Go Premium for a chance to win a PS4. Enter to Win

x
?
Solved

Updating SQL partition schemes & partition functions

Posted on 2010-11-16
6
Medium Priority
?
722 Views
Last Modified: 2012-05-10
My client's IT dept had set up SQL Server 2005 filegroups on a particular database for each fiscal quarter: fg2006Q4, fg2007Q1, fg2007Q2, ... up to fg2010Q4. I noticed today that the fg2010Qx files had not been used, still at 1MB each.

Upon further digging, I found the Partition Schemes and Partition Functions folders in Mgmt Studio.

One Scheme: CREATE PARTITION SCHEME [psEvent] AS PARTITION [pfEvent] TO ([fg2006Q4], [fg2007Q1], [fg2007Q2], [fg2007Q3], [fg2007Q4], [fg2008Q1], [fg2008Q2], [fg2008Q3], [fg2008Q4], [fg2009Q1], [fg2009Q2], [fg2009Q3], [fg2009Q4])

Corresponding Function: CREATE PARTITION FUNCTION [pfEvent](int) AS RANGE RIGHT FOR VALUES (1000300, 5493523, 25712235, 45243827, 67741212, 88804361, 106935897, 121343754, 122508529, 122512053, 139523161, 154878083)

Q1: I'd like to create filegroups for fg2011Qx... then can I simply ALTER PARTITION SCHEME with fg2010Q1 through fg2011Q4 added to the list?

Q2: I believe I understand the function ranges, but wondering where/how these ID's would have been generated (likely)? And more fundamentally, how would SQL know when to move onto the next filegroup (assuming it had existed when needed)?

Q3: Is there a safe & easy way to "re-balance" the filegroups... so that fg2010Qx's are used, and the fg2009Q4's aren't so big. I suppose not a huge deal if not, but it'd look cleaner if so.

Thanks,
Jeff
0
Comment
Question by:jdallen75
  • 3
  • 3
6 Comments
 
LVL 9

Expert Comment

by:Sander Stad
ID: 34153577
You can add an additional filegroup to the scheme with the following command:

ALTER PARTITION SCHEME psEvent
NEXT USED fg2011Qx;
GO

Than you can use the following script to alter the partition function:

IF EXISTS (SELECT * FROM sys.partition_functions
    WHERE name = 'pfEevent')
DROP PARTITION FUNCTION pfEvent;
GO
CREATE PARTITION FUNCTION pfEevent (int)
AS RANGE RIGHT FOR VALUES  (1000300, 5493523, 25712235, 45243827, 67741212, 88804361, 106935897, 121343754, 122508529, 122512053, 139523161, 154878083, xxxxxxx);
GO
0
 
LVL 9

Accepted Solution

by:
Sander Stad earned 2000 total points
ID: 34153622
Q2:
The numbers in the function are not ID's but are the boundaries of rows. This website shows you what you want to know: http://msdn.microsoft.com/en-us/library/ms187802(v=SQL.90).aspx

Q3: What do you mean by rebalance the filegroups? Do you want to change the number of records that are saved in the different filegroups?
0
 

Author Comment

by:jdallen75
ID: 34154843
Sstad,

Q3: I mean that, for instance, the files in fg2009Q1, Q2, and Q3 each total 10GB. However, since fg2009Q4 was the last listed in the partition scheme, it has been used since that point in time, and is now 80GB. fg2010Qx files are basically empty because they have not been used this year.

Thanks on the other points - I will look into them.

JA
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 

Author Comment

by:jdallen75
ID: 34155331
I think I understand now... it looks as though the boundary values in the partition function list are SSID's of the rows in the tables. That part isn't all that intuitive, and more importantly does not cleanly divided up the data by calendar quarters. What seems to be cleaner would be to choose a datetime column from the table, and define its boundaries accordingly. "20090101, 20090401, 20090701..." is a heck of a lot clearer!
0
 
LVL 9

Expert Comment

by:Sander Stad
ID: 34157157
That could work but make sure your column is in date or int format because I don't know how it works with text in this case.
0
 

Author Comment

by:jdallen75
ID: 34158841
I discovered the common problem in that the partition column has to be part of the primary key, which in this case it isn't. There are a couple of workaround solutions, be we've decided in this case (since it is an archive DB), to go with one partition over several filegroups.

Thanks for your guidance.
JA
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

SQL Server engine let you use a Windows account or a SQL Server account to connect to a SQL Server instance. This can be configured immediatly during the SQL Server installation or after in the Server Authentication section in the Server properties …
How to leverage one TLS certificate to encrypt Microsoft SQL traffic and Remote Desktop Services, versus creating multiple tickets for the same server.
Exchange organizations may use the Journaling Agent of the Transport Service to archive messages going through Exchange. However, if the Transport Service is integrated with some email content management application (such as an anti-spam), the admin…
Please read the paragraph below before following the instructions in the video — there are important caveats in the paragraph that I did not mention in the video. If your PaperPort 12 or PaperPort 14 is failing to start, or crashing, or hanging, …

879 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question