Comments on: SQL SERVER – Difference Between Index Rebuild and Index Reorganize Explained with T-SQL Script http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/ Personal Notes of Pinal Dave Thu, 09 Feb 2012 19:36:10 +0000 hourly 1 http://wordpress.com/ By: Shalabh Gupta http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-244513 Fri, 27 Jan 2012 11:56:47 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-244513 Hi Pinal,

My Full-Text search takes a long time to perform the search operation. The table on which the Full Text is enabled, contains 97 Lac records and every 1 hour 3 to 4k records are imported to this table.

During the FTS, CPU shows 100% performance on the database server with high CPU consumption of this process: MSFTESQL

The rebuilt on the full text catalog is performed every night. I also tried to do a reorganize every-night but it did’nt helped me.

Could you please guide me what should I do in this case and will Rebuild or Reorganize of FTI , boost performance.

]]> By: sharjeel http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-241337 Fri, 20 Jan 2012 14:53:47 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-241337 i am confused, when i used penal command on adventurework Db its works fine.
but when i used the following on sql2005 enviornment it always give me error, please advise

USE DB;
GO
ALTER INDEX ALL ON dbo.mytable REBUILD
GO

error:

Msg 156, Level 15, State 1, Line 1
Incorrect syntax near the keyword ‘INDEX’.

]]> By: Hemant Korde http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-236028 Thu, 12 Jan 2012 13:02:50 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-236028 Hi Pinal,

Thank you.

Can you please explain the conditions under which SQL Optimizer uses a wrong index than what it should logically? For example, using a clustered index scan instead of using a NC which was created for that particular column. For example, I am searching for VENDORS and there is a NC index on VENDORS but SQL is using a Clustered INdex that is on an identity column.

Hemant

]]> By: SQL SERVER – Non-Clustered Index and Automatic Rebuild – Quiz – Puzzle – 11 of 31 « SQL Server Journey with SQL Authority http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-235692 Thu, 12 Jan 2012 01:31:35 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-235692 [...] Server Interview Questions and Answers ISBN: 1466405643 Page#67 Difference Between Index Rebuild and Index Reorganize Explained with T-SQL Script Fragmentation – Detect Fragmentation and Eliminate Fragmentation Generate Report for Index [...]

]]> By: Ben Reyes http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-224602 Fri, 23 Dec 2011 19:24:23 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-224602 The whitepaper on sql server 2000 indexing suggests ignoring anything under 1000 pages.

]]> By: Ben Reyes http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-224594 Fri, 23 Dec 2011 19:08:27 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-224594 What size are the tables?

Small tables (for me around 200 pages) will always have high fragmentation. For these tables you don’t really gain much by having an index on them anyway.

]]> By: zahid khan http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-223690 Thu, 22 Dec 2011 13:29:19 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-223690 I have set up maintenance Plan for Rebuilding Indexes on a nightly basis. It runs successfully, but does not de-fragment the indexes. I have had a discussion on this with Microsoft Engineers. and They informed me that Rebuilding Indexes with Maintenance Plan sometimes does not de-fragment the indexes. But I am not happy with this statement. What do you think of it?

]]> By: Dallara http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-197006 Wed, 16 Nov 2011 16:14:59 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-197006 Is there any metadata info which tells when a INDEX was last reorganised or rebuilt?

]]> By: prabhu http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-192108 Thu, 10 Nov 2011 06:58:07 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-192108 How to Change collation on master database, SQL server that has different collation on master and user database

]]> By: Onke http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-178828 Fri, 14 Oct 2011 13:33:15 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-178828 This is very helpful but when I try to defrag my indexes, nothing happens…I drop and recreate them and they are still fragmented…and yes I have the update statistics command after rebuilding or reorganizing…if any of you guys know why this is happening, please let me know.

]]> By: AJITESH MALHOTRA http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-177074 Mon, 10 Oct 2011 07:17:39 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-177074 How to rebuild all the indexes in a database?Please suggest me.

]]> By: Miles http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-172950 Wed, 28 Sep 2011 21:04:55 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-172950 I do a very compreshensive index maintenance which allows for rebuilds and reorgs based upon certain parameters of fragmentation. I also give the option to do Online Rebuilds. My process logs all fragmentation before and after the rebuild or reorg. Of course a rebuild reduces the fragmentation greater than a reorg. But I have found one problem. When I choose to do an Online Rebuild, the fragmentation actually is higher after the rebuild than it is before. The version of SQL Server is 2008 10.0.2734. Is there an explanation as to why the Online Rebuild would cause increased fragmentation whereas a regular rebuild or reorg would not?

MS

]]> By: Dan http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-154979 Mon, 08 Aug 2011 09:53:04 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-154979 How did Microsoft came with these thresholds?

if frag_level30% then REBUILD

The idea is that I dont have Enterprise Edition’in production environment and I want to be able to do index maintenance without blocking the tables. And so my only option is to ALTER INDEX … REORGANIZE.

]]> By: refog keylogger http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-148761 Sat, 16 Jul 2011 18:45:30 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-148761 Excuse for that I interfere ?At

me a similar situation. I invite to discussion. Write here or in PM.

]]> By: Margaret Norkett http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-147971 Wed, 13 Jul 2011 11:30:45 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-147971 I see a lot of people asking why thier databases and log files grow when they rebuild indexes. Mr. Pinal has explained that an index rebuild actually drops and then recreates the index. This means space is consumed in the process and if your database is set to full, this also means transactions are written to the log. As a part of your index rebuilding, you should backup both the database and the log in order to reclaim space used in the process.

]]> By: GD http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-143109 Thu, 23 Jun 2011 04:35:46 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-143109 A FK has nothing to do with indexes. It is however recommended to put an index on a FK, but the FK itself is not an index, only a constraint.

]]> By: Rached N. http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-142959 Wed, 22 Jun 2011 11:16:10 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-142959 Hi every one. I’m not a dba specialist, but a .net developer.
As i understand, Index Rebuild drops current index values and recreates new ones. In this case, what about the joined and related tables where the value is used as FK in another table ? This also needs to be updated to the new values?
Appreciate any explanation.

]]> By: GD http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-139242 Mon, 06 Jun 2011 15:07:48 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-139242 depends on the fragmentation and the size of the table. With reorganizzing you must be aware that this theoretical example will reorganize the whole table because it uses a kind of bubble-sort method: if the logical first page is physically the last.

]]> By: George http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-139239 Mon, 06 Jun 2011 14:51:16 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-139239 Supposing my database is in Full Recovery mode. This means that doing an index rebuild will take some considerable size on the transaction log. (Index rebuild drops and recreates – using Create Index – all indexes). What about index reorganization? Is there also a considerable size impact on the transaction log?

Thanks!
George.

]]> By: Hari Krishna http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-135161 Thu, 19 May 2011 04:12:39 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-135161 Hi Dave,

Could You Please Provide Query Performance Tuning in Sql Server 2008.

Thanks
HariKrishna

]]> By: jamesnithya http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-124803 Thu, 24 Mar 2011 08:55:56 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-124803 how to rebuild index on a db as a whole?

]]> By: Hendra http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-117492 Wed, 09 Feb 2011 04:29:42 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-117492 why my log files become full ?, from 5GB to 50GB when rebuilding all the indexes ? and after it finished, my log file didn’t go small…
I use FULL recovery model….
is there any way to prevent this ?

and I’ve wierd situation, sometimes, after I rebuild index the fragmentation of that index is still high, 70%
but when I do backup first, and doing rebuild index after that, the fragmentated index become small

]]> By: Josh http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-112365 Fri, 21 Jan 2011 02:12:05 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-112365 good day…

I just want to know what to do when there are clustered index and non-clustered index in one table (i found out that the reason why i cant rebuild online is because of these – clustered and non-clustered in one table)

some field says rebuild and the other reorganize.

but when i tried to rebuild it i got an error because there are clustered index.

should i use rebuild index (online or offline)
or
should i just reorganize it?

thanks…

]]> By: Nilam Shinde http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-111195 Sun, 16 Jan 2011 07:56:56 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-111195 I m facing same problem.When I rebuild index the db size is grow and when I reorganize the db size is not grow.In my case log file grows.

]]> By: GD http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-102313 Fri, 26 Nov 2010 14:29:26 +0000 http://blog.sqlauthority.com/2007/12/22/sql-server-difference-between-index-rebuild-and-index-reorganize-explained-with-t-sql-script/#comment-102313 Me too, I miss 2 very important things:

1. rebuilding an index automatically also updates the statistics! If you reorganize, you should always update your statistics afterwards!

2. some mention the option ONLINE of rebuilding, but be aware that some cursors will fail when they are launched when the index rebuilding is done “error: schema modification was detected”

]]>