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From Jan Horák <>
Subject Re: Repository structure
Date Tue, 09 Mar 2010 23:52:02 GMT
Sorry, the attachment forgotten :)

Dne 10.3.2010 00:50, Jan Horák napsal(a):
> Hi, after a long pause I started to analyze the SQL backend again. I'm 
> just studying the BDB and FSFS backends to collect all requirements 
> needed to design the SQL scheme.
> 1) I have already taken a look at the SVN source to find out, which 
> operations in the DAG (repository tree) are used mostly while an 
> ordinary checkout is performing (or generally while the repository is 
> reading). It seems like the most used operation is retrieving the 
> ancestors in the tree, while reading a subtree is not used so often, 
> am I right?
> 2) The aim of the second question is to imagine, how the repository 
> looks inside (in BDB backend for example). I've prepared very simple 
> snapshot (see the attachment, hope it will be attached) of the 
> repository objects after two simple commits.
>   * The first commit will add a directory '/b' and files 'a.txt' and 
> '/b/c.txt' to the root in an empty repository.
>   * The second commit will change the content of the file 'a.txt', add 
> a file 'd.txt' and rename the directory '/b' to '/bb'.
> The attached picture shows how I imagine the repository (very simple, 
> no copies and changes table, many attributes are not shown). If 
> anybody from developers has a second, please, could you take a look at 
> the picture, if there is not any critical mistake?
> Thanks for answers
> Jan Horak

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