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Don t cover everything: Although SQL Server allows you to cover every column in a query, that doesn t mean you should. Just because you increase the performance of one query does not mean you will not impact the other queries that write to that table. Don t over index: Remember, all the data for the key values that you choose will be stored in the nonclustered index as well as in the table. Every time the table is inserted, updated, or deleted, every nonclustered index whose key columns are modified will be impacted. Be careful not to over index a table such that performance is impacted. Review the Post-Index Creation section for more information on determining the cost of writes to indexes. Uniqueness: Try to create nonclustered indexes on key columns where the cardinality or selectivity is high. The query optimizer will be more likely to use those nonclustered indexes instead of doing a table scan. JOIN clauses: Pay attention to columns listed in JOIN clauses. Parent/child joins are common. Parent tables are typically accessed through their primary keys, which often correspond to their clustered indexes. What is often overlooked, though, are the foreign key values in the child tables. Consider indexing those using nonclustered indexes. For example, you might create a nonclustered index on the order_number column in a line_items table. Nonclustered indexes will be utilized frequently within your application and can provide significant performance improvements. Just keep in mind that adding nonclustered indexes incorrectly could potentially cause performance problems. So plan your indexes before implementation.

Use a semitransparent color. Any color that has an alpha value less than 255 is semitransparent. You can use a semitransparent color when setting the foreground, background, or border of an element. Set the OpacityMask property. This allows you to make specific regions of an element transparent or partially transparent. For example, you can use it to fade a shape gradually into transparency. Figure 8-5 shows an example that uses the first two approaches to create transparent elements.

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Finally, we will actually create some indexes. The syntax for index creation is fairly straightforward. The following script shows the create index syntax: CREATE [CLUSTERED | NONCLUSTERED] INDEX index_name ON <object>(column [ASC | DESC], [,...]) [INCLUDE ( column_name [,...n]) [WITH (relational_index_options [,...n]) The preceding code shows you how to build composite indexes, which are indexes with multiple columns. You can also see the syntax for specifying the relational index options that you want to use. Let s go ahead and use the syntax in some examples. The first two examples create a clustered and nonclustered index with the default option values: USE AdventureWorks2008 GO CREATE CLUSTERED INDEX ix_bookId ON apWriter.Books(bookId) CREATE NONCLUSTERED INDEX ix_Title ON apWriter.Books(Title)

Figure 8-5. A page with several semitransparent elements In this example, the top-level layout container is a Grid that uses an ImageBrush that sets a picture for the background. The opacity of the StackPanel is reduced to 70%, allowing the solid color underneath to show through. (In this case, it s simply a white background, which lightens the image.) <Grid Margin="5" Opacity="0.7"> <Grid.Background> <ImageBrush ImageSource="celestial.jpg" /> </Grid.Background> ... </Grid>

Listing 11 5. Store List Item <li> <a class="noeffect" href="#"> <span class="image" style="background-image: url(/public/img.jpg)"></span> <span class="comment">This is a Comment</span> <span class="name">Cell Title</span> <span class="stars4"></span> <span class="starcomment">100 Ratings</span> <span class="arrow"></span> <span class="price">$1.99</span> </a> </li>

The first element inside is a button, which uses a partially transparent red background color (set through the Foreground property). The image shows through in the button background, but the text is opaque. (Had the Opacity property been set, both the foreground and background would have become semitransparent.) <Button Foreground="Green" Background="#60AA4030" FontSize="16" Margin="10" Padding="20" Content="A Semi-Transparent Button"></Button>

As you create more indexes, you should take advantage of relational index options When you create an index, you can specify the following: ALLOW_ROW_LOCKS: Allows the Database Engine to use row locks if it deems them necessary ALLOW_PAGE_LOCKS: Allows the Database Engine to use page locks if necessary DATA_COMPRESSION: Identifies the type of compression you want used for the clustered and nonclustered indexes The available options are as follows: NONE (indicating that you don t want the data compressed), ROW (to compress data row by row), and PAGE (to compress entire pages at a time) DROP_EXISTING: Allows the dropping of a named index prior to rebuilding the index The index names must be identical, even though you can change the definition of the index We have mixed feelings about using this option.

Note Silverlight supports the ARGB color standard, which uses four values to describe every color. These

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