Detecting Full Table Scans With SQLite
7.2 relevance
Score Breakdown
technical depth 8
novelty 6
actionability 9
community 5
strategic 4
personal 9
Scored daily by a customisable AI persona to surface the most relevant engineering leadership news.
Practical technique for detecting full table scans in SQLite, directly applicable to database observability and performance tuning.
Summary
SQLite exposes per-statement statistics via `stmt.stat(:fullscan_steps)`, enabling detection of full table scans after query execution without using EXPLAIN. A Ruby example shows querying an unindexed column yields high fullscan_steps, which drops to zero after adding an index. The author proposes integrating this check into Rails test/development environments to fail on full scans, catching performance regressions early.