The Art of SQL Server FILESTREAM - Red Gate Software

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Chapter 7: FILESTREAM Database AdministrationConnect to your instance using DAC and run the query in Listing 7-10, which will retrievethe list of garbage files in the current database. If you have followed the example, thequery will return details of two garbage files.SELECTphysical_name AS FILESTREAMFolder,rowset_guid AS TableFolder,column_guid AS ColumnFolder,FILESTREAM_value_name AS FILESTREAMFileFROM sys.filestream_tombstone_2073058421 ftINNER JOIN sys.database_files dfON df.file_id = ft.file_id/*FILESTREAMFolder TableFolder ColumnFolder FILESTREAMFile----------------------- ------------- ------------- ---------------C:\Demos\FS\NorthPoleFS 448BFCA8-6... 91DFDC80-E... 00000018-000...C:\Demos\FS\NorthPoleFS 448BFCA8-6... 2A7202BA-4... 00000018-000...*/Listing 7-10:Retrieving the list of garbage files.FILESTREAM Data Corruption and DBCC ChecksOne of the most undesirable situations for a database administrator is databasecorruption. In most cases, regular database checks and maintenance activities will help adatabase administrator to ensure that the databases are healthy and free from corruption.A common cause of a corrupted FILESTREAM database is an "over-enthusiastic" administrativeuser who wants to play with the FILESTREAM data files directly. Remember thatall access to the FILESTREAM data should be made through SQL Server. Direct access tothe FILESTREAM data using the file system tools may corrupt your database.284
Chapter 7: FILESTREAM Database AdministrationThe following sections examine a few common causes of a corrupt FILESTREAMdatabase, and how to use DBCC CHECKDB or DBCC CHECKTABLE to check the consistencyof your database along with the FILESTREAM data, and try to fix any corruption issues.Corruption caused by missing FILESTREAM datafilesThe recommended way to delete a FILESTREAM data file is by setting the value of thecolumn to NULL by performing a T-SQL UPDATE operation. If a user or software processdirectly deletes a file from the FILESTREAM data container, you will end up with acorrupted database. Let's replicate this scenario here (we're about to deliberately corrupt adatabase, so only do this on a test database on a test server).Run the script in Listing 7-11 to create a new FILESTREAM-enabled database with aFILESTREAM column and two rows.USE masterGOIF DB_ID('NorthPole') IS NOT NULLDROP DATABASE NorthPoleGOCREATE DATABASE NorthPole ON PRIMARY (NAME = NorthPole,FILENAME = 'C:\ArtOfFS\Demos\Chapter7\NorthPole.mdf'), FILEGROUP NorthPole_fs CONTAINS FILESTREAM(NAME = NorthPole_fs,FILENAME = 'C:\ArtOfFS\Demos\Chapter7\NorthPole_fs') LOG ON (NAME = NorthPole_log,FILENAME = 'C:\ArtOfFS\Demos\Chapter7\NorthPole_log.ldf')GOUSE NorthPoleGO285
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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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Chapter 9: Investigating FILESTREAM
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Chapter 10: Integrating FILESTREAMw
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Chapter 10: Integrating FILESTREAM
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Chapter 11: FileTableThe addition o
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Chapter 11: FileTableColumn Namestr
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Chapter 11: FileTableColumn Nameis_
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Chapter 11: FileTableUSE NorthPoleG
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Chapter 11: FileTableMore on using
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Chapter 11: FileTableFigure 11-1:Se
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Chapter 11: FileTableperformance wh
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Chapter 11: FileTableany files or f
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Chapter 11: FileTable-- If the 'Nor
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Chapter 11: FileTableBy default, th
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Chapter 11: FileTableIt is possible
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Chapter 11: FileTableFigure 11-4:Ch
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Chapter 11: FileTableFurthermore, i
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Chapter 11: FileTableCreating folde
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Chapter 11: FileTableAdding rows us
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Chapter 11: FileTable-- Find the pa
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Chapter 11: FileTable-- Insert a ne
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Chapter 11: FileTablestring SqlText
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Chapter 11: FileTableAs a best prac
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Chapter 11: FileTableSELECT file_st
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Chapter 11: FileTable• non_transa
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Chapter 11: FileTable• filename_c
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Chapter 11: FileTableListing 11-29
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Chapter 11: FileTableLanguage suppo
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Chapter 11: FileTableInvestigating
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Chapter 12: Planning, Configuration
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Appendix A: Configuring FILESTREAMo
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Appendix A: Configuring FILESTREAM
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