SAVE this
B+ trees
LSM trees
Write-Ahead Logging (logging before writing)
Two-phase commit
Three-phase commit
Read-only replicas
Leader-follower replication
Sharding / partitioning
Query caching
Secondary indexes
Vector indexes (Vector Indexes, e.g., FAISS, HNSW)
Distributed JOINs
Materialized views
Event Sourcing (event-based state storage)
Change Data Capture (tracking data changes)
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