Cloud Platform Reference Data
Resilience Levels
Critical
System failure causes immediate revenue loss or safety risk.
High
System failure causes significant business disruption within hours.
Medium
System failure causes moderate impact, workarounds available.
Low
System failure has minimal business impact.
Deployment Strategies
Blue-Green
Two identical environments; traffic switches instantly.
Canary
Gradual rollout to a subset of users before full deployment.
Rolling
Instances updated one at a time with zero downtime.
Recreate
All instances terminated and recreated (brief downtime).
Service Tiers
Tier 1 (99.99%)
Mission-critical: 99.99% uptime SLA, < 5min recovery.
Tier 2 (99.9%)
Business-critical: 99.9% uptime SLA, < 1hr recovery.
Tier 3 (99%)
Operational: 99% uptime SLA, < 4hr recovery.
Database Engines
PostgreSQL
MySQL
MongoDB
Redis