⏱ 6 min read Database indexes are data structures that allow the database engine to find rows matching a query condition without scanning the […] Read article

⏱ 3 min read Consensus algorithms allow a cluster of nodes to agree on a single value even when some nodes fail or messages Read article

⏱ 4 min read OAuth 2.0 is an authorization framework that allows applications to obtain limited access to user accounts on third-party services without Read article

⏱ 6 min read WebSockets provide full-duplex, persistent communication between a browser and server over a single TCP connection. Unlike HTTP request-response, either side Read article

⏱ 4 min read Sharding (horizontal partitioning) splits a large dataset across multiple database nodes to scale beyond what a single machine can handle. Read article

⏱ 4 min read An operating system scheduler decides which process or thread runs on each CPU core at any given moment. The scheduler Read article

⏱ 3 min read A memory allocator manages heap memory — fulfilling malloc/new requests and returning freed memory for reuse. The C standard library Read article

⏱ 3 min read Database replication copies data from a primary database to one or more replica databases to achieve high availability, read scalability, Read article

⏱ 5 min read TCP and UDP are the two dominant transport-layer protocols underpinning all internet communication. TCP provides reliable, ordered, connection-oriented delivery with Read article

⏱ 3 min read A distributed lock manager (DLM) coordinates exclusive access to shared resources across multiple processes or services running on different machines. Read article

⏱ 3 min read A columnar database stores table data organized by column rather than by row, making it dramatically more efficient for analytical Read article

⏱ 5 min read Forward proxies, reverse proxies, and load balancers are often confused because they all sit between clients and servers in a Read article

⏱ 3 min read DNS (Domain Name System) is the distributed hierarchical database that translates human-readable domain names (techinterview.org) into IP addresses (67.207.83.166). Every Read article

⏱ 3 min read The Log-Structured Merge-tree (LSM-tree) is a data structure optimized for write-heavy workloads. Unlike B-trees that update pages in place (causing Read article

⏱ 5 min read Garbage collection (GC) automatically reclaims memory occupied by objects no longer reachable from the application. The JVM provides multiple GC Read article