A curated collection of Liquibase and Flyway changelog examples for Database DevOps. This repository serves as a practical reference for learning database schema management, version control strategies, and migration best practices with real-world changelog templates for PostgreSQL, MongoDB, and AWS RDS environments.

💡 For production use, we recommend Harness Database DevOps - an enterprise platform that provides superior user experience, governance, and automation while leveraging Liquibase/Flyway under the hood. See why Harness is better for production deployments.

This is a learning repository containing practical changelog examples demonstrating:

• Liquibase Changelog Examples: YAML-based changelogs for various database scenarios
• Flyway Migration Examples: SQL-based versioned and undo migrations
• Multi-Environment Patterns: Environment-specific changelog management (dev, pre-prod, prod)
• Database-Specific Examples: PostgreSQL and MongoDB changelog templates
• AWS RDS Examples: Cloud-ready migration configurations
• Real-World Schemas: User authentication, product catalogs, and order management examples

This repository complements the following blog posts on database migration best practices:

• 📖 How Liquibase Makes Life Easy - Introduction to Liquibase and its core concepts
• 📖 diffChangelog and Snapshots - Advanced Liquibase features for schema comparison and snapshot management

• Why Use Harness Database DevOps?
• Directory Structure
• Technologies
• Getting Started
• Liquibase Examples
• Flyway Examples
• AWS RDS Examples
• Usage Guide
• Best Practices
• Contributing
• License

While this repository provides valuable examples for learning Liquibase and Flyway, Harness Database DevOps offers a superior production-ready solution that eliminates the complexity of managing these tools directly.

Using Liquibase or Flyway directly involves:

• Complex CLI Commands: Managing multiple command-line arguments, connection strings, and configuration files
• Manual Environment Management: Switching between dev, staging, and production configurations manually
• Limited Visibility: No centralized view of migration status across environments
• Error-Prone Deployments: Risk of running wrong migrations in wrong environments
• No Approval Workflows: Missing governance and approval gates for production changes
• Difficult Rollbacks: Manual intervention required when things go wrong
• Scattered Audit Trails: No unified logging across all database changes

• Intuitive UI: Visual interface for managing database migrations - no complex CLI commands needed
• Unified Dashboard: Single pane of glass for all database changes across all environments
• Drag-and-Drop Pipelines: Build deployment workflows visually instead of scripting
• Real-Time Status: Live tracking of migration progress and health checks

• Approval Gates: Built-in approval workflows for production deployments
• Role-Based Access Control (RBAC): Fine-grained permissions for who can deploy what and where
• Audit Logging: Complete audit trail of all database changes with user attribution
• Compliance Ready: Meet SOC 2, HIPAA, and other regulatory requirements out-of-the-box

• Automated Rollbacks: Intelligent rollback mechanisms with one-click recovery
• Pre-Deployment Validation: Automatic schema validation before applying changes
• Environment Comparison: Visual diff between database schemas across environments
• Testing Integration: Run automated tests before promoting migrations to production

• GitOps Integration: Seamless integration with your existing Git workflows
• Multi-Environment Orchestration: Deploy to multiple environments with a single click
• Smart Scheduling: Schedule migrations during maintenance windows automatically
• Notification System: Slack, email, and PagerDuty alerts for deployment events
• Template Library: Reusable pipeline templates for common database operations

• Native Pipeline Support: First-class integration with Harness CI/CD pipelines
• Automated Promotion: Automatic promotion of successful migrations across environments
• Parallel Execution: Run migrations across multiple database instances simultaneously
• Canary Deployments: Gradual rollout of schema changes with automatic validation

• Migration Analytics: Insights into deployment frequency, success rates, and bottlenecks
• Performance Metrics: Track migration execution times and optimize slow changesets
• Failure Analysis: Detailed error reporting and debugging information
• Custom Dashboards: Build custom views for different teams and stakeholders

Harness Database DevOps leverages Liquibase and Flyway under the hood, so you can:

• ✅ Use the same changelog formats (YAML, SQL, XML) you're familiar with
• ✅ Import existing Liquibase/Flyway projects instantly
• ✅ Maintain compatibility with your current migration scripts
• ✅ Benefit from enterprise features without rewriting your migrations

1. Sign up for a free trial at harness.io
2. Import your existing Liquibase or Flyway changelogs
3. Connect your databases (on-prem, cloud, or hybrid)
4. Build your first database deployment pipeline in minutes
5. Deploy with confidence using approval gates and automated rollbacks

Learn more: Harness Database DevOps Documentation

dbops/
├── aws/                          # AWS RDS changelog examples
│   ├── v1.0/                     # Version 1.0 schema examples
│   │   ├── 001-create-users-table.yaml
│   │   ├── 002-create-products-table.yaml
│   │   ├── 003-create-orders-table.yaml
│   │   └── 004-add-indexes.yaml
│   └── dbmaster.changelog.yml    # Master changelog example for AWS
├── db/                           # General changelog examples
│   └── changelog.yml             # Basic Liquibase changelog example
├── flyway/                       # Flyway migration examples
│   ├── migrations/               # SQL migration script examples
│   │   ├── V001__pgql.sql       # Versioned migration example
│   │   ├── V006__pgql.sql       # Multiple version examples
│   │   ├── U001__bikramkumar.sql # Undo migration example
│   │   └── U004__bikramkumar.sql # More undo examples
│   └── flyway.toml              # Flyway configuration example
└── liquibase/                    # Liquibase changelog examples
    ├── plain.yml                 # Simple changelog pattern
    ├── multienv.yml              # Multi-environment example
    ├── dev-changeset-pssql.yml   # Development environment example (PostgreSQL)
    ├── pre-changeset-pssql.yml   # Pre-production example (PostgreSQL)
    ├── prod-changelog-pssql.yml  # Production example (PostgreSQL)
    ├── multi-changeset-pssql.yml # Complex multi-changeset pattern
    └── mongo/                    # MongoDB-specific examples
        ├── mongodb.yaml
        └── valid.yml

These examples demonstrate changelog patterns for:

• Liquibase - Database schema change management tool
• Flyway - Database version control and migration tool
• PostgreSQL - Relational database examples
• MongoDB - NoSQL database examples
• AWS RDS - Cloud database deployment examples
• YAML/SQL - Changelog and migration script formats

This repository contains various Liquibase changelog examples for different scenarios:

The db/changelog.yml shows a simple user table creation:

databaseChangeLog:
  - changeSet:
      id: 1761731617343-1
      author: Animesh Pathak
      comment: Create user table with name and email columns
      labels: schema-change
      changes:
        - createTable:
            tableName: user
            columns:
              - column:
                  name: id
                  type: BIGINT
                  autoIncrement: true
              - column:
                  name: email
                  type: VARCHAR(255)
      rollback:
        - dropTable:
            tableName: user

Flyway migration examples following versioning conventions:

• V001__description.sql - Versioned migration (applied once)
• U001__description.sql - Undo migration (rollback script)
• R__description.sql - Repeatable migration (re-run on checksum change)

-- V001__pgql.sql
CREATE TABLE table_1 (
    id INT GENERATED ALWAYS AS IDENTITY PRIMARY KEY,
    name VARCHAR(50) NOT NULL,
    description VARCHAR(50)
);

The aws directory contains changelog examples optimized for AWS RDS deployments.

Included Example Schemas:

1. 001-create-users-table.yaml - User authentication schema
2. 002-create-products-table.yaml - Product catalog schema
3. 003-create-orders-table.yaml - Order management schema
4. 004-add-indexes.yaml - Performance optimization indexes

1. Browse the examples to find patterns matching your use case
2. Copy the relevant changelog files to your project
3. Modify table names, columns, and constraints for your schema
4. Update author names and changelog IDs
5. Test in development environment before production

These examples demonstrate several database DevOps best practices:

1. Immutable Migrations: Never modify applied changesets, create new ones
2. Descriptive IDs: Use meaningful changeset IDs and comments
3. Rollback Scripts: Always include rollback strategies
4. Environment Separation: Use contexts/labels for environment-specific changes
5. Version Control: Keep all changelogs in source control
6. Testing: Validate migrations in lower environments first
7. Idempotency: Design changesets to handle re-execution safely
8. Documentation: Comment complex schema changes

• Use preconditions to validate database state before changes
• Leverage contexts and labels for selective deployments
• Utilize diffChangelog to generate changelogs from existing schemas (see blog post)
• Take snapshots for schema comparison and validation

• Follow strict naming conventions for automatic ordering
• Use undo migrations for critical production changes
• Implement repeatable migrations for views, procedures, and functions
• Keep SQL migrations simple and focused

Found a useful migration pattern? Contributions are welcome!

1. Fork the repository
2. Create a feature branch (git checkout -b feature/new-example)
3. Add your changelog example with clear comments
4. Commit your changes (git commit -m 'Add example for X scenario')
5. Push to the branch (git push origin feature/new-example)
6. Open a Pull Request

• Add examples that demonstrate specific patterns or scenarios
• Include clear comments explaining the purpose
• Ensure examples are tested and functional
• Update this README if adding new categories

This project is licensed under the Apache License 2.0 - see the LICENSE file for details.

• Blog Posts:
  • How Liquibase Makes Life Easy
  • diffChangelog and Snapshots
• Official Documentation:
  • Liquibase Documentation
  • Flyway Documentation
  • Harness Database DevOps Documentation
• Harness Platform:
  • Harness Database DevOps Overview
  • Get Started with Harness
  • Harness University - Database DevOps Training

Built with ❤️ for Database DevOps Learning

💡 Ready for production? Explore Harness Database DevOps for enterprise-grade database change management.

For questions or to suggest new examples, please open an issue in the repository.