Generate PostgreSQL Test Data

In the realm of database development, the significance of realistic test data cannot be overstated. It serves as the backbone for rigorous testing, ensuring the robustness and reliability of the database system. One powerful tool that simplifies the process of generating such data is the dbForge Data Generator for PostgreSQL. This tool is designed to create massive volumes of meaningful and realistic test data, catering to a wide array of PostgreSQL data types. With its user-friendly interface and customizable configuration options, dbForge Data Generator transforms the often tedious task of data generation into a streamlined and efficient process.

Understanding the Need for Test Data

Testing plays a pivotal role in database development, acting as the gatekeeper that ensures the integrity, performance, and reliability of the system. It involves putting the database under conditions that closely mimic real-world scenarios to identify potential flaws and vulnerabilities. This is where test data comes into play.

Test data serves as the raw material for this crucial process. It is used to simulate different situations, ranging from normal operation to edge cases and stress conditions. By using realistic test data, developers can gain insights into how the database would perform under various circumstances, thereby identifying potential issues before they manifest in a production environment.

Moreover, test data is instrumental in quality assurance. It allows developers to verify that the database behaves as expected, ensuring that all functionalities work correctly and efficiently. It also helps in validating data integrity rules, checking the effectiveness of security measures, and assessing the system’s performance under different loads. In essence, test data is the cornerstone of a comprehensive quality assurance strategy, enabling developers to deliver a robust and reliable database system.

Supported PostgreSQL Data Types

The dbForge Data Generator for PostgreSQL supports a wide array of data types, catering to the diverse needs of database testing. These include INTEGER, DECIMAL, NUMERIC, FLOAT, TIME, DATE, DATETIME, YEAR, CHAR, VARCHAR, BINARY, VARBINARY, BLOB, TEXT, ENUM, SET, JSON, and all spatial data types.

The importance of this diversity in data types cannot be overstated. Different data types represent different kinds of information, each with its own set of rules and constraints. By testing with a variety of data types, developers can ensure that the database can handle all kinds of data correctly and efficiently. This comprehensive approach to testing helps uncover potential issues related to data handling and storage, thereby contributing to the overall robustness and reliability of the database system.

Guide to Generating Test Data with Data Generator Tool in dbForge Studio for PostgreSQL

Generating test data using the Data Generator tool is a straightforward process. Here’s a step-by-step guide on how to do it:

  1. Start by selecting ‘New Data Generation’ from the ‘Tools’ menu.
  2. In the dialog box that appears, select the connection and database where you want to generate data from the dropdown list, then click ‘Next’.
  3. The ‘Options’ page allows you to set the parameters for data generation. You can choose the number of rows to populate, the time period for data generation, and whether to truncate data from the table before generation.

  1. You can also set the value distribution mode. Options include generating random values by timestamp or seed, or generating values sequentially.
  2. Under ‘Column properties’, you can specify whether the generated values should be unique, and the percentage of NULL and empty values to be generated.
  3. After setting your preferences, click ‘Open’ to launch the data generation project.
  4. In the project document, select the tables and columns to populate, and define the data generation settings for each column.
  5. Once you’re satisfied with your settings, click ‘Populate data to the target database’.

  1. In the ‘Data Population Wizard’ that opens, choose whether to open the data population script in the internal editor, save the script to a file, or execute the script against the database without reviewing it.

  1. On the ‘Options’ page, select the general data population options and click ‘Next’. You can save these options for future use or use the default settings of the tool.
  2. Optionally, you can add scripts to be executed before and/or after data population on the ‘Additional Scripts’ page.
  3. The ‘Summary’ page displays any error messages or warnings related to data generation.

  1. Finally, click ‘Generate’ to complete the process. This will populate your selected database with the test data based on your defined settings.

Ensuring Data Consistency Across Tables

Maintaining data consistency across tables is a crucial aspect of database testing. One key element in achieving this is the use of foreign keys. Foreign keys establish a link between data in two tables, ensuring that the relationships between them are preserved during data generation. This results in the creation of consistent and meaningful test data that accurately reflects real-world scenarios.

However, while generating test data, certain database elements like triggers and constraints can interfere with the process. Triggers are database operations that are automatically performed when certain events occur, while constraints are rules applied to columns in a table. These can sometimes conflict with the data being generated. To avoid this, dbForge Studio Data Generator allows you to disable triggers and constraints during data generation, ensuring a smooth and uninterrupted process.

Different Ways to Insert Random Data

The Data Generator in dbForge Studio for PostgreSQL offers a variety of ways to insert random data into your database, providing flexibility to cater to different testing needs. This is achieved through various data distribution modes that allow you to fine-tune the generation process.

One option is to populate data by a specified number of rows. This mode allows you to set a fixed number of rows to be populated with random data. Alternatively, you can choose to generate data by time, specifying a time period during which data will be generated for each table.

Another approach is to use a linked table for data generation. This mode populates tables that already contain some data, ensuring that the new data is consistent with the existing data.

You can also populate tables by the percent proportion of existing data. This mode is useful when you want to increase the volume of your test data while maintaining the same distribution as your existing data.

These diverse options for generating random data provide a comprehensive toolset for creating realistic and meaningful test data, catering to a wide range of testing scenarios.

Real-time Preview of Test Data

The Data Generator tool offers a real-time preview feature that allows you to visualize the changes you make during the data generation process. This feature is presented in a preview pane at the bottom of the .dgen document, which displays tables and columns of the selected database for population.

As you adjust the generation settings for the selected tables or columns, the data in the Preview grid updates instantly. This immediate feedback is invaluable as it allows you to assess the impact of your changes on the fly, ensuring that the generated data aligns with your requirements.

However, in cases where the preview generation might be time-consuming, the tool provides an option to hide the Preview pane. This prevents the preview from refreshing with every change, allowing for a smoother configuration process.

The real-time preview feature underscores the importance of visual assessment in data generation. It provides a tangible representation of the generated data, enabling you to fine-tune the settings for optimal results. If you need to alter the Data Generator Properties, you can easily do so by clicking ‘Change data generation properties’ in the upper right corner of the project.


In conclusion, dbForge Studio for PostgreSQL is a powerful tool that significantly enhances the process of database development and testing. It offers a comprehensive suite of features designed to streamline the generation of realistic and meaningful test data.

Key features include support for a wide array of PostgreSQL data types, customizable data generators, and various data distribution modes. It also provides options for ensuring data consistency across tables and automating data generation tasks. The real-time preview feature allows for visual assessment of the generated data, enabling fine-tuning of the data generation settings.

dbForge Studio for PostgreSQL plays a crucial role in database development and testing by simplifying the creation of test data. It allows developers to simulate a variety of scenarios, thereby identifying potential issues before they manifest in a production environment. Moreover, it contributes to quality assurance by enabling thorough testing of database functionalities, data integrity rules, security measures, and performance under different loads.

In essence, dbForge Studio for PostgreSQL is an indispensable tool for any software development process involving a database, transforming the often tedious task of data generation into a streamlined and efficient process.

Leave a Reply