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After you download the various source files, create a build directory. On my system, I downloaded the source files into ~/src, which is the src subdirectory of my home directory, so I created a build directory named gcc-obj in this directory: $ cd ~/src $ mkdir gcc-obj Next, extract the tarballs: $ tar -jxf gcc-VERSION.bz2 $ tar -jxf gcc-testsuite-VERSION.bz2 $ cd gcc-VERSION

You can drop one or more indexes for a table using the DROP INDEX command. Dropping an index frees up the space taken up by the index and removes the index definition from the database. You can't use DROP INDEX to remove indexes that result from the creation of a PRIMARY KEY or UNIQUE CONSTRAINT. If you drop a clustered index that has nonclustered indexes on it, those nonclustered indexes will also be rebuilt in order to swap the clustered index key for a row identifier of the heap.

You can apply matrices to your images to produce image effects such as translations and shearing. To explain what is happening here, I ll briefly introduce some matrix manipulations on images. This is the identity matrix:

Unless you rename the resulting directories, the source distribution extracts into a directory named gcc-VERSION. I ll refer to this throughout this book as the source directory or the source tree in order to distinguish the source directory from the build tree, which is the directory in which you compile GCC. This distinction is important because I adhere to the recommendation of the GCC developers and do not build the compiler in the source directory. Why Keeping the source tree unpolluted by the detritus of a build makes it much easier to apply patches. A separate build directory also makes it trivial to delete an old or failed build simply delete the entire contents of the build tree. A configuration in which the source and build directories are the same is also not as well-tested. The build process creates directories on the fly, so building in a separate directory makes sure the build process does not clobber a preexisting directory. Finally, I take the developers at their word if they keep their source and build trees separate, I reckon it s prudent to follow their example.

In this recipe, I ll show you how to drop and recreate an index within a single execution, as well as change the key column definition of an existing index. The ALTER INDEX can be used to change index options, rebuild and reorganize indexes (reviewed in 23), and disable an index, but it is not used to actually add, delete, or rearrange columns in the index. You can, however, change the column definition of an existing index by using CREATE INDEX...DROP_EXISTING. This option also has the advantage of dropping and recreating an index within a single command (instead of using both DROP INDEX and CREATE INDEX). Also, using DROP_EXISTING on a clustered index will not cause existing nonclustered indexes to be automatically rebuilt, unless the index column definition has changed. This first example demonstrates just rebuilding an existing nonclustered index (no change in the column definition): CREATE NONCLUSTERED INDEX NCI_TerminationReason_DepartmentID ON HumanResources.TerminationReason (DepartmentID ASC) WITH (DROP_EXISTING = ON) GO Next, a new column is added to the existing nonclustered index: CREATE NONCLUSTERED INDEX NCI_TerminationReason_DepartmentID ON HumanResources.TerminationReason (ViolationSeverityLevel, DepartmentID DESC) WITH (DROP_EXISTING = ON) GO

In the first example, the CREATE INDEX didn t change anything about the existing index definition, but instead just rebuilds it by using the DROP_EXISTING clause. Rebuilding an index can help defragment the data, something which is discussed in more detail in 23. In the second statement, a new column was added to the existing index, and placed right before the DepartmentID. The index was recreated with the new index key column, making it a composite index. You can t use DROP_EXISTING to change the name of the index, however. For that, use DROP INDEX and CREATE INDEX with the new index name.

Do not use a build directory that is a subdirectory of the source tree. Doing so is entirely unsupported and will probably result in mysterious failures and problems.

So far in this chapter I ve reviewed how an index is defined, but note that you can also determine under what circumstances an index is built. For example, when creating an index in SQL Server 2005, in order to improve the performance, you can designate that a parallel plan of execution is used, instantiating multiple processors to help complete a time-consuming build. In addition to