# SQLite Query Optimisation - How the Planner Thinks and Where It Goes Wrong

DevFeed: [SQLite Query Optimisation - How the Planner Thinks and Where It Goes Wrong](<https://devfeed.tech/articles/sqlite-query-optimisation-how-the-planner-thinks-and-where-it-goes-wrong-39650.md>)

Original publisher: [Read original article](<https://www.gauravsarma.com/posts/2026-03-08_sqlite-query-optimisation>)

Published: 2026-03-08T00:00:00Z

Content type: tutorial

Language: en

Sources: [Gaurav Sarma's Blog](<https://devfeed.tech/sources/gaurav-sarma-s-blog.md>)

Topics: [SQLite](<https://devfeed.tech/topics/sqlite.md>), [SQL](<https://devfeed.tech/topics/sql.md>), [Databases](<https://devfeed.tech/topics/databases.md>)

Tags: [b-tree](<https://devfeed.tech/tags/b-tree.md>), [index](<https://devfeed.tech/tags/index.md>), [optimisation](<https://devfeed.tech/tags/optimisation.md>), [planner](<https://devfeed.tech/tags/planner.md>), [query](<https://devfeed.tech/tags/query.md>), [query-planner](<https://devfeed.tech/tags/query-planner.md>), [sql](<https://devfeed.tech/tags/sql.md>), [sqlite](<https://devfeed.tech/tags/sqlite.md>)

## AI overview

A tutorial on how SQLite's query planner chooses between index searches and full table scans. It explains planner behavior, the effects of query patterns and data distribution, and how to avoid conditions that make indexes inaccessible or scans appear cheaper.

## Source excerpt

. [SQLite Query Optimisation](sqlite-query-optimisation-cover...