erd

I need to create an ERD for an ADS 10 database. Reverese Engineering would be nice, since the database already exists. Unfortunately, I didn't found a ERD-Tool which supports this database. Does anybody knows a tool which supports this features? You can use the Advantage Data Architect to get a model of a database. As far as I know this only works on data dictionaries, but you can easily add free tables to a dictionary if necessary. I don't know of any other ADS compatible modelling tools. It may be worth your while to take a look at TOAD Data Modeler by Quest Software. TDM Version 2

In every tutorial on entity relationship diagrams, I read that specifying a fixed cardinality for a relationship is not allowed. Only an informal comment on the ERD may clarify that the number of pilots is exactly 2 . So, for example, a relationship between flights and pilots where each flight has exactly 2 pilots present, would have to be represented as: <flight> 0..N <------> 1..N <pilot> rather than <flight> 0..N <------> 2 <pilot> My notation is 0..N = optional, many; 1..N = mandatory, many, 1 = mandatory, one. Is this restriction universal? What's the reason behind it? EDIT: clarified my

I have a rake task that creates diagrams: task :diagram do `rake erd filetype=dot disconnected=true` end The execution of this task is quite slow and I guess it is because in the nested rake-invoke statement the whole rails environment is loaded again. I wanted to use Rake::Task['...'].invoke instead. But the erd task has some non-rake arguements ( filetype=dot etc.), which don't seem to work with the invoke method. Is there a way to pass those arguments to rake so that I can use the proper rake invoke syntax. Try setting the ENV variables in your code: task :diagram do ENV['filetype']='dot'