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SQLite EXPLAIN QUERY PLAN: Why Your Query Scans, and Index Design That Fixes It

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Self-Hosting & Infra intermediate 6 min read $0.01 Updated 2026-10-20

Measured on a 200,000-row SQLite table: SCAN versus SEARCH plans, 8.4 ms down to 0.1 ms, composite index column order, temp B-tree for ORDER BY, and queries that still scan such as lower(), cust+0, LIKE %x% and OR.

Slow SQLite or Postgres queries often scan the whole table. Read EXPLAIN QUERY PLAN, build a composite index in the right order, and avoid expressions and leading wildcards that disable indexes.

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