# Query Optimizer

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