# Page Not Found

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

You might be looking for one of these pages:
- [Filesystem Optimizations](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/operating-system-optimizations/filesystem-optimizations.md)
- [Semisynchronous Replication Plugin Status Variables](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/system-variables/semisynchronous-replication-plugin-status-variables.md)
- [not_null_range_scan Optimization](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/query-optimizations/not_null_range_scan-optimization.md)
- [Optimizing table_open_cache](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/system-variables/optimizing-table_open_cache.md)
- [Optimizing key_buffer_size](https://mariadb.com/docs/server/ha-and-performance/optimization-and-tuning/system-variables/optimizing-key_buffer_size.md)

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