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Regular indexes work the best if the corresponding columns contain many different values, resulting in better selectivity. Unique indexes offer the best selectivity, because they contain only different values. This means that every equality search (... WHERE COL = ...) results in at most one row. At the other side of the spectrum, if a column contains only a few values (typical examples are gender, status, and yes/no columns), a regular index is not very useful, because the average selectivity of equality searches will be poor. For such low-cardinality columns, the Oracle DBMS supports bitmap indexes. Bitmap indexes may also outperform regular indexes if your WHERE clause is complicated, using many AND, OR, and NOT connectives. You create bitmap indexes by specifying the BITMAP option (see Figure 7-11).

Because Microsoft is both a product and a platforms company, it has a vast array of partners who have their own software engineers working to innovate on top of what Microsoft has shipped. Vendors and partners who work with Microsoft make the engineering force of Microsoft well more than 100,000 software engineers worldwide. Compared with the full ecosystem made up of millions of software engineers around the world working on Apple, IBM, Sun, Oracle, and open source software such as Linux, the Microsoft engineering force is a small percentage. Still, it is perhaps the most powerful and influential engineering force in the market today. Note There are more than 35,000 software engineers working full time for Microsoft in more than 40 countries around the world. Each year Microsoft hires more than 5,000 new software engineers and more than 1,000 new software design engineers in Test. Compared with most other companies, Microsoft is unique in both its engineering processes and its management of software engineers. Some might look at the company's success in the software industry and point to these unique differences as key competitive advantages. Others point to some of our products and their major slips and wonder if these differences are a weakness. So, what are the software engineering factors that make Microsoft unique and different from any other company in the world

If the only changes to the way ASP.NET developers handled data were the changes to ADO.NET, most ASP developers wouldn t be tremendously impressed. Fortunately, ASP.NET brings compelling changes to data handling that are visible in the context of ASP.NET forms. ASP.NET forms provide developers with additional assistance with oneway, read-only data binding. As with much of the magic offered by ASP.NET, server-side controls are at the heart of the data handling improvements. The Swiss army knife of Microsoft Visual Basic 6.0 developers is the data grid. A data grid is a component that displays data in a tabular form, with rows and columns of data, and looks somewhat like a spreadsheet. For better or worse, a data grid drives many Visual Basic 6.0 user interfaces. ASP.NET doesn t disappoint in maintaining this approach, providing a data grid that takes full advantage of the data binding in ASP.NET. While providing much of the functionality of a traditional data-bound grid, the ASP.NET data grid acts much like a Web interface, making it somewhat less convenient for the user but consistent with the relatively efficient use of bandwidth that Web applications are known for. In addition, there are other server controls that are somewhat less convenient to use but much more flexible. These controls allow the developer to create a template for the user interface and let the framework handle navigating the recordset. To fully understand the improvements involved with ASP.NET, let s first review how ASP handled access to data.

The following snippet shows the resulting transfer() method s implementation. Note that we assume that we soften the SQLExceptions thrown by commit(), rollback(), and close():

After you configure the block, as described in the previous sections of this chapter, you can write code in your application that uses the features of the block. However, first, you must add references to the appropriate Enterprise Library assemblies to your project. In addition to the Enterprise Library assemblies you require in every Enterprise Library project (listed in 1, Introduction ), you should reference or add to your bin folder the following assemblies: Microsoft.Practices.EnterpriseLibrary.Security.dll Microsoft.Practices.EnterpriseLibrary.Security.Cryptography.dll Microsoft.Practices.EnterpriseLibrary.Security.Cache.CachingStore.dll Microsoft.Practices.EnterpriseLibrary.Security.Caching.dll Microsoft.Practices.EnterpriseLibrary.Security.Caching.Cryptography.dll Microsoft.Practices.EnterpriseLibrary.Security.AzMan.dll You need the caching assemblies only if you are using a cache to store credentials. You need the AzMan assembly only if you are using the AzMan rule store.

Work directly with server-side control tags . Work with Web Forms and server-side controls using Microsoft Visual Studio . Work with postback events using Visual Studio . Understand the ASP .NET page rendering model .

size elements relative to the overall size of the form When you do need to provide a specific size for a control, use relative proportions to allow the entire form to be easily resized. You can achieve this by using style sheet expressions, as the following sample demonstrates.