percona.com
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Percona is an open-source database solutions site focused on performance, tuning, and optimization. It features tutorials, blogs, webinars, case studies, and tools for MySQL, PostgreSQL, and MongoDB performance, backups, and monitoring.
More resources on Database Performance
Percona Blog
Database performance articles for MySQL/PostgreSQL.
PG Mustard Blog
PostgreSQL performance tips and tools.
Use The Index, Luke
Free guide to SQL indexes and performance by Markus Winand.
PostgreSQL Performance Optimization
Boost PostgreSQL performance! Learn optimization techniques with this course from Database Star. Master database performance now.
use-the-index-luke.com
Use The Index, Luke! is a practical guide to database indexing and query optimization, showing how proper indexes speed up SQL performance. It offers tutorials, explanations of index types and strategies, and hands-on examples across relational databases to design, implement, and tune indexes for faster queries.
High Performance MySQL
High Performance MySQL - A book resource