I've imported a very large data model (1082 entities, 2395 relationships) from PowerDesigner, and the Main Model diagram is pointless. The submodel diagrams are the ones I expect people to focus their attention on.
The model takes longer than I would like to open and close, and I have to be careful when I select an entity in the browser (it automatically shows me where it is in the diagram, - it takes 2-3 seconds each time, which is annoying), so I thought maybe I could improve performance by deleting all the symbols on the main diagram. I'm only able to delete the entity, not the symbols.
Is there something I've missed?
You will get better performance if you change the zoom level for the Main Model to 100%. You can use the Overview window to see where the object is in the diagram when you select it.
The original PowerDesigner models doesn't have any entities on the Main Diagram - it only contains links to the top-level Packages (equivalent to submodels in ER/Studio).
The import created a diagram that contains everything in random places (including a big stack of entities in the top-left corner), so being able to see the part of the diagram that contains the entity is a complete waste of time.
Hmm, can I change the default behaviour, so ER/Studio doesn't mess about with the diagram view just because I've selected an entity in the browser?
In ER Studio, the Main Model contains everything. Submodels are basically just customized views of the Main Model. For large diagrams, as you've noted this makes the Main Model useless, but if you remove objects from it, you are removing them from the Submodels as well. Best thing is to avoid using the Main Model at all for large diagrams if possible and stick to the Submodels. If that's not possible, than set your view to 100% and find your object in the navigation pane on the left. The screen will be much more responsive.
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