# Query Optimizer

- [Block-Based Join Algorithms](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/block-based-join-algorithms.md)
- [Condition Selectivity Computation Internals](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/condition-selectivity-computation-internals.md)
- [Extended Keys](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/extended-keys.md)
- [MIN/MAX optimization](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/minmax-optimization.md)
- [Notes When an Index Cannot Be Used](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/notes-when-an-index-cannot-be-used.md)
- [Optimizer Debugging With GDB](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/optimizer-debugging-with-gdb.md)
- [Optimizer Development](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/optimizer-development.md)
- [optimizer\_max\_sel\_arg\_weight](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/optimizer_max_sel_arg_weight.md)
- [Range Optimizer](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/range-optimizer.md)
- [The Optimizer Cost Model from MariaDB 11.0](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/the-optimizer-cost-model-from-mariadb-11-0.md)
- [Optimizer Trace](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/optimizer-trace.md)
- [Basic Optimizer Trace Example](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/optimizer-trace/basic-optimizer-trace-example.md)
- [How to Collect Large Optimizer Traces](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/optimizer-trace/how-to-collect-large-optimizer-traces.md)
- [Optimizer Trace for Developers](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/optimizer-trace/optimizer-trace-for-developers.md)
- [Optimizer Trace Guide](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/optimizer-trace/optimizer-trace-guide.md)
- [Optimizer Trace Overview](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/optimizer-trace/optimizer-trace-overview.md)
- [Optimizer Trace Resources](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/optimizer-trace/optimizer-trace-resources.md)


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.