Creating Full-Text Catalogs in VS .NET

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Creating Full-Text Catalogs
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Within this directory structure, as indexes are added to the catalog, subdirectories are created to contain them. You use the command s WITH clause to specify accent sensitivity. If you don t specify an option for this clause, the full-text catalog uses the setting from the database s collation. Otherwise, you can explicitly specify whether the catalog should be sensitive to accents. If you change this option later, you must rebuild all full-text indexes within the catalog. The next clause, AS DEFAULT, serves a similar purpose as setting a default filegroup. When you create full-text indexes without explicitly specifying a catalog, SQL Server creates the indexes within the default catalog. The command s AUTHORIZATION clause simply specifies the user or role that owns the catalog.
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1. What is the purpose of a full-text catalog 2. Where is a full-text catalog stored
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1. A full-text catalog provides the basic storage container for one or more fulltext indexes. 2. Full-text catalogs, along with their associated indexes, are stored in a directory structure that is external to SQL Server.
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In this practice, you create a full-text catalog to use with the AdventureWorks database. 1. Create a directory on the operating system named C:\test. 2. Launch SSMS, connect to your instance, and open a new query window. 3. Add a new filegroup to the AdventureWorks database that you will use for the fulltext catalog by executing the following batch:
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USE master GO ALTER DATABASE AdventureWorks ADD FILEGROUP FTFG1 GO ALTER DATABASE AdventureWorks ADD FILE ( NAME = N'AdventureWorksFT_data',
Lesson 1: Creating a Full-Text Catalog
FILENAME = N'C:\TEST\AdventureWorksFT_data.ndf' , SIZE = 2048KB , FILEGROWTH = 1024KB ) TO FILEGROUP [FTFG1] GO
NOTE
Filegroup must have primary file
Although full-text catalogs and indexes are stored in a directory structure external to SQL Server, the filegroup on which a full-text catalog is placed must have at least one active file. This file cannot be marked READ ONLY or taken OFFLINE.
4. Create a full-text catalog on the FTFG1 filegroup by executing the following command:
USE AdventureWorks; GO CREATE FULLTEXT CATALOG AWCatalog ON FILEGROUP FTFG1 IN PATH 'C:\TEST' AS DEFAULT; GO
Lesson Summary
The first step in setting up full-text indexing is to define a catalog to store one or more full-text indexes that are used to process queries. You use the CREATE FULLTEXT CATALOG Transact-SQL command to create a full-text catalog. Although you must associate a full-text catalog with a filegroup for backup and restore purposes, full-text catalogs are stored in a directory structure external to the database.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion CD if you prefer to review them in electronic form.
NOTE
Answers
Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
1. Where does the full-text catalog physically exist A. Within the database in which it is associated B. In the msdb database C. In an external directory structure D. In a filegroup for the database
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Creating Full-Text Catalogs
Lesson 2: Creating a Full-Text Index
After you have created a full-text catalog, you need to create one or more full-text indexes before you can execute full-text queries. In this lesson, you will review the powerful architecture of full-text indexing and then see how to create an index by using the CREATE FULLTEXT INDEX Transact-SQL command.
After this lesson, you will be able to:
Explain the terminology associated with full-text indexing. Create a full-text index.
Estimated lesson time: 20 minutes
Full-Text Index Architecture
You can build full-text indexes on textual data stored in char, nchar, varchar, nvarchar, varchar(max), text, ntext, image, varbinary, varbinary(max), and xml columns. However, the image, varbinary, and varbinary(max) columns require special handling if you want to use them for full-text processing. You use multiple helper services to build a compact and efficient full-text index. These services include word breakers and stemmers, language files, noise word files, filters, and protocol handlers. Word breakers are routines that find the breaks between words and generate a basic word list for each row within the column or columns that you are indexing. Stemmers conjugate verbs. Word breakers and stemmers work with language files to understand the words that are in the input stream. Language files, in conjunction with word breakers and stemmers, allow full-text indexing to handle multiple languages without requiring translation routines or specialized processing. Commonly used words in a language are referred to as noise words. Noise words are contained in language-specific noise files, which contain basic structural elements that are not useful for search routines. Examples of noise words for the English language are the, a, and an. When the word-breaker routine encounters a noise word for the particular language being processed, it ignores the word. Thus, a full-text index does not include all possible words in a column, but only those that are interesting for queries.
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