7.4 KiB
7.4 KiB
Example: Phased Migration Diagram
Scenario
A user asks: "Create a diagram showing our database migration phases with current progress."
Generated Diagram
┌─────────────────────────────────────────────────────────────────────────┐
│ DATABASE MIGRATION: MONGODB TO POSTGRESQL │
│ Target: Q4 2025 Completion │
└─────────────────────────────────────────────────────────────────────────┘
PHASE 1: Schema Design & Setup ✓
┌─────────────────────────────────────────────────────────────────────────┐
│ Status: COMPLETE Duration: 2w │
├─────────────────────────────────────────────────────────────────────────┤
│ ✓ Analyze MongoDB collections and relationships │
│ ✓ Design PostgreSQL schema with proper normalization │
│ ✓ Create migration scripts and rollback procedures │
│ ✓ Set up staging environment with both databases │
└─────────────────────────────────────────────────────────────────────────┘
│
▼
PHASE 2: Dual-Write Implementation ✓
┌─────────────────────────────────────────────────────────────────────────┐
│ Status: COMPLETE Duration: 3w │
├─────────────────────────────────────────────────────────────────────────┤
│ ✓ Implement write-through to both MongoDB and PostgreSQL │
│ ✓ Add feature flags for gradual rollout │
│ ✓ Deploy to staging and validate data consistency │
│ ✓ Monitor for performance impact (< 50ms added latency) │
└─────────────────────────────────────────────────────────────────────────┘
│
▼
PHASE 3: Historical Data Migration ⏳
┌─────────────────────────────────────────────────────────────────────────┐
│ Status: IN PROGRESS (60%) Duration: 4w │
├─────────────────────────────────────────────────────────────────────────┤
│ ✓ Migrate users collection (2.3M records) │
│ ✓ Migrate products collection (150K records) │
│ ⏳ Migrate orders collection (5.2M records) - 60% complete │
│ Migrate reviews collection (890K records) │
│ Validate data integrity across all tables │
└─────────────────────────────────────────────────────────────────────────┘
│
▼
PHASE 4: Read Path Migration
┌─────────────────────────────────────────────────────────────────────────┐
│ Status: PENDING Duration: 2w │
├─────────────────────────────────────────────────────────────────────────┤
│ Switch read operations to PostgreSQL (feature flag) │
│ Run parallel queries and compare results │
│ Gradually increase PostgreSQL read traffic (10% → 100%) │
│ Monitor query performance and optimize indexes │
└─────────────────────────────────────────────────────────────────────────┘
│
▼
PHASE 5: Cutover & Cleanup
┌─────────────────────────────────────────────────────────────────────────┐
│ Status: PENDING Duration: 1w │
├─────────────────────────────────────────────────────────────────────────┤
│ Disable MongoDB writes │
│ Update all application configuration │
│ Archive MongoDB data │
│ Remove dual-write code and feature flags │
│ Document lessons learned │
└─────────────────────────────────────────────────────────────────────────┘
Summary: Phase 3 of 5 │ Overall Progress: ~55% │ On Track for Q4
Legend:
✓ = Complete ⏳ = In Progress (blank) = Pending
Explanation
This phased migration diagram provides:
- Clear progress visibility: Status and completion percentage per phase
- Detailed tasks: Specific actions within each phase
- Time estimates: Duration for planning purposes
- Overall summary: Quick status check at the bottom
The vertical flow shows dependencies between phases while the detailed boxes provide actionable information.
Usage Suggestions
- Include in weekly status updates
- Add to project management tools
- Share with stakeholders for progress visibility
- Update after each milestone completion