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In the face of the popularity of instant messaging software, similar software that has been used on the Internet for years known as Internet Relay Chat (IRC) is enjoying a resurgence IRC clients support long-term communication on specific subjects by creating specific channels associated with those topics Channel names are prefixed by a hash mark For example, you can find information about an IRC channel dedicated to discussing GCC development at http://gccgnuorg/wiki/ GCConIRC As with the GCC wiki, this is not a general location where you can ask general usage questions those should still be posted on the appropriate GCC mailing lists Given the popularity of GCC, there are a number of other sites that provide relevant and useful information about GCC and compiler technology in general.

The more data pages your query needs to retrieve, the slower the query..

The Web is a transient environment for information, but the resources listed in this section have been around for a while and will (hopefully) still be available if you ever need to consult them One of my favorite general sites is The Compilers Resources Page (http://wwwbloodshednet/compilers/) This page is a general resource for a variety of compilers, including GCC It lists all known free compilers and provides a mechanism where you can add others to the list if you are aware of one that is missing It also provides links to a number of compiler construction toolkits, articles, and tutorials on compiler technology, and links to other compiler-related sites Though this Web site is an excellent general resource for compilers and compiler technology, the only GCC-specific information available on this page is a link to the GCC home page and links to several Windows-based ports of GCC.

Appropriate indexing In addition to watching for fragmentation, you need to make sure only useful indexes are kept on your tables Your table indexes should be based on your high priority or frequently executed queries If a query is executing thousands of times a day and is completing in two seconds, but could be running in less than one second with the proper index, adding this index could reduce the I/O pressure on your SQL Server instance significantly You should create indexes as needed, and remove indexes that aren t being used (this chapter shows you how to do this) Each index on your table adds overhead to data modification operations, and can even slow down SELECT queries if SQL Server decides to use the less efficient index.

If you apply a few tinting options like you did in 5, you get the set of samples shown in Figure 6-19.

Given that the Web is virtually infinite in size and scope, hundreds of other sites are available that provide information about building, using, and solving problems with GCC A few seconds with your favorite search engine should result in enough links for a few days of browsing..

When you re initially designing your database, it is better for you to keep the indexes at a minimum (having at least a clustered index and nonclustered indexes for your foreign keys) Instead, wait to add additional indexes until after you have a better idea about the queries that will be executed against the database Up-to-date statistics As I discussed in 22, the AUTO_CREATE_STATISTICS database option enables SQL Server to automatically generate statistical information regarding the distribution of values in a column If you disable this behavior, statistics can get out of date Since SQL Server depends on statistics to decide how to execute the query, SQL Server may choose a less than optimal plan if it is basing its execution decisions on stale statistics In this chapter, I ll demonstrate the commands and techniques you can use to help troubleshoot and evaluate your query performance.

You ll also learn how to address fragmented indexes and out-ofdate statistics, and evaluate the usage of indexes in the database I ll introduce you to a few graphical interface tools such as SQL Server Profiler, graphical execution plans, and the Database Engine Tuning Advisor This chapter will also review a few miscellaneous performance topics, including how to use sp_executesql as an alternative to dynamic SQL, how to apply query hints to a query without changing the query itself, and how to force a query to use a specific query execution plan..