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Lessons (8)

• Releases, Observability and Production Safety

  Ship changes safely with rollout strategy, flags, migration discipline, rollback plans and observable service-level outcomes. ![Safe release …

• Deploying & Operating Microservices

  … v2 (ready)"] ✅ Instant switch and instant rollback. ❌ Double the infrastructure while both run; database changes must work with …

• Deployments, ReplicaSets & Rollouts

  … Deployments, ReplicaSets, labels and selectors, rolling updates, rollbacks, plus StatefulSets, DaemonSets and Jobs. The big idea A shift …

• Helm, kubectl Cheat Sheet & Best Practices

  … bitnami/redis -f my-redis-values.yaml helm rollback my-redis 1 helm uninstall my-redis -n cache …

• SQL Language, Identifiers & Data Types

  … Many systems call COMMIT and ROLLBACK transaction-control statements. Q7: Identity, sequence and UUID An identity/auto-increment …

• Why Kubernetes?

  … new → downtime Rolling updates with zero downtime, and rollback "Which server has space?" Spreadsheets and guesswork Scheduler places …

• Database Indexing & Transactions

  … call or user input inside one. - Always handle rollback on errors (most ORMs do this for you). - Lock …

• Behavioral Patterns II: Chain, Template, Iterator, Mediator, Memento, Visitor

  … Google Docs, Redux DevTools time travel, database transactions (rollback). 💡 Memento vs Command for undo: Memento stores snapshots (simple …