Foundations

Core principles and concepts referenced throughout the course.

Append-Only Event Storage
Bloom Filters / Probabilistic Membership
Cache-Aside (Lazy Loading)
Columnar Storage
Consensus
Consistent Hashing
Copy-On-Write & Immutability
CRDTs (Conflict-Free Replicated Data Types)
Denormalization For Read Paths
Eventual Consistency & Convergence
Eviction Policies
Hot-Partition / Hot-Key Mitigation
Idempotency
Leader–Follower Replication
Leaderless Replication
Leases & Fencing Tokens
Linearizability
Log-Structured Storage
Multi-Leader Replication
Multi-Tier Caching
MVCC (Multi-Version Concurrency Control)
Negative Caching
Optimistic vs Pessimistic Concurrency
Page-Oriented Storage
Quorums (R + W > N)
Range vs Hash Partitioning
Read Replicas & Replication Lag
Rebalancing & Resharding
Sagas (Long-Lived Transactions)
Schema-On-Read vs Schema-On-Write
Secondary Indexes
Sequential & Causal Consistency
Thundering Herd / Cache Stampede
TTL & Invalidation
Two-Phase & Three-Phase Commit
Write-Ahead Logging (WAL)
Write-Through / Write-Behind