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This article introduces and compares major database categories—including relational, key‑value, document, columnar, graph, and time‑series databases—explaining their structures, typical use cases, and advantages, helping readers understand when to choose each type for various applications.
This article provides a concise tutorial on Elasticsearch 7.x, explaining what documents and indices are, how unique IDs and metadata work, and demonstrating key REST API commands for managing and querying data in a search‑engine context.
This article explains what NoSQL databases are, introduces the CAP theorem that underlies their design trade‑offs, outlines typical application scenarios, discusses their limitations, classifies the main NoSQL families, and reviews four widely used systems—Redis, HBase, Cassandra, and MongoDB.
This article explains the limitations of traditional relational databases, introduces the emergence of NoSQL, categorizes its four main types—key‑value, document‑oriented, column‑family, and graph—detailing popular products, typical use cases, and scenarios where each is unsuitable.