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I Cannot Defrag .mdf File


Does the electoral vote count ever get reallocated between states? Note that none of the defragmentation techniques in SQL Server (e.g., DBCC INDEXDEFRAG) address the problem of physical fragmentation within the OS file system. CREATE TABLE tempdb..file_stats ( Row_ID INT IDENTITY (1, 1) , sample_ms INT, num_of_reads BIGINT, num_of_bytes_read BIGINT, io_stall_read_ms BIGINT, num_of_writes BIGINT, num_of_bytes_written BIGINT, io_stall_write_ms BIGINT, io_stall BIGINT, size_on_disk_bytes BIGINT, CONSTRAINT Row_ID_PK PRIMARY And if so, what is the reasoning?

Why is this? Is it an issue and would running a disk defrag for this file improve DB performance? I’ve been surprised to find that many defragmenters don’t make any attempt to lessen the fragmentation of a file if they can’t defragment it completely. Join them; it only takes a minute: Sign up Is physical file fragmentation of the mdf file an issue? Homepage

Sql Database Defragmentation

That’s because (by default) Windows does not consider any file over 64 MB to be fragmented, and if you’re using the GUI interface accessed via Windows Explorer to check for it asked 7 years ago viewed 1500 times active 7 years ago Upcoming Events 2016 Community Moderator Election ends Nov 22 Visit Chat Related 3Repairing an MDF file80What is an MDF file?-1howt Clustered indexes try to organize the index such that only sequential reads will be required. But my question is not whether I should defragment it, but rather why it's not letting me.

I will do both types of defragging. with your description of the problem, we can provide a tested, verifiable solution to your question! Otherwise it starts to look like guessing and trying. What Is Database Fragmentation It is a pain to because it requires a lot of space on disk as it is a huge file so I want to be sure whether it is necessary.

You cannot post JavaScript. As the file concerned was the Primary mdf, I could not empty and and drop the file, which is what I would ordinarily have done under these circumstances, and a detach/attach On my (32-bit) server, an edited down version of my .cmd file looks like this: "C:\Program Files\Contig\Contig" -v -s "C:\Windows\System32\drivers\AVG\*.*""C:\Program Files\Contig\Contig" -v -s "C:\Documents and Settings\All Users\Application Data\AVG2013\*.dat""C:\Program Files\Contig\Contig" -v -s Try to use another defrag tool that let you defrag the free space (I use Defraggler from Piriform), in order to create sufficient space to defrag your .mdf to a contiguous

You cannot edit other events. Defrag Sql Server Hard Drive But it should defragement it. It ain’t so Recently, I’ve found that not all SANs “take care of it” as well as you might think. asking the question the right way gets you a tested answer the fastest way possible!

Sql Server Data File Fragmentation

Friday, September 13, 2013 - 3:02:31 PM - Daniel Farina Back To Top Hi Bill, you can use the following Performance Counter: "\LogicalDisk\Split IO/sec" This counter measures if a single IO read this article Also, this will be easier to do on smaller database files, because not as much contiguous disk space is required, and harder for larger databases. Sql Database Defragmentation I have to admit, this did fool me for a while as I was investigating one particular database file that was showing significant IO latencies compared to other files in the Sql Server Defragmentation Best Practices comments (0) 12/11 Tracking SQL Server IO performance with Performance Monitor (Perfmon) comments (0) October (1) 2014 (4) December (1) October (1) May (1) February (1) 2013 (7) November (1) July

You cannot post IFCode. It sounds like it will but only if there are clustered indexes which are used a lot. –Jimmymcnulty Apr 5 '09 at 23:28 add a comment| 3 Answers 3 active oldest statement into that table to give the volunteers here representative data. Hot Network Questions In Revelation 19:16, of which kings is Jesus king? Defrag Sql Database 2012

An attempt to make a linked list iterator "safe" What is role of palladium in hydrogenation reactions? I have never had an issue on any of my servers and they run this tool in the background 24x7. All comments are reviewed, so stay on subject or we may delete your comment. Use the resolution technique most suitable to the SLAs and the situation; if you have the luxury of downtime, the files can probably be defragmented more quickly as there will be

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Sysinternals Contig You cannot post new polls. What’s the big deal?

It could be a staging table whose gets truncated and then loaded again with 1000 rows and if the table is a heap and the rest of the database has a

After defragging the drive, the MDF comes up in the list of files that could not be defragmented. –LesterDove May 25 '12 at 13:02 Acutally the info is my You cannot send private messages. Is adding the ‘tbl’ prefix to table names really a problem? Database Index Fragmentation Other smaller .mdf files on the same drive are defragmented.

Secondly, (and this may affect others as well) contig.exe does not defragment files on mount points and, unfortunately, this database was utilising mount points. Make sure you backup the database before defragging just to stay on the safe side.   After Windows defragging, you should do an index REBUILD also for maximum performance gain.   The first thing I would do is check out the IO performance of the database(s) in question. This kind of of improvement is usually achieved by throwing a lot of money and tin at a problem, but it cost us nothing, so I think it’s a big deal.

After I install I defrag as well. Check the output of contig.exe when aimed at those files. Mimic several autogrows by manually altering the size of the data file and growing it by e.g. 1MB at a time. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

Do Morpheus and his crew kill potential Ones? with the tool I get the following result appears. THose files are normal files. –TomTom May 25 '12 at 17:21 add a comment| up vote 1 down vote LesterDove, the problem may be your .mdf file size: your disk have First a thought it was some Mark Russinovich trick, but it isn't.

What file fragmentation? You cannot edit your own posts. You should bring the database back online with the following syntax ALTER DATABASE [Your DB Name] SET ONLINE Best Regards! You cannot post topic replies.

To defrag the file simply run Contig [FileName]. I probably need to shutdown SQL Server for it to fully defragment it. share|improve this answer answered Jun 3 '12 at 12:12 tcbrazil 22619 LesterDove, did you try to defragment the free space as I told above? –tcbrazil Jun 8 '12 at