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Modifications made by using the WRITETEXT and UPDATETEXT commands are not reflected in the full-text index and are not tracked through change tracking.

Specifies a stoplist to be associated with the full-text index. If this option is not specified, the default full-text system stoplist is used. The options for this argument are as follows:

SYSTEM Specifies that the default system stoplist is associated with this full-text index. Stoplist_name Specifies the valid name of an existing stoplist to be associated with this full-text index.

The following code creates a full-text index on the Description column in the Production.ProductDescription table. The full-text index uses the AW2008FullTextCatalog and uses the system stoplist:

CREATE FULLTEXT INDEX ON Production.ProductDescription (Description) KEY INDEX PK_ProductDescription_ProductDescriptionID ON AW2008FullTextCatalog WITH STOPLIST = SYSTEM;

When you write full-text queries, you can choose between the CONTAINS and FREETEXT predicates and the CONTAINSTABLE and FREETEXTTABLE functions. These commands provide you with a variety of query terms that allow you to return different forms of data. In this section, you learn the functionality of these predicates and functions and examine samples of each type of query.

As you are learning about and practicing full-text queries, you should understand the tools available to help you troubleshoot and understand the query results being returned.

ith SQL Server 2000 and SQL Server 2005, I had several experiences building full-text queries against data where symbols were included in our searches.

For example, searching for n/a and C#, we had to execute extensive test queries on different data samples to determine what would be returned by a variety of queries. There was no easy way to see how the full-text search engine would interpret a particular query. Now, with SQL Server 2008, the sys.dm_fts_parser dynamic management function (DMF) shows you the results of the word breaker for different terms based on the input and term operators.

When you execute a full-text query before the full-text population has completed, the query might return only a portion of the matching rows. You can use the FULLTEXTCATALOGPROPERTY function to determine the population status of the full-text catalog. If a population is in progress, a value of 1 is typically returned. You would execute the following command to verify the population status of the AdvWksDocFTCat catalog:

SELECT FULLTEXTCATALOGPROPERTY('AdvWksDocFTCat', 'PopulateStatus');

In addition, the sys.dm_fts_index_population dynamic management object returns current population status. Figure 8-6 displays the sys.dm_fts_index_population function in its simplest form.

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To make the results more readable, you can create stored procedures that return a more user-friendly output. The code shown here uses aliases and system functions to improve the readability of the sys.dm_fts_index_population dynamic management view (DMV). Figure 8-7 shows the results of this query:

SELECT DB_NAME(database_id) AS 'Database Name' , database_id AS 'DB_ID' , OBJECT_NAME(table_id) AS 'Table Name' , table_id , population_type_description AS 'Population Desc.' , status_description AS 'Status Desc.' , completion_type_description AS 'Completion Desc.' , start_time FROM sys.dm_fts_index_population;

To view what columns are included in a full-text index, you can use the sys.fulltext_index_ columns catalog view, as shown in the following command.

SELECT OBJECT_NAME (object_id) AS TableName , object_id , COL_NAME(object_id, column_id) AS ColumnName , column_id , COL_NAME(object_id, type_column_id) AS TypeColumn , language_id FROM sys.fulltext_index_columns;

If a full-text query does not return the expected result set, you can use the sys.dm_fts_parser DMF to view the final tokenization result from the query. The tokenization result is based on the input term and conditions, such as the word breaker, thesaurus, and stoplists used. The syntax for the sys.dm_fts_parser function is as follows:

sys.dm_fts_parser('query_string', lcid, stoplist_id, accent_sensitivity)

The following arguments are used with this function:

query_string Defines the string for which you would like to view the word breaker output. This string can include any valid options from the CONTAINS predicate, including INFLECTIONAL, THESAURUS, and Boolean operators. lcid