The Art of SQL Server FILESTREAM - Red Gate Software

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Chapter 11: FileTableSemantic searchSemantic search is a new feature in SQL Server 2012 and allows for writing moreadvanced queries that can include the relationship between words in the FileTablecontents. Scenarios that are enabled by this feature include the automatic extractionof key words in a document (to populate a tag cloud, for example) or the creation of adocument similarity index to compare documents with each other.An exhaustive discussion of the semantic search feature and its linguistic underpinningsis not appropriate for this book. However, we will examine how to:• enable semantic search on a FileTable which already has full-text indexing enabled• write a basic query which identifies keywords in a specified document.Prepare the server for semantic searchBooks Online has a complete discussion of the prerequisites for semantic search (http://brurl.com/fs17). During installation, the Full-Text and Semantic Extractions for Searchinstance feature must be selected.After installation, a semantic language statistics database must be installed to the systemand attached to the SQL Server instance. This database is not installed with SQL Server2012. Instead, you must execute a separate Windows Installer package to install thedatabase. Afterwards, you must attach the database to your SQL Server instance.Finally, the semantic language statistics database must be registered by calling thesp_fulltext_semantic_register_language_statistics_db stored procedure,specifying the semantic language statistics database.432
Chapter 11: FileTableLanguage supportLanguage support for semantic search is more limited than for full-text indexing. Byquerying the sys.fulltext_semantic_languages catalog view, a list of supportedlanguages can be obtained.Add a semantic search indexTo add semantic search to the full-text index created in Listing 11-29, refer to the code inListing 11-31.ALTER FULLTEXT INDEX ON DocumentsALTER COLUMN file_streamADD Statistical_SemanticsListing 11-31:Create a semantic search index on an existing full-text index.Execute a semantic queryBy way of example, we will execute a semantic query on the Documents FileTableto identify keywords in a file called Resume.docx in the root folder of the FileTable(Listing 11-32).-- Find the key value of the document to useDECLARE @path_locator HIERARCHYIDSELECT @path_locator = path_locatorFROM DocumentsWHERE name = 'Resume.docx'AND path_locator.GetLevel() = 1433
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DBA HandbooksThe Art ofSQL Server F
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Copyright June 2012ISBN 978-1-90643
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Updating and deleting FILESTREAM da
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Creating the stored procedure to fe
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File Backups and Piecemeal Restores
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Setting Up the Server for FileTable
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Using SSMS to check that FILESTREAM
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Sven AeltermanSven Aelterman is a l
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Finding time for writing such a len
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IntroductionWhen I first started my
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The secondary audience for this boo
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Chapter 1: Storing and ManagingUnst
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Chapter 1: Storing and Managing Uns
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Setting the access levelChapter 1:
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Data usage patternsChapter 1: Stori
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Chapter 2: Getting Started with FIL
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Chapter 3: Accessing FILESTREAMData
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Chapter 3: Accessing FILESTREAM Dat
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Chapter 4: FILESTREAM with EntityFr
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Chapter 4: FILESTREAM with Entity F
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Chapter 5: FILESTREAM with ASP.NETa
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Chapter 5: FILESTREAM with ASP.NET
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Chapter 6: FILESTREAM with SSIS and
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Creating a data sourceChapter 6: FI
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Chapter 7: FILESTREAM Database Admi
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Fixing corrupted dataChapter 7: FIL
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Chapter 8: Backup and Restore for F
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Chapter 9: Investigating FILESTREAM
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Chapter 10: Integrating FILESTREAMw
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Chapter 10: Integrating FILESTREAM
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Appendix A: Configuring FILESTREAM
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Appendix A: Configuring FILESTREAM
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