Question

Index rebuild and index reorg in sequence ..

Asked by: Hilaire

Hi experts,

While I was working at a customer's site yesterday, I noticed something that sounded a little weird to me :
The SQL Server 2008 DB had a daily maintenance plan that did the following :
- index rebuild
- index reorg
on the same tables, same indexes.
I was assuming that an index rebuild was more complete than the reorg, and that an index rebuild would automatically use contiguous disk spaces to re-create the indexes, hence defeating the purpose of a reorg (wich could be compared to some kind of logical defragmentation, unless i'm wrong).

I've worked mostly with other DBMS's these days, so maybe I missed something ??

BTW, from my early SQL Server days I remembered that most experts would rather design their own "maintenance plans" with custom jobs/stored proceduresm because custom jobs were both more dynamic (new tables included in the plan "automatically") and more stable. Did SQL Server 2008 change something to this ?

Any advice/comment welcome

Hilaire

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Asked On
2009-06-16 at 00:53:23ID24494701
Tags

Maintenance plan; SQL Server 2008

Topic

SQL Server 2008

Participating Experts
2
Points
500
Comments
5

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Answers

 

by: non_zeroPosted on 2009-06-16 at 01:02:57ID: 24635743

Check the maintenance plan .. both steps  must be set .. delete one of them  but only if both steps contains same tabless

 

by: HilairePosted on 2009-06-16 at 06:35:12ID: 24637777

To summarize, daily maintenance plan does the following :

Step One :  index rebuild for tables A, B, C
Step two :  index reorg for tables A, B, C  (same table list than step one above)

I tend to think step two is not necessary and could be suppressed. It's not a critical issue but I would use saved time to compute statistics instead (not computed on a daily base for the moment).

I'm failing to see why step one + step two would be better than step one alone : could anyone shed some light on this ? or share one's opinion ?

 

by: wolfman007Posted on 2009-06-16 at 07:38:49ID: 24638479

I agree rebuilding and then straight away reorganising the same indexes seems like a waste of resources.

Rebuilding drops and creates new contiguous indexes so there is no need to reogranise them that I can see.

For daily maintenance I would tend to use the following 2 tasks
1) reorganise indexes
2) update statistics

Then once a week for weekly maintenance
1) rebuild indexes

 

by: wolfman007Posted on 2009-06-16 at 07:42:18ID: 24638509

Reorganize Index Task
The Reorganize Index Task is used to defragments & compact both clustered and non-clustered indexes on tables and views. The index reorganize is best suited when the index are not heavily fragmented. This process takes very less system resources when compared to rebuilding an index. If the indexes are heavily fragmented then the best choice will be to rebuild indexes using the Rebuild Index Task.

Rebuild Index Task
The Rebuild Index task can be used to organize data which is there on the data and index pages by rebuilding indexes. This helps to improve the performance of index seeks and index scans. This task also optimizes the distribution of data and free space on the index pages, thereby allowing faster future growth. If this task is used to rebuild the indexes in a single database then it allows you to choose views and tables for which you want to rebuild the index. This task also has options such as Sort results in tempdb and Keep index online while reindexing. However these operations require sufficient disk space in tempdb database.

from the following web site

http://www.sql-server-performance.com/articles/dba/Overview_of_Maintenance_Plans_in_SQL_Server_2008_p1.aspx

 

by: wolfman007Posted on 2009-06-16 at 07:46:17ID: 24638548

So it seems to be an either one or the other depending on how heavily fragmented the idexes are, both seems to be a bit redundant.

20120131-EE-VQP-002

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