Census Best Practices
Data Modeling for Census
Transform in the Warehouse, Not in Census
Anti-Pattern:
Best Practice:
Example:
Census Sync:
Design for Idempotency
Principle: Running the same sync multiple times should produce the same result.
How:
Include Metadata Fields
Always include:
Benefits:
- Troubleshoot stale data issues
- Track data lineage
- Debug sync problems
Sync Configuration
Choosing Sync Keys
Best Practices:
- Use Stable IDs:
- Match Destination Requirements:
- Composite Keys When Needed:
Choosing Sync Modes
Update or Create (Upsert) - Most Common:
Update Only:
Mirror:
Append:
Field Mapping Best Practices
1. Explicit Over Implicit:
2. Use Destination Field Labels:
3. Handle Nulls Appropriately:
4. Lookups for Foreign Keys:
Scheduling & Performance
Sync Frequency Guidelines
Real-Time (minutes):
Hourly:
Daily:
Weekly:
Optimize Sync Performance
1. Filter at Source:
2. Use Incremental Syncs:
3. Batch Large Syncs:
4. Monitor Destination Rate Limits:
Error Handling
Proactive Error Prevention
1. Validate Data in Warehouse:
2. Handle Nulls in Required Fields:
3. Respect Destination Constraints:
Monitoring & Alerting
Set Up Alerts:
Alert Channels by Severity:
Create Monitoring Dashboard:
Debugging Failed Records
1. Export Failed Records:
2. Test in Destination:
3. Common Failure Patterns:
Security & Compliance
Principle of Least Privilege
Warehouse Access:
Destination Access:
PII & Sensitive Data
1. Minimize PII Exposure:
2. Pseudonymize When Possible:
3. Audit Data Access:
Compliance Considerations
GDPR / CCPA:
Data Residency:
Governance & Collaboration
Documentation
Document Each Sync:
dbt Exposures:
Change Management
Making Changes to Syncs:
Version Control Syncs:
Cost Optimization
Reduce Synced Row Count
1. Sync Only What Changed:
2. Use Audiences for Reusable Segments:
3. Consolidate Syncs:
Right-Size Sync Frequency
Testing Syncs
Pre-Production Testing
1. Start with Google Sheets:
2. Use Test Destination:
3. Limit Initial Sync:
Automated Testing
dbt Tests on Census Source Models:
Census Validation Rules (if available):
Ready to see these practices in action? Check out Use Cases for real-world examples!