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Looking for tools (windows platform) to genereate ER diagram (or similar) from an existing Oracle database.
Any good tools out there that are free to use or low cost?
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Power Architect is a GPL data modelling tool. See more here
SchemaCrawler for Oracle is a command-line tool that can generate database diagrams from an Oracle database. You can exclude tables and columns from the diagram using regular expressions. It is free and open-source.
SQL Developer is awesome. Supports all the databases and perfect for reverse engineering. It free and Java.
Its Free unlike other solutions listed above and it works, I just used it to reverse engineer a Postgres db!!!
Try out Oracle SQL Developer. It is from oracle and is going to be part of actual oracle installation from 11g onwards. It has a separate build modeler tool to engineer or re-engineer an ER model.
Other tool that may be useful that will help you more than just genereate ER diagram is SchemaSpy
You can use VISIO with an ODBC data source (oracle plugin) to generate ER diagrams - works well. From VISIO (Database Model Diagram, Reverse Engineer, select ODBC data source, username/password, select tables, generate).
Oracle Data Modeler. It's free, and seems to have many good features if you're willing to research it more in depth.