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In this recipe, a new full-text index was created for the Production.Document table, on the DocumentSummary column (which has a varchar(max) data type). Note that more than one column can be designated for one full-text index. Stepping through the code, the first line designated the table the full-text index would be based on: CREATE FULLTEXT INDEX ON Production.Document The second line of code designated the column to be indexed, and then a pointer to the column that tells SQL Server what document type is stored in the DocumentSummary column: (DocumentSummary, Document TYPE COLUMN FileExtension) Keep in mind that the TYPE COLUMN clause is only necessary if you are indexing a varchar(max) or image type column, as you ll be assisting SQL Server with interpreting the stored data. Regular text data types such as char, varchar, nchar, nvarchar, text, ntext and xml don t require the TYPE COLUMN clause. Next, the name of the key, non-null, unique column for the table is identified: KEY INDEX PK_Document_DocumentID

ImageMagick offers several filters, all of which will perform best in certain specific situations: Point Box Triangle Hermite Hanning Hamming Blackman Gaussian Quadratic Cubic Catrom Mitchell Lanczos Bessel Sinc ImageMagick applies a reasonable default filter, normally Lanczos, if you don t specify one. The differences between these various filters are quite technical and outside the scope of this book. You can learn more about these filters at Anthony Thyssen s excellent ImageMagick tutorial at http://www.cit.gu.edu.au/~anthony/graphics/imagick6/resize/#filters. You specify a filter with ImageMagick as follows: convert -sample 400% -filter lanczos input.jpf output.jpg This example creates an output file that has dimensions four times greater than those of the input and uses the Lanczos filter to guess what the new pixel values should be.

The ON clause designates which full-text catalog the full-text index will be stored in: ON cat_Production_Document Lastly, the method of ongoing index population is designated for the index: WITH CHANGE_TRACKING AUTO Once the full-text index is created, you can begin querying it. Before we get to this however, there are other commands used for modifying or removing indexes and catalogs you should be aware of.

To support flexible array members, GCC extends them to permit static initialization of flexible array members This is equivalent to defining two structures where the second structure contains the first one, followed by an array of sufficient size to contain the data If that seems confusing, consider the two structures s1 and s2 defined as follows: struct f1 { int x; int y[]; } f1 = { 1, { 2, 3, 4 } }; struct f2 { struct f1 f1; int data[3]; } f2 = { { 1 }, { 2, 3, 4 } }; struct s1 { int i; int j[]; } s1 = {1, {2, 3, 4} }; struct s2 { struct s1 s1; int array[3]; } s2 = { {1}, {2, 3, 4} }; In effect, s1 is defined as if it were declared as s2.

In this recipe, I ll demonstrate ALTER FULLTEXT CATALOG, which you can use to: Change accent sensitive settings. Accent sensitivity defines whether or not SQL Server will distinguish between accented and unaccented characters, or treat them as equivalent characters in the search. Set the catalog as the default database catalog. REBUILD the entire catalog with all indexes in it. REORGANIZE the catalog, which optimizes internal index and catalog full-text structures. Microsoft calls this process a master merge, which means that smaller indexes are physically processed (not logically, however) into one large index in order to improve performance. The syntax for ALTER FULLTEXT CATALOG is as follows: ALTER FULLTEXT CATALOG catalog_name { REBUILD [WITH ACCENT_SENSITIVITY = {ON|OFF} ] | REORGANIZE | AS DEFAULT } The arguments for this command are described in Table 6-3. Table 6-3. ALTER FULLTEXT CATALOG Arguments

The convenience of this extension is that f1 has the desired type, eliminating the need to consistently refer to the awkward construction f2f1 This extension is also symmetric with declarations of normal static arrays, in that an array of unknown size is also written with [] For example, consider the following code:.

The REBUILD option deletes the existing full-text file system files and replaces it with a new catalog (with the indexes still intact). The ACCENT_SENSITIVITY option can only be configured when used in conjunction with a REBUILD. This causes SQL Server to optimize catalog structures and internal indexes, freeing up disk and memory resources for those full-text indexes based on frequently updated columns. Sets the catalog as the default database catalog.