TDE and Tempdb

SQLServerCentral is supported by Red Gate Software Ltd.

Popular Topics

Home

Members

Calendar

Who's On

Home » Article Discussions » Article Discussions by Author » Discuss content posted by Jayakumar Krishnan » TDE and Tempdb

23 posts, Page 2 of 3

««1 2 3 »»

TDE and Tempdb

Rate Topic

Display Mode

Topic Options

Author

Message

Bradley Deem

Posted Tuesday, June 29, 2010 8:28 AM

Mr or Mrs. 500

Group: General Forum Members
Last Login: Friday, May 17, 2013 9:22 AM
Points: 551, Visits: 1,150

Thanks for the question, I needed to brush up on my TDE knowledge. Admittedly, the "great" caused me to pause, but I still got it right. As Hugo said yesterday, the QOTD is for learning not for points and for that I thank you.

Post #944711

Steve Jones - SSC Editor

Posted Tuesday, June 29, 2010 8:44 AM

SSC-Dedicated

Group: Administrators
Last Login: Yesterday @ 3:30 PM
Points: 31,436, Visits: 13,751

I have removed "great" from the question as it does depend. There is some performance impact, but how much is debatable.

Follow me on Twitter: @way0utwest

Forum Etiquette: How to post data/code on a forum to get the best help

Post #944720

Daniel Bowlin

Posted Tuesday, June 29, 2010 9:13 AM

SSCrazy

Group: General Forum Members
Last Login: Wednesday, May 22, 2013 1:10 PM
Points: 2,673, Visits: 2,418

Good question. I am glad the great was removed by the time I got to it.

Post #944742

SQLRNNR

Posted Tuesday, June 29, 2010 9:38 AM

SSCoach

Group: General Forum Members
Last Login: Yesterday @ 10:25 AM
Points: 18,754, Visits: 12,337

Thanks for the question.

As per the use of the term "Great" - it was gone by the time I answered but here is my 2 bits. The use of the word "great" most likely meant "significant." Granted that definition is also debatable since 3-5% may or may not be a significant amount depending on your environment.

Jason AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008

SQL RNNR

Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp

Post #944760

UMG Developer

Posted Tuesday, June 29, 2010 10:23 AM

SSCrazy

Group: General Forum Members
Last Login: Monday, May 13, 2013 11:21 AM
Points: 2,163, Visits: 2,148

Nice question, thanks!

I think little bits like this will help people learn and understand new features like TDE so they are better prepared when they actually need to use it.

Post #944809

Jayakumar Krishnan

Posted Tuesday, June 29, 2010 10:47 AM

SSC-Addicted

Group: General Forum Members
Last Login: Wednesday, May 22, 2013 5:52 PM
Points: 415, Visits: 738

Thanks for your comments and sorry for the confusion on the question, I took a negative meaning "great performance effect" as great performance degrade.

Thanks again for your comments...

Thanks
Jay
http://www.sqldbops.com

Post #944829

mattr-846241

Posted Tuesday, June 29, 2010 11:15 AM

Forum Newbie

Group: General Forum Members
Last Login: Tuesday, February 01, 2011 10:29 AM
Points: 4, Visits: 10

One way performance could be affected is if you use temporary tables. You may have a database which has a stored procedure which uses a temporary table.

I think there are other ways that a database will use the tempdb, but I don't know them offhand.

Cheers,
Matt

Post #944859

SQLBalls

Posted Tuesday, June 29, 2010 11:21 AM

Old Hand

Group: General Forum Members
Last Login: Tuesday, May 21, 2013 1:34 PM
Points: 385, Visits: 611

mattr-846241 (6/29/2010)

Hey Matt,
Your right Temp Tables as well as Table Variables, SQL Internal Work tables, the SQL version store, re-indexing jobs that specify sort in tempdb, and many other things are done within the Tempdb for not just TDE databases but for all databases, as well as for SQL internal processes.

Just to repeate though TDE uses the Windows API to encrypt the files on disk. Pages in memory are NOT encrypted, the TempDB files in memory would feel no ill effect from this if they have enough memory to opperate in.

This would effect a server during the checkpoint where all pages are flushed to the disk. Which once again depending on how the server is sized, the load in place, and the volume of users may make a little, a lot, or no difference whatsoever.

Hopefully this will get expanded by Microsoft or on some SQL blogs some where, as there is not a lot of documentation out there on this overall effect right now.

But you were right on in the suggestion that Temp tables could be effected but they would need to be so large that they spill onto the disk as if they are in the memory they should be unaffected.

Twitter: @SQLBalls
Blog: http://www.SQLBalls.com

Post #944866

Festeron

Posted Thursday, July 01, 2010 8:24 AM

SSC-Enthusiastic

Group: General Forum Members
Last Login: Friday, April 12, 2013 9:43 AM
Points: 142, Visits: 171

I'd be interested in your answer to these questions:

If you're using TDE in a production environment, what do you think you are protecting yourself from?

And are you using TDE on any laptop-based SQL Servers?

Post #946202

Steve Jones - SSC Editor

Posted Thursday, July 01, 2010 8:37 AM

SSC-Dedicated

Group: Administrators
Last Login: Yesterday @ 3:30 PM
Points: 31,436, Visits: 13,751

TDE protects from physical access to the files if SQL is down. If you detach/attach files, they are safe.

You can't run TDE on laptops practically. It's in Enterprise Edition only (a mistake, IMHO)

Follow me on Twitter: @way0utwest

Forum Etiquette: How to post data/code on a forum to get the best help

Post #946214

« Prev Topic | Next Topic »

23 posts, Page 2 of 3

««1 2 3 »»

Permissions