/courses/sql/optimizing-postgresql/Recent content in Optimizing PostgreSQL on DATATWEETSHugoenCopyright (c) 2025 DatatweetsTue, 23 Jun 2026 09:00:00 +0200/courses/sql/optimizing-postgresql/lesson-1-exploring-postgresql-internals/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/optimizing-postgresql/lesson-1-exploring-postgresql-internals/Use Postgres internal catalogs to list tables, map type codes to readable names, count rows, and build a JSON description of a database whose structure nobody documented for you./courses/sql/optimizing-postgresql/lesson-2-reading-query-plans-with-explain/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/optimizing-postgresql/lesson-2-reading-query-plans-with-explain/Use EXPLAIN to see how Postgres plans a query, read cost estimates and the query plan tree, then use EXPLAIN ANALYZE to measure real execution times — safely rolling back destructive queries./courses/sql/optimizing-postgresql/lesson-3-speeding-up-queries-with-indexes/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/optimizing-postgresql/lesson-3-speeding-up-queries-with-indexes/Create your first Postgres index, watch a query run four times faster, learn how a B-tree turns a full scan into a logarithmic lookup, and understand when an index helps and when it does not./courses/sql/optimizing-postgresql/lesson-4-advanced-indexing-strategies/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/optimizing-postgresql/lesson-4-advanced-indexing-strategies/Go beyond single-column indexes: read Bitmap scans, build multi-column indexes and understand why column order matters, and create expression and partial indexes that target the exact queries your team runs./courses/sql/optimizing-postgresql/lesson-5-vacuuming-transactions-and-acid/Fri, 14 Nov 2025 09:00:00 +0200/courses/sql/optimizing-postgresql/lesson-5-vacuuming-transactions-and-acid/Learn why DELETE leaves dead rows behind, how ACID and multi-version control explain it, and how to reclaim space and refresh statistics with VACUUM, VACUUM ANALYZE, VACUUM FULL, and autovacuum.