Behind every fast query, smart filter, or scalable database lies a powerful data structure.
These 20 structures arenโt just theory, theyโre the backbone of real-world systems that power search engines, time-series storage, blockchain, and more.
1. Indexing Structures
Hash Index, B-Tree, Skiplist, Bitmap Index, Trie
These are the go-to structures for fast data access. Whether itโs quick key-value lookups in memory or sorted traversals on disk, these structures form the core of query performance in most databases.
2. Search & Pattern Matching
Inverted Index, Suffix Tree, Segment Tree, R-Tree
Designed for deep searches โ from documents and strings to spatial queries โ these structures support full-text search, multi-dimensional lookups, and real-time analytics.
3. Write-Optimized Storage
LSM Tree, SSTable, Bloom Filter
High-ingestion databases like Cassandra and RocksDB rely on these to optimize write speed while managing data compaction and fast approximate lookups with minimal memory overhead.
4. Spatial & Range Indexing
Quad Tree, Z-order Curve, Segment Tree
Used in applications like maps, game engines, and time-series systems โ these structures help partition and access multi-dimensional or sequential data efficiently.
5. Advanced Use Cases
Merkle Tree, Suffix Tree, Bloom Filter
From verifying blockchain transactions to bioinformatics and deduplication in distributed systems โ these data structures are built for reliability and integrity at scale.
Knowing these structures and more importantly, where theyโre used - helps you design database systems that are optimized, reliable, and scalable.