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Lessons (12)

• Behavioral Patterns I: Observer, Strategy, Command, State

  The four behavioral patterns you'll use most, explained with everyday analogies, diagrams and practical JavaScript. Why behavioral …

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

  Six more behavioral patterns, from Express-style middleware chains to undo snapshots, each with a picture and a …

• DBMS Foundations, Keys & Normalization

  … engine behavior differs. A primary key is always non-null. Q4 and Q5: Why DBMS instead of files …

• What Are Design Patterns?

  … Adapter, Bridge, Composite, Decorator, Facade, Flyweight, Proxy 🗣️ Behavioral How do objects talk and share work? Chain of …

• Releases, Observability and Production Safety

  … a small cohort before expansion Feature flag Change behavior without redeploying Schema migration Keep old/new app versions …

• Database Relations & Foreign Keys

  … Decide delete/update behavior before production data exists.

• Views, Triggers & Stored Procedures

  … refresh work and can be stale. Type Read behavior Cost --- --- --- View Runs the base query Query cost each …

• SQL Language, Identifiers & Data Types

  … Exact limits and behavior are engine-specific.

• Transactions, Indexes & Concurrency

  … Names and behavior vary by engine: state the database product you mean. Q11: Livelock versus deadlock Deadlock is …

• Replication, Partitioning & Sharding

  … Plan the router, shard map, ID generation, backups, rebalancing and degraded behavior before splitting. Cross-shard joins and …

• ACID, Transactions & Locks

  … Conditional update, version column or lock The exact behavior is engine-specific. In an interview, name the isolation …

• Scaling & Health Probes

  … 60 } % of the CPU request behavior: scaleDown: stabilizationWindowSeconds: 300 wait 5 min before scaling down (avoid flapping) mermaid …