Tag: data modeling

Are Invisible Columns Really Invisible?

Today’s question: How are invisible columns treated with DESC, INFO and the GUI equivalent? Super quick, an INVISIBLE column is one that the user doesn’t see. They won’t be able to access it unless they know about it. Security by obscurity? No. Tom Kyte shows a few examples of the features usefulness, especially when adding […]

‘Modeling’ View Dependencies in SQL Developer Data Modeler

Today’s question: Please let me know how can I represent relation between view and base table in ER diagram created using sql datamodeler version4. So I know what the person is getting at here. They want to see the dependencies. Generally speaking, there are no actual relations between views and tables. Exception: you CAN define […]

Modeling Function Based Indexes in Oracle

@thatjeffsmith Is there a way to define a function-based index in #SQLDevModeler? — Kent Graziano (@KentGraziano) October 29, 2014 Function based indexes [DOCS] have been part of Oracle Database since at least version 8. Instead of just indexing someone’s name, you could also index the values returned by a function call over that name. Example […]

Data Modeling via Excel?

In SQL Developer if you use the Import Data feature from the main tree node, it will create a new table based on a delimited text or Excel file. We’ll look at the data and create some columns for you. In version 4.1, we’ll recognize numbers as numbers, dates as dates, and try to get […]

Viewing Complex Types in Oracle SQL Developer Data Modeler

Instead of having a column of type VARCHAR2 for a ‘Country,’ you might want to create an COUNTRIES type. Said COUNTRY would have an ID, NAME, and LOCATION. To make things even more fun, LOCATION would also be a custom type of LOCATIONS, having even more attributes/columns. To model these from scratch, you would build […]

My Favorite SQL Developer Data Modeler Features

I’m doing a talk on this very subject next week at ODTUG’s KScope14 conference, and I’ll put up the slides on Slideshare after the show, but I wanted to give a quick shout-out to the things you COULD Be using today to get the most out of your models and design experience. Search SubViews Reports […]

Configuring Memory Usage in Oracle SQL Developer

Sometimes you need more memory. Here’s an example: you want to model a database that has 1500 tables in it. What would that even look like? If you zoom out far enough… Now, ‘large’ is a subjective term. But lets put it this way – if you’re dealing with more than several hundred tables or […]

How to Preserve System Generated Constraint Names in Oracle SQL Developer Data Modeler

The risk of posting a question here, is that I might take it and turn it into a blog post. And that’s where today’s topic comes from. I imported data dictionary into SQL data modeler and cannot found out how to disable predefined constraint names. Table “T” was created in database without specifying primary key […]

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