The Art of SQL Server FILESTREAM - Red Gate Software

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Chapter 12: Planning, Configuration and Best PracticesLapDuration (in seconds)with short file names:File namesEnabledDisabled5 11 4 File_5_1.txt to File_5_5000.txt6 15 3 File_6_1.txt to File_6_5000.txt7 21 4 File_7_1.txt to File_7_5000.txt8 51 1 File_8_1.txt to File_8_5000.txt9 106 3 File_9_1.txt to File_9_5000.txt10 3 4 File_10_1.txt to File_10_5000.txt11 4 2 File_11_1.txt to File_11_5000.txt12 4 2 File_12_1.txt to File_12_5000.txt13 5 1 File_13_1.txt to File_13_5000.txt14 7 2 File_14_1.txt to File_14_5000.txt15 7 2 File_15_1.txt to File_15_5000.txt16 10 2 File_16_1.txt to File_16_5000.txt17 10 1 File_17_1.txt to File_17_5000.txt18 13 2 File_18_1.txt to File_18_5000.txt19 14 2 File_19_1.txt to File_19_5000.txt20 3 1 File_20_1.txt to File_20_5000.txtTable 12-1:Performance test results for short file names.442
Chapter 12: Planning, Configuration and Best PracticesInitially, I was surprised that, when the test was run with short file names enabled, theduration went up with each lap (up to Lap 9) and then fell down to 3 seconds from 106.The same happened at Lap 19 too. Then I realized that the delay has to do with theamount of data NTFS has to look at before creating a new file. After Lap 9, the file namepattern changed and the same happened after Lap 19. It indicates that not only thenumber of files in the folder, but also the way files are named, affects the performancewhen short file names are enabled.SQL Server names FILESTREAM data files based on the LSN that created theFILESTREAM data file. Based on the workload and usage pattern on your server, the filenames on disk may or may not follow a specific pattern. The system overhead to createshort file names depends on the number of files with similar names in the same folder.If the file names created are similar, you might notice a performance difference afterdisabling short file names. It is important to note that the impact of short file namescomes into the picture only when new files are created. If your application does not createnew files, the impact of the change may often not be noticeable.Compressing FILESTREAM dataWhen data is compressed, the I/O pressure on the system is reduced because less datais read from, and written to, the disk. On the other hand, CPU usage increases becausethe storage engine has to compress the data before writing to the disk, and decompressit on reading. Depending upon your workload, CPU, and I/O subsystem capabilities,compression may or may not help. In most cases, I have seen that compression helps ifthe data is compressible.The SQL Server row- and page-level compression feature does not compressFILESTREAM data files. However, SQL Server allows FILESTREAM data files to be storedon compressed disk volumes. This will reduce the storage space needed for the data. Thedecision to go with compressed FILESTREAM storage should be taken only after clearly443
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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 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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Page 487: About Red GateYou know those annoyi
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