I have a database on SQL server 2008 express with aprox 30 tables and many more relationships than that. I had a database diagram showing all the relationships between the tables which was very useful. However it has completely vanished. All the data and tables is there, but the diagram has simply vanished. This has happened once before, although at a much earlier stage of the database’ development, so I simply redesigned the diagram. But I am loathed to do so again.
Has anyone any clues whatsoever as to how this can happen?
I had run a script to clear the test data from the tables, which it seems also deletes all system diagrams – so it was self inflicted 🙁