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ndexes assist with query processing by speeding up access to the data stored in tables and views. Indexes allow for ordered access to data based on an ordering of data rows. These rows are ordered based upon the values stored in certain columns. These columns comprise the index key columns and their values (for any given row) are a row s index key. This chapter contains recipes for creating, altering, and dropping different types of indexes. SQL Server 2005 has introduced several new changes to how indexes can be created, including a new syntax for index options, support for partition schemes, the INCLUDE command, page and row lock disabling, index disabling, and the ability to perform online operations. For exercises performed in this chapter, you may wish to back up the AdventureWorks database beforehand, so that you can restore it to its original state after going through the recipes.

If you already have a configure.ac file, the autoscan.log file will contain detailed messages about any advanced macros autoscan believes are required by your application but are not present in the configure.ac file. If you do not already have a configure.ac file or there are no apparent configuration problems, the autoscan.log file produced by a run of autoscan will be empty.

For coverage of index maintenance, re-indexing, and rebuilding (ALTER INDEX), see 23. Indexed views are covered in 7. For coverage of index performance troubleshooting and fragmentation, see 31.

An index is a database object that, when created on a table, can provide faster access paths to data and can facilitate faster query execution Indexes are used to provide SQL Server with a more efficient method of accessing the data Instead of always searching every data page in a table, an index facilitates retrieving specific rows without having to read a table s entire content By default, rows in a regular un-indexed table aren t stored in any particular order A table in an order-less state is called a heap In order to retrieve rows from a heap based on a matching set of search conditions, SQL Server would have to read through all the rows in the table.

If you do not have a configure.ac file and are using autoscan to generate a template, the autoscan program will exit with an error code of 1, but will still create the template configure.scan file.

Even if only one row matched the search criteria and that row just happened to be the first row the SQL Server database engine read, SQL Server would still need to evaluate every single table row, since there is no other way for it to know if other matching rows exist Such a scan for information is known as a full table scan For a large table, that might mean reading hundreds or thousands or millions and billions of rows just to retrieve a single row However, if SQL Server knows that there is an index on a column (or columns) of a table, then it may be able to use that index to search for matching records more efficiently In SQL Server 2005, a table is contained in one or more partitions.

The configure.scan file produced by running the autoscan program for the sample application looks like the following: # -*- Autoconf -*# Process this file with autoconf to produce a configure script. AC_PREREQ(2.59) AC_INIT(FULL-PACKAGE-NAME, VERSION, BUG-REPORT-ADDRESS) AC_CONFIG_SRCDIR([fibonacci.c]) AC_CONFIG_HEADER([config.h]) # Checks for programs. AC_PROG_CC # Checks for libraries. # Checks for header files. AC_HEADER_STDC AC_CHECK_HEADERS([stdlib.h])

You can see already that the text doesn t look as good. Now let s zoom in again, as shown in Figure 7-81.

A partition is a user-defined unit of organization which allows you to horizontally partition data within a table and/or index, while still maintaining a single logical object When a table is created, by default, all of its data is contained within a single partition A partition contains heaps, or, when indexes are created, B-tree structures..

# Checks for typedefs, structures, and compiler characteristics. # Checks for library functions. AC_OUTPUT To use this with the sample programs shown in 6, you need to remove the line referring to config.h, since the sample program doesn t use that include file, and add the following line near the end of the file telling it to create a Makefile: AC_CONFIG_FILES([Makefile]) The autoconf macros in the autogenerated file are defined in Table 7-2.