Comments on: SQL SERVER – Fillfactor, Index and In-depth Look at Effect on Performance http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/ Personal Notes of Pinal Dave Fri, 10 Feb 2012 04:45:32 +0000 hourly 1 http://wordpress.com/ By: SQL SERVER – Correct Value for Fillfactor – Quiz – Puzzle – 24 of 31 « SQL Server Journey with SQL Authority http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-243206 Wed, 25 Jan 2012 01:32:00 +0000 http://blog.sqlauthority.com/?p=7561#comment-243206 [...] SQL SERVER – What is Fill Factor and What is the Best Value for Fill Factor Fillfactor, Index and In-depth Look at Effect on Performance Rebuild Every Index of All Tables of Database – Rebuild Index with FillFactor Change Default Fill [...]

]]> By: Kasib http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-222508 Wed, 21 Dec 2011 01:41:41 +0000 http://blog.sqlauthority.com/?p=7561#comment-222508 Hey, I am in the process of preparing for 70-450 exam and I came across this question on the net. I eliminated the two answers, B,C. Index is performing fine, so no need to rebuild or reorganize. Can you please help.

QUESTION::::
You are designing index maintenance strategies. One large table has a clustered index which never has a fragmentation percentage of more than 2 percent. There is an XML column in the table, and INSERTs are run frequently against this table. You want to minimize the impact of reindexing operations on performance.

A) Drop the clustered index on the large table.
B) Rebuild the clustered index of the large table monthly.
C) Exclude the clustered index from reorganizing and rebuilding.
D) Reduce the fillfactor on the clustered index.

]]> By: SQL SERVER – Interview Questions and Answers – Frequently Asked Questions – Day 20 of 31 Journey to SQLAuthority http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-149458 Wed, 20 Jul 2011 01:31:14 +0000 http://blog.sqlauthority.com/?p=7561#comment-149458 [...] Specifying a fill-factor value of 70 would imply that 30 percent of each page will be left empty, providing space for index expansion as data is added to the underlying table. The fill-factor setting applies only when the index is created or rebuilt. (Read more here) [...]

]]> By: Kuldip.Bhatt http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58899 Tue, 22 Dec 2009 10:49:10 +0000 http://blog.sqlauthority.com/?p=7561#comment-58899 very nice explanation and all the comments are very good.

]]> By: Pinal Dave http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58847 Sun, 20 Dec 2009 13:35:27 +0000 http://blog.sqlauthority.com/?p=7561#comment-58847 Hello Srinivas,

Yes, when free space specified by fillfactor, fills after few insertion, page split wll occure. The benifit of fillfactor is to allow insert/update until the free space not filled. The free space specified by fill factor is reserved everytime the index is rebuild or defragmented. So we just have to plan a proper schedule to degrag/rebuild the indexes to maintain the free space and to avoid the page split.

Kind Regards,
Pinal Dave

]]> By: Srinivas http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58790 Fri, 18 Dec 2009 07:54:31 +0000 http://blog.sqlauthority.com/?p=7561#comment-58790 Hi Pinal,

Nice Post.

But, I have a question here. In order to avoid page splits we use fill factor. If we don’t specify fill factor on a table, inorder to accommodate a new record page split happens, and while page split happening, it moves half of the page to another page and this is costly.

Lets say if i have mentioned as fillfactor 80, means it will reserve 20% of every page for new records. what if this 20% of space also filled with new records, what will happen at that time?

If it results in a page split, what is the difference of having a page split at the insertion or very first record or after sometime?

Please answer my question…

]]> By: Chrystal http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58779 Thu, 17 Dec 2009 21:12:21 +0000 http://blog.sqlauthority.com/?p=7561#comment-58779 Pinal,That is very clear explanation. before I never know why we care about fillfactor. I ‘ve always used your site for help. Thank you so much for your all very awesome articles.

]]> By: Rama http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58752 Thu, 17 Dec 2009 09:58:28 +0000 http://blog.sqlauthority.com/?p=7561#comment-58752 Hi Pinal,

You have nicely summerised a complicated as well as important subject.

Rama

]]> By: Pinal Dave http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58738 Wed, 16 Dec 2009 20:02:50 +0000 http://blog.sqlauthority.com/?p=7561#comment-58738 Hello Laerte,

Yes, a fillfactor to 100 for any table that can be updated would definately cause page split issue. FillFactor 100 is only suitable for read-only tables.
Thank you.

Regards,
Pinal Dave

]]> By: Ramdas http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58725 Wed, 16 Dec 2009 15:47:47 +0000 http://blog.sqlauthority.com/?p=7561#comment-58725 Nice tip on the fill factor for inserting rows with columns as identity. It is a key parameter to keep in mind while designing databases.

]]> By: kapil Bhargava http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58714 Wed, 16 Dec 2009 11:41:34 +0000 http://blog.sqlauthority.com/?p=7561#comment-58714 It proved to be very informative

]]> By: kapil http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58713 Wed, 16 Dec 2009 11:40:28 +0000 http://blog.sqlauthority.com/?p=7561#comment-58713 Thanks for this post. this is very informative

]]> By: Suhas http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58700 Wed, 16 Dec 2009 06:31:24 +0000 http://blog.sqlauthority.com/?p=7561#comment-58700 Nice One
Thanks for the explanation

Suhas

]]> By: Ritesh Shah http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58691 Wed, 16 Dec 2009 05:17:21 +0000 http://blog.sqlauthority.com/?p=7561#comment-58691 You read my mind Sir, I was thinking to dig almost this topic but time doesn’t permit me. thank you very much for this great post. :)

]]> By: Laerte Junior http://blog.sqlauthority.com/2009/12/16/sql-server-fillfactor-index-and-in-depth-look-at-effect-on-performance/#comment-58683 Wed, 16 Dec 2009 02:13:26 +0000 http://blog.sqlauthority.com/?p=7561#comment-58683 Hi Pinal, Great Post. I totally agree “if the index key column is an IDENTITY column, the key for new rows is always increasing and the index rows are logically added to the end of the index”
I just believe there is not a rule to say that the if index key column is an IDENTITY column, you can configure the fillfactor with 100%
Even if you have index key column is an IDENTITY and configuring fillfactor to 100% if you have variable-length columns (varchar, nvarchar, varbinay) and they suffer constant change or change more than insertion, you will probably have problems with page splits . In these cases perhaps, even though the identity column, leaving a smaller fillfactor may be more appropriate.

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