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HomeHomeOur CommunityOur CommunityGeneral Discuss...General Discuss...Database Optimization and GUIDsDatabase Optimization and GUIDs
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7/16/2007 11:21 PM
 
Mike Lawell

Joined: 11/29/2003
Posts: 18

This issue has been around for awhile...  I am a 11 year senior SQL Server Database Developer/DBA. Why is the GUID used so widely in DotNetNuke as the Primary Key (usually clustered)???

Did you know that a clustered index is basically a re-sort of the database? That basically means that using the GUID, a random "number", re-sorts the table EVERY time a new record is added.  Do you know that the more records you get in a table... (example the EventLog) ... the more performance is adversly affected.

Can we please change this in future versions (I know it'll take time and multiple versions to complete)??
 
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7/17/2007 2:37 AM
 
Sebastian Leupold


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Sebastian Leupold's Avatar

www.dnnwerk.de
Joined: 3/8/2004
Posts: 46212

which tables are you referring to? AFAIK GUIDs are rarely used in DotNetNuke, only by Microsoft membership ASPNET tables (an external component, we don't touch) and as additional portal identifier (not indexed). Most tables use autoincrement integers as key.

Cheers from Germany,
Sebastian Leupold

dnnWerk - The DotNetNuke Experts   German Spoken DotNetNuke User Group

Speed up your DNN Websites with TurboDNN
 
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7/18/2007 10:17 PM
 
Mike Lawell

Joined: 11/29/2003
Posts: 18

You are right, most of them are int datatype, the Event Log though, does use a GUID stored as a varchar(36)... this one is a critical table and suffers from it.

Of course I'd never touch the ASPNET tables... they're betting that there won't be that many users being added on a regular basis... but I guess they were wrong. SQL Server 2005 has a new guid function that creates the GUIDs in sequence...

NEWSEQUENTIALID ( )
(at some point DotNetNuke will have to require SQL 2005 as the minimum requirement.)
 
 
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