https://databases.wyattau.com Database administration and SQL reference notes. en Fri, 24 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/favicon.svg https://databases.wyattau.com https://databases.wyattau.com/practice-database-design Practice exercises for relational database design Fri, 24 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/practice-database-design https://databases.wyattau.com/about About Wyatt Thu, 23 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/about https://databases.wyattau.com/index Database administration and SQL reference notes. Wed, 22 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/index https://databases.wyattau.com/relational-theory/relational-theory The relational model provides a mathematically rigorous foundation for data management. Tue, 21 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/relational-theory/relational-theory https://databases.wyattau.com/sql-fundamentals/advanced-sql Advanced SQL notes covering key definitions, core concepts, worked examples, and practice questions for targeted learning and effective revision. Mon, 20 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/sql-fundamentals/advanced-sql https://databases.wyattau.com/sql-fundamentals/sql SQL is defined by ANSI/ISO standards (SQL-86, SQL-89, SQL-92, SQL:1999, SQL:2003, SQL:2006, SQL:2008, SQL:2011, SQL:2016, SQL:2019, SQL:2023). No database Sun, 19 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/sql-fundamentals/sql https://databases.wyattau.com/indexing-optimization/indexing Without an index, finding a specific row in a table of rows requires a full sequential scan, Which is . A B-tree index reduces this to -- for a table of one Sat, 18 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/indexing-optimization/indexing https://databases.wyattau.com/indexing-optimization/query-optimization Query optimization techniques for database performance. Fri, 17 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/indexing-optimization/query-optimization https://databases.wyattau.com/transactions/locking-and-deadlocks PostgreSQL uses a multi-level locking system that operates at different granularities. Understanding Each lock type is essential for diagnosing performance Thu, 16 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/transactions/locking-and-deadlocks https://databases.wyattau.com/transactions/transactions ACID is the set of guarantees that a relational database transaction provides. Understanding what Each property actually guarantees -- and what it does not Wed, 15 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/transactions/transactions https://databases.wyattau.com/nosql/nosql NoSQL databases and the CAP theorem. Tue, 14 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/nosql/nosql https://databases.wyattau.com/nosql/postgresql-advanced PostgreSQL Advanced notes covering key definitions, core concepts, worked examples, and practice questions for detailed study and thorough revision. Mon, 13 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/nosql/postgresql-advanced https://databases.wyattau.com/nosql/redis Redis is a single-threaded, event-driven, in-memory data structure store. It uses I/O multiplexing (//) to handle thousands of concurrent connections on a Sun, 12 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/nosql/redis https://databases.wyattau.com/database-design/data-modeling Normalization eliminates redundancy and update anomalies, but there is a point of diminishing Returns. The decision of when to stop depends on your Sat, 11 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/database-design/data-modeling https://databases.wyattau.com/database-design/database-design Database design is not a one-step activity. It is a disciplined process that moves from abstract Requirements to concrete physical implementation. Skipping Fri, 10 Jul 2026 00:00:00 +0000 https://databases.wyattau.com/database-design/database-design https://databases.wyattau.com Database administration and SQL reference notes. Thu, 09 Jul 2026 00:00:00 +0000 https://databases.wyattau.com