# Page Not Found

The URL `ref/mdb/system-variables/optimizer_trace_max_mem_size` does not exist.

You might be looking for one of these pages:
- [Optimizing key_buffer_size](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/system-variables/optimizing-key_buffer_size.md)
- [Optimizing table_open_cache](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/system-variables/optimizing-table_open_cache.md)
- [Optimizer Trace Guide](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizer/optimizer-trace/optimizer-trace-guide.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)
- [MariaDB Optimization for MySQL Users](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/system-variables/mariadb-optimization-for-mysql-users.md)

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