DMD to TXT Converter

DMD to TXT Conversion Explained

Converting an Oracle Data Modeler project (.DMD) to a plain text file (.TXT) changes a visual, multi-file database design into a single, readable text document. People perform this conversion to extract Data Definition Language (DDL) scripts, generate data dictionaries, or make database schemas searchable without installing Oracle software.

You gain universal compatibility, easy version control, and fast text searching. However, you lose all visual Entity-Relationship Diagrams (ERDs), layout coordinates, and the interactive graphical interface. The main trade-off is sacrificing visual design for universal readability. If you need to edit the visual model later, converting to .TXT is a bad idea. You must keep the original .DMD file and its associated data folder.

Typical Tasks and Users

• Database Administrators (DBAs): Exporting DDL scripts from a .DMD project to run in SQL*Plus or share with developers as a text file.
• Software Engineers: Converting data models to text to track schema changes line-by-line in version control systems like Git.
• Technical Writers: Generating plain text data dictionaries to include in system documentation.
• System Architects: Reviewing table structures, data types, and constraints quickly without launching heavy database modeling software.

Software & Tool Support

• Oracle SQL Developer Data Modeler: The official, free tool from Oracle. It opens .DMD files and exports the models to DDL (text) or CSV/TXT reports.
• Text Editors: Applications like Notepad++, Visual Studio Code, or Vim can open the raw .DMD file (which is formatted as XML) and the resulting .TXT files.
• Convert.Guru: A web-based tool that extracts text and schema definitions from .DMD files without requiring local Oracle installations.
• Command-Line Tools: Utilities like grep or awk can parse the raw XML inside the .DMD file and its associated directory structure to extract specific text strings.

Pros and Cons of the Conversion

Pros:

• Compatibility: A .TXT file opens on any operating system, device, or basic text editor.
• Version Control: Plain text is ideal for Git diffs. Tracking changes in a complex .DMD directory structure is noisy and difficult to read.
• File Size: Extracted text or DDL is significantly smaller than the full Oracle model directory.

Cons:

• Fidelity Loss: All visual ERD layouts, colors, and diagram coordinates are permanently lost.
• One-Way Street: You cannot easily convert a plain .TXT file back into a fully structured .DMD visual model.
• Structural Complexity: A .DMD file relies on a companion folder (e.g., model_name/). If you only convert the root .DMD file, you miss the actual table definitions stored in the subfolders.

Conversion Difficulties & Why Convert.Guru

The biggest technical problem in this conversion is that a .DMD file is not a standalone file. It is an XML pointer to a complex directory structure containing logical, relational, and physical models. Converting it requires parsing multiple XML files across subdirectories, resolving internal references, and formatting them into a readable text output. Simply renaming the file extension to .TXT only reveals the root XML metadata, not the actual database schema.

Convert.Guru handles this complex parsing pipeline automatically. It reads the .DMD structure, extracts the relevant schema definitions, and outputs a clean, consolidated .TXT file. It eliminates the need to install Oracle SQL Developer Data Modeler just to read a schema, providing an accurate text extraction without exaggerated claims of retaining visual data.

DMD vs. TXT: What is the better choice?

Which format should you choose?

Choose .DMD when you are actively designing, modifying, or visualizing a database schema. It is the only format that retains the relational diagrams and full Oracle metadata.

Choose .TXT when you need to share the schema with someone who does not have Oracle tools, when you want to execute the DDL scripts, or when you need to track schema changes in Git.

Avoid this conversion if you plan to continue editing the visual layout. Always keep the original .DMD project intact as your source of truth.

Conclusion

Converting .DMD to .TXT makes sense for extracting DDL scripts, generating data dictionaries, and sharing database schemas universally. The biggest limitation to watch for is the complete loss of visual Entity-Relationship Diagrams and the inability to reverse the conversion back into a working Oracle project. Convert.Guru provides a reliable, fast way to extract this text data without requiring heavy Oracle software, making it a practical choice for quick schema reviews and text extraction.