R
Rishikesh Baidya
Author
August 10, 202310 min read
Development
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Database migrations are among the riskiest operations in software development. Done wrong, they can cause data loss or extended downtime. As CTO of Softechinfra, I've led dozens of production migrations. Here's how to do them right.
Zero
Downtime Possible
100%
Data Integrity
3x
Time Buffer Needed
∞
Test Runs Required
Planning Your Migration
Assessment Phase
Understand your current state:
- Schema complexity
- Data volume
- Current performance
- Dependencies
Migration Strategies
Big Bang
All at once, requires downtime, simpler but higher risk
Phased Migration
Incremental approach, reduced risk, more complex
Parallel Running
Both systems operate, sync data, allows comparison
CDC-Based
Change Data Capture for continuous sync during migration
Technical Approaches
Schema Migrations
💡 Safe Patterns: Add columns with defaults, never remove columns immediately, use online DDL when available, and always test on production copies first.
⚠️ Risky Patterns: Renaming columns directly, changing types without care, large table alterations during peak hours, and dropping constraints without validation.
Data Migration Tools
ETL tools and approaches our development team uses:
- Database-native tools (pg_dump, mysqldump)
- AWS DMS, Azure DMS
- Custom scripts for complex transformations
- Debezium for CDC
"The best migration is one you've rehearsed so many times it becomes boring. Practice on production-like data until you can do it blindfolded."
Risk Mitigation
Backups
- Full backup before starting
- Tested restore procedure
- Point-in-time recovery option
- Off-site copies
Rollback Plan
- Document rollback steps
- Test rollback procedure
- Define triggers
- Time limits
Common Pitfalls
- Insufficient testing - Always test with real data volumes
- Underestimating time - Add 3x buffer to estimates
- Ignoring dependencies - Map all connected systems
- Poor communication - Keep stakeholders informed
- No rollback plan - Always have an exit strategy
For more on infrastructure, read our Serverless Architecture Guide.
Planning a Database Migration?
Our team has safely migrated databases of all sizes, from startups to enterprise. From schema design to production cutover, we ensure zero data loss.
Get Free Consultation →See our database work in Radiant Finance and MereKisan projects.
Tags:
DatabaseMigrationDevOpsBest PracticesPostgreSQL