-transaction-safe databases We will examine some of the performance impacts of transaction processing in this chapter Armed with the knowledge of how transaction processing truly benefits certain application environments, you ll be able to make an informed decision about whether to implement transaction-safe features of MySQL in your own applications Lastly, as we ve mentioned, MySQL has a unique implementation of transaction processing that relies on the InnoDB storage engine Although InnoDB has been around since version 323, it is still not the default storage engine for MySQL (MyISAM is), and due to this, many developers have not implemented transaction processing in their applications.

It s a less suitable approach if you need to perform the same type of validation for the same control in different windows, because you ll probably need to copy the code into multiple form-level event handlers Neither approach is automatically better than the other it all depends on how complex your code is, and how you want to reuse it..

The next step of the wizard shows the list of tables contained in the data source. Tick the tables that you wish to import. You can choose to import data along with the schema by ticking the check box in the Import Data column, which is shown in Figure 14-32.

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Microsoft originally planned to make MS Help 2, the Help engine that debuted in Visual Studio .NET 2002, the next Help revolution (see Figure 22-4). Help 2 promised some long-awaited improvements to HTML Help, like a redesigned user interface, and the ability to embed a Help window in an application interface with minimum fuss. However, it also had its idiosyncrasies. For example, every Help 2 file must be registered with the Windows operating system. You can t simply copy the appropriate .HxS file to another computer.

At the end of this chapter, we ll discuss the ramifications of having InnoDB fulfill transaction-processing requirements, as opposed to taking a storage-engine agnostic approach, and advise you how to determine the level of transaction processing you require As you may have guessed by the title, we ll be covering a broad range of topics in this chapter, all related to transaction processing Our goal is to address the concepts of transaction processing, in a database-agnostic fashion However, at certain points in the chapter, we ll discuss how MySQL handles particular aspects of transaction processing This should give you the foundation from which you can evaluate InnoDB s implementation of transaction processing within MySQL, which we ll cover in detail in 5.

Figure 14-32. Selecting the list of tables you wish to import The next window in the wizard (shown in Figure 14-33) shows a description of the columns in each table. This allows you to modify the table schema before it is created in Oracle. The changes done here will only affect the table in the target database, not the source database.

Figure 22-4. Help 2.0: an aborted standard Sadly, the release of the Help 2 standard was postponed in December 2001, and ultimately canceled in January 2003. Instead, Microsoft is perfecting a new standard that will debut with the next version of Windows, called Windows Vista. The key issue with Help 2 is the lack of integration with the operating system. However, it s still widely used by third parties to distribute .NET developer documentation (as all .NET developers have the Help 2 engine installed, either through Visual Studio or the .NET SDK). To find out more information about Help 2, refer to the excellent community site http://helpware.net. You can also find a variety of tools for registering and compiling Help 2 collections.

In this chapter, we ll cover these fundamental concepts regarding transaction processing: Transaction processing basics, including what constitutes a transaction and the components of the ACID test (the de-facto standard for judging a transaction processing system) How transaction processing systems ensure atomicity, consistency, and durability three closely related ACID properties How transaction processing systems implement isolation (the other ACID property) through concurrency Guidelines for identifying your own transaction processing requirements do you really need this stuff.

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