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Fragmentation size


Fragmentation size

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zi
zi
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Dear Friends

1-1-How to know the fragmentation size for whole database not only for certain table, to decide if it exexceeds 30% to re-build index or re-organise.

2-what is the relationship between re-build or re-organise index by log file.

Thanks lot
Sean Lange
Sean Lange
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zi (12/26/2012)
Dear Friends

1-1-How to know the fragmentation size for whole database not only for certain table, to decide if it exexceeds 30% to re-build index or re-organise.

2-what is the relationship between re-build or re-organise index by log file.

Thanks lot


1) Fragmentation for the database as whole doesn't make sense in this context. You need to look at each index individually.

2) I don't understand your question here. What do you mean?

You should probably do a google search for "sql server rebuild vs reorganize index" and be prepared to spend some time reading.

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zi (12/26/2012)
1-1-How to know the fragmentation size for whole database not only for certain table, to decide if it exexceeds 30% to re-build index or re-organise.


Databases don't have fragmentation. Indexes do. Talking about the fragmentation level of an entire DB is completely meaningless.


Gail Shaw
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zi
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Thanks for replying

- what if I have a huge database = 'Tables' , how to know that I need to re-organise or to re-build indexes

-why when re-organise or re-build indexes make log file bigger.

Thanks lot
GilaMonster
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zi (12/26/2012)
- what if I have a huge database = 'Tables' , how to know that I need to re-organise or to re-build indexes


Then you look at the fragmentation of the indexes and decide which to rebuild. I recommend you use something like Ola's scripts
http://ola.hallengren.com/Versions.html

-why when re-organise or re-build indexes make log file bigger.


Because all modifications to the DB are logged and both index rebuilds and reorganise operations do a substantial amount of modifications


Gail Shaw
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zi
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Thank you very much
Jeff Moden
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zi (12/26/2012)
Dear Friends

1-1-How to know the fragmentation size for whole database not only for certain table, to decide if it exexceeds 30% to re-build index or re-organise.

2-what is the relationship between re-build or re-organise index by log file.

Thanks lot


These are actually interview questions.... important interview questions that every DBA should know by heart. The fact that you're posting these questions means you really need to spend some time practicing being a DBA before you answer another ad for the position. And, no... I'm not trying to be mean here. Call it "tough love" for someone looking for a job as a DBA. Buy yourself a copy of the SQL Server Develop Edition, install it on your laptop or home computer, and hit the books.

You might also want to learn how to Google for such answers instead of relying on the kindness of others who might not actually know the answers to your questions. ;-)

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Here is an excellent difference between rebuilding the indexes & reorganising the indexes

Eg.
Index Rebuild : This process drops the existing Index and Recreates the index.
USE AdventureWorks;
GO
ALTER INDEX ALL ON Production.Product REBUILD
GO

Index Reorganize : This process physically reorganizes the leaf nodes of the index.
USE AdventureWorks;
GO
ALTER INDEX ALL ON Production.Product REORGANIZE
GO

Note: Index should be rebuild when index fragmentation is great than 40%. Index should be reorganized when index fragmentation is between 10% to 40%. Index rebuilding process uses more CPU and it locks the database resources. SQL Server development version and Enterprise version has option ONLINE, which can be turned on when Index is rebuilt. ONLINE option will keep index available during the rebuilding.
zi
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Thanks for replying

Do you have a script to know the fragmentation size for the whole database not only table by table.

Thanks lot
Lynn Pettis
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zi (12/30/2012)
Thanks for replying

Do you have a script to know the fragmentation size for the whole database not only table by table.

Thanks lot


To repeat:

GilaMonster (12/26/2012)
zi (12/26/2012)
1-1-How to know the fragmentation size for whole database not only for certain table, to decide if it exexceeds 30% to re-build index or re-organise.


Databases don't have fragmentation. Indexes do. Talking about the fragmentation level of an entire DB is completely meaningless.


Cool
Lynn Pettis

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