This is probably a topic for another forum. If I am saving the contents of a file within a database and saving/updating the file to svn how can I garruntee atomicity? For instance I am parsing a file and storing the contents in a database and then saving the file in svn/cvs. By storing the contents in the database I can search and perform calculations on the contents. Also, by saving the file in svn I have the orginal data which I can retrieve later for viewing through other programs.
So, in this example how can I garunttee that when the data is inserted/updated in the database is an atomic transaction with saving the file to svn. I know I could rollback the database transaction back if there is an error saving to svn. What if ... there are multiple users saving the same file?

user A commits changes to the database
user B commits changes to the database
user B saves the file
user A saves the file

even if this is within a small block of code the such as...

{
//save to database
//save file
//commit database changes
}

so now the database is out of sync with the latest file within svn.
Again this might be a question suited for another forum, and advice is approciated even you tell me another forum to post on ;)