are you able to split up your design over several relational models? when you open a design, you can make a selection of the relational models being opened. You surely don't have to work on all tables of the design.
I can try
and I've 8GB of Ram on Win 7x64 Professional
You can give more memory to Data Modeler - you need to change in datamodeler64.conf
change 768 to 4000 or to value that works for you.
And of course you need to use 64 bit JDK.
In "save" operation DM also saves status of diagram (close/open). Keep the number of open diagram to minimum, avoid to keep main diagram open because rendering of diagram will slow load process.
And as Joop said you can try to split the model to smaller models.
But, can I get a similar achievement
making a subview for each area?
You can also make subviews, but since all objects are in one relational model, the loading time of the design is still long.
By splitting in relational models you can select during opening of the design which relational model(s) you want to open. Only these relational models will be opened, and this saves time!
But in this way i loose the check on ref constraint from tables of Model 1 and tables of model 2, or not?
And if I need make a working area (Subiew) with tabels of different Models, I can't made It, I'm wrong?
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You can refer to objects (tables and views) of different relational models of the same model by making a linked version of the object you want to use. You can achieve this by opening a subview on relational model A, and then drag an object of relational model B in the subview of A. As a result a linked object is created. You can recognize them by the chain symbol in the icon and the chain symbol in the object representation in the subview.
In this way you can also maintain the foreign keys between the tables.