The Art of SQL Server FILESTREAM - Red Gate Software

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Chapter 7: FILESTREAM Database Administrationcontains the record is still active, and will remain so until the log is backed up. EveryFILESTREAM operation is mapped to a transaction LSN in the transaction log. UnderFULL and BULK_LOGGED recovery models, the garbage collector will remove a file onlyafter the transaction log VLF that contains the LSN associated with the FILESTREAMoperation is not part of the active log.FILESTREAM garbage collection and tombstonetablesAs we have seen, SQL Server does not support in-place updates of FILESTREAM data. Ifwe modify a BLOB value stored in a FILESTREAM column, SQL Server will create a newdisk file with the modified value. The old file will stay around for some time until it is "nolonger needed" and the garbage collector steps in and deletes it.It is interesting to note how SQL Server keeps track of the garbage files. If we modify afew FILESTREAM data values and look into the FILESTREAM data folder, we'll find manymore files than the number of rows in the table. So the question is, "Which are garbagefiles and which are not?" SQL Server creates an internal table called the FILESTREAMtombstone table to hold the details of garbage files to be removed. The garbage collectorqueries this table to identify the garbage files and removes them when those files are nolonger needed.To see this in action, run the script in Listing 7-6 to create a sample database containing atable with two FILESTREAM columns.USE masterGOIF DB_ID('NorthPole') IS NOT NULLDROP DATABASE NorthPoleGO280
Chapter 7: FILESTREAM Database AdministrationCREATE 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 NorthPoleGOCREATE TABLE [dbo].[Items]([ItemID] UNIQUEIDENTIFIER ROWGUIDCOLNOT NULLUNIQUE ,[ItemNumber] VARCHAR(20) ,[ItemDescription] VARCHAR(50) ,[ItemImage1] VARBINARY(MAX) FILESTREAMNULL ,[ItemImage2] VARBINARY(MAX) FILESTREAMNULL)Listing 7-6:Creating an example database with two FILESTREAM columns.Now we'll insert a row into the FILESTREAM table (Listing 7-7).INSERT INTO Items( ItemID ,ItemNumber ,ItemDescription ,ItemImage1 ,ItemImage2)SELECT NEWID() ,'MS1001' ,'Microsoft Mouse' ,0x1 ,0x1Listing 7-7:Inserting a row into the table.281
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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 4: FILESTREAM with EntityFr
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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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