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HomeHomeArchived Discus...Archived Discus...Developing Under Previous Versions of .NETDeveloping Under Previous Versions of .NETASP.Net 2.0ASP.Net 2.0Storing vs Calculating dataStoring vs Calculating data
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12/19/2007 8:01 PM
 
John

Joined: 1/10/2006
Posts: 75

Hi,

 I'm in the process of creating a database table and was wondering if it's better to store calculated values or recalculate them each time. So for example, I am creating a table that stores articles and then a table to store the pages to the article. If a new page is added should I update the pages field in the articles table or should I calculate the number of pages for an article when it's queried?

 

Thanks,
John
 
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12/20/2007 12:00 AM
 
Jordan Widstrom


Joined: 11/17/2005
Posts: 13

This sounds like a general programming/database design question rather than a DNN-related question, but I think you will be better off calculating at query time in your scenario. If you have a separate pages field, you are tasked with keeping it up to date, and it's possible, just by having a separate field, that it may not stay current/accurate. Counting the number of pages is also probably a pretty inexpensive calculation.

There are times, though that storing a calculated field may be preferrable. If the calculation (or associated data retreval) is expensive, and/or it is queried often.

- Jordan
 
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12/26/2007 3:51 PM
 
Ross Nornes

Joined: 11/20/2006
Posts: 9

I would tend to agree with Jordan Widstrom. My general rule of thumb is trying to measure the amount of processing it takes to calculate the value. If the calculation is super intensive and very time consuming, personally I would calc it and store it, but if it’s a very simple operation, just perform the calculation only.
 
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