Databases
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Databases are where applications store, organize, retrieve and protect structured or semi-structured information. Coverage here includes data models, queries, indexing, transactions, schema design, performance, consistency, backup, scaling and the practical differences between database approaches. The category focuses on persistent data systems rather than application code or cloud infrastructure as a whole. Readers gain a clearer basis for choosing data structures, diagnosing slow queries and designing reliable storage for software workloads.