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Does Design History really increase the file size two-fold

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Original Tip Date: Jul 9, 2007

Does Design History really increase the file size two-fold?
  
Keith Bentley provides this excellent explanation:

Suppose you take a 500K file and enable Design History. Your file will immediately double in size
for the first commit, since your file now will have two copies of every element: the live state and the history state. At this point your file is 1MB. Now let's say you edit the file and modify 10 elements and perform a Design History commit. The new file will be 1MB + 10 elements which might add up to 1.01MB.

As a general rule of thumb, enabling Design
History will increase your disk size of your DGN's by a factor of 2.5. Note that 2.0 is a minimum since each element is always stored at least twice; once in the live state once in the history state. The 0.5 is an average amount of "churn" over an average project lifecycle.

 

AskInga Tip #726

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