More organizations are choosing to migrate their business systems to PostgreSQL, Because this open-source database offers high stability, scalability, and a mature ecosystem, making it a cost-effective foundation for innovation. Whether searching for a migrate MySQL to PostgreSQL tool or a SQL Server to PostgreSQL migration tool, businesses need reliable and controlled solutions to ensure data integrity and operational continuity. Database migration requires considering factors such as source database type, acceptable downtime, data structure complexity, and future hybrid cloud deployment. Selecting the right database migration tools ensures maximum migration success.
Popular PostgreSQL Migration Tools in 2025 [Open Source]
In enterprise PostgreSQL migration projects, choosing the right tool is critical. Below are several widely used solutions, covering migrations from MySQL, SQL Server, Oracle, and more. Each tool has unique advantages, suitable for different team sizes and technical backgrounds.
Option 1. pgLoader
pgLoader is an open-source tool designed to migrate databases such as MySQL, SQLite, and MS SQL Server to PostgreSQL. It supports bulk data loading and, in some cases, incremental migration, ideal for projects needing fast data transfer.
Key Features:
- Supports multiple source databases (MySQL, SQLite, SQL Server)
- Automatic schema and data type conversion
- High-speed bulk loading
- Partial incremental migration support
- Requires command-line and scripting skills
Option 2. Ora2Pg
Ora2Pg is an open-source tool focused on migrating Oracle databases to PostgreSQL. It can automatically convert Oracle PL/SQL to PostgreSQL equivalents, suitable for complex enterprise databases.
Key Features:
- Automatic conversion of Oracle schemas, tables, and stored procedures
- Supports full data migration
- Generates reports to assess migration complexity
- Ideal for large-scale and complex architectures
- Does not support real-time migration
Option 3. Flyway
Flyway is a database version control and migration tool supporting PostgreSQL, MySQL, SQL Server, and more. It focuses on schema changes and version management rather than bulk one-time data migration.
Key Features:
- Supports SQL and Java-based migration scripts
- Continuous integration and version control
- Suitable for DevOps teams managing database changes
- Handles incremental schema updates
- Not designed for real-time data migration
Option 4. pg_chameleon
pg_chameleon is an open-source tool primarily used to migrate MySQL to PostgreSQL. It supports real-time incremental synchronization, ideal for scenarios requiring minimal downtime.
Key Features:
- Full and incremental MySQL to PostgreSQL migration
- Real-time replication to reduce downtime risk
- Automatic table structure and index mapping
- Supports distributed deployment
- Provides logging and monitoring for operational management
|
Tool Name |
Source DB Support |
Real-Time Support |
Key Features Summary |
Technical Requirements |
Open Source / Commercial |
|
pgLoader |
MySQL, SQLite, SQL Server |
Partial |
High-speed bulk loading, schema/type conversion, partial incremental |
CLI, scripting |
Open Source |
|
Ora2Pg |
Oracle |
No |
PL/SQL conversion, schema migration, full data migration |
DB expertise |
Open Source |
|
Flyway |
PostgreSQL, MySQL, SQL Server |
No |
Version control, SQL/Java migration scripts, CI/CD integration |
DevOps skills |
Open Source + Commercial |
|
pg_chameleon |
MySQL |
Yes |
Full & incremental migration, real-time sync, distributed deployment |
Python, CLI |
Open Source |
i2Stream – Enterprise-Grade PostgreSQL Migration Tool
While open-source tools remain focused on specific database pairs or one-off migration tasks, i2Stream delivers unified support for complex hybrid cloud architectures and real-time data strategies within enterprises.
i2Stream redefines enterprise-grade data continuity solutions. It transcends traditional migration tools by building bidirectional data links across heterogeneous environments within complex hybrid IT architectures, providing a powerful, secure, and reliable real-time data flow solution for the entire data domain.
- Exceptional Heterogeneous Compatibility:It supports real-time synchronization from over 30 homogeneous and heterogeneous data sources to PostgreSQL and a wide range of other targets. Its extensive coverage includes legacy databases like Oracle, SQL Server, and MySQL, as well as modern systems like Kafka, Hadoop ecosystems (Hive, HBase). This enables truly seamless data flow across different platforms, versions, and character sets.
- Enterprise-Grade Reliability & Data Safety:The platform provides integrated real-time synchronization of DDL and DML, ensuring schema and data remain highly consistent between source and target. Its graphical logic delete blocking feature prevents accidental data loss. The powerful Data Comparison and Repair tool offers a double safeguard for data integrity by performing online difference checks and enabling automatic remediation.
- Comprehensive Observability & Intelligent Operations:Through a fully graphical interface, administrators gain centralized control over all synchronization tasks. The system supports latency alerts with second-level granularity and provides real-time monitoring and threshold-based alerts for host resource utilization (CPU, Memory, Disk). Furthermore, the automated task inspection feature proactively generates health reports for streamlined operations.
- Flexible Deployment & High Performance:i2Stream supports various deployment models (agent-based/agentless) and adapts to complex environments, including RAC, clusters, and distributed architectures. Its high performance is demonstrated by multi-threaded parallelism for both full and incremental synchronization, coupled with data compression and traffic control capabilities, ensuring efficient data transfer while maintaining business continuity.
- Advanced Data Management Capabilities:The platform includes built-in ETL functionalities such as data filtering, field concatenation, and automatic conflict resolution. Unique features like Sequence Calibration and LOB Field Completion guarantee data accuracy and integrity in complex scenarios. Additionally, support for bidirectional replication and breakpoint resumption lays a solid foundation for building active-active, parallel run, and disaster recovery architectures.
Conclusion
In summary, open-source tools offer a diverse set of options for PostgreSQL migration. They are well-suited for projects with limited budgets, strong technical expertise, and relatively straightforward scenarios.
However, for modern enterprises that demand zero-downtime, absolute data safety and consistency, and seamless integration across complex, heterogeneous environments, these tools often only solve part of the migration challenge. This is precisely where i2Stream emerges as a strategic solution. It is more than just a migration tool; it is a real-time data movement platform that supports broader enterprise data strategies. It elevates data migration from a high-risk, isolated project to a manageable, observable, and scalable continuous operation, laying a solid and reliable foundation for building a future-proof data architecture.
Therefore, your choice ultimately depends on your business complexity and continuity requirements. If you are planning a critical migration for your core business operations, the enterprise-grade capabilities, comprehensive safeguards, and professional support offered by i2Stream represent the most secure path to ensuring the success of this strategic investment.