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MCTuner: Spatial Decomposition-Enhanced Database Tuning via LLM-Guided Exploration

Summary: MCTuner uses a Mixture-of-Experts of LLMs to pinpoint performance‑critical knobs and avoid ineffective regions in high‑dimensional config spaces. Its recursive spatial decomposition runs Bayesian optimization on hierarchical subspaces, yielding up to 19.2% gains and 1.4× faster discovery versus SOTA. (summarized by gpt-5-mini on Feb 11 2026)

Paper ID
h7d7e1f2c79122917
Venue
SIGMOD
Year
2026
Pagerank
4.9605343e-05
Overall Rank
10,653 | 28.60%
DOI
10.1145/3769807

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Authors

BibTeX Citation

@inproceedings{yan_sigmod26,
        title = {{MCTuner: Spatial Decomposition-Enhanced Database Tuning via LLM-Guided Exploration}},
        author = {Yan, Zihan and Xi, Rui and Hou, Mengshu},
        series = {{SIGMOD} '26},
        booktitle = {Proceedings of the {ACM} {SIGMOD} International Conference on Management of Data},
        publisher = {Association for Computing Machinery},
        doi = {10.1145/3769807},
        url = {https://dl.acm.org/doi/10.1145/3769807},
        year = {2026}
}

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Outgoing Citations (Sorted by Pagerank)

Showing 30 of 30 cited papers.

Citations counted here include only citations to other VLDB/SIGMOD/CIDR/PODS papers in this database.

Rank Cited Paper Year Venue Pagerank
15 How Good Are Query Optimizers, Really? 2016 VLDB 0.00061463175
74 Automatic Database Management System Tuning Through Large-scale Machine Learning 2017 SIGMOD 0.00037164008
236 OLTP-Bench: An Extensible Testbed for Benchmarking Relational Databases 2014 VLDB 0.00023639649
309 An End-to-End Automatic Cloud Database Tuning System Using Deep Reinforcement Learning 2019 SIGMOD 0.0002143249
313 Tuning Database Configuration Parameters with iTuned 2009 VLDB 0.00021288111
411 QTune: A Query-Aware Database Tuning System with Deep Reinforcement Learning 2019 VLDB 0.0001874043
501 CodeS: Towards Building Open-source Language Models for Text-to-SQL 2024 SIGMOD 0.00017239952
1,238 DB-BERT: A Database Tuning Tool that "Reads the Manual" 2022 SIGMOD 0.00011375179
1,294 An Inquiry into Machine Learning-based Automatic Configuration Tuning Services on Real-World Database Management Systems 2021 VLDB 0.00011129451
1,652 SQL Memory Management in Oracle9i 2002 VLDB 9.9624199e-05
1,656 D-Bot: Database Diagnosis System using Large Language Models 2024 VLDB 9.948529e-05
1,700 Black or White? How to Develop an AutoTuner for Memory-based Analytics 2020 SIGMOD 9.8224761e-05
1,931 CodexDB: Synthesizing Code for Query Processing from Natural Language Instructions using GPT-3 Codex 2022 VLDB 9.3449634e-05
1,956 LLM-R^2: A Large Language Model Enhanced Rule-based Rewrite System for Boosting Query Efficiency 2025 VLDB 9.2927535e-05
2,117 The Dawn of Natural Language to SQL: Are We Fully Ready? 2024 VLDB 9.0012524e-05
2,227 GPTuner: A Manual-Reading Database Tuning System via GPT-Guided Bayesian Optimization 2024 VLDB 8.7924681e-05
2,572 ResTune: Resource Oriented Tuning Boosted by Meta-Learning for Cloud Databases 2021 SIGMOD 8.2581875e-05
2,779 Facilitating Database Tuning with Hyper-Parameter Optimization: A Comprehensive Experimental Evaluation 2022 VLDB 8.0085666e-05
2,995 Panda: Performance Debugging for Databases using LLM Agents 2024 CIDR 7.7556154e-05
3,057 LlamaTune: Sample-Efficient DBMS Configuration Tuning 2022 VLDB 7.6865211e-05
3,172 CGPTuner: a Contextual Gaussian Process Bandit Approach for the Automatic Tuning of IT Configurations Under Varying Workload Conditions 2021 VLDB 7.5556865e-05
3,486 HUNTER: An Online Cloud Database Hybrid Tuning System for Personalized Requirements 2022 SIGMOD 7.2428834e-05
3,655 UDO: Universal Database Optimization using Reinforcement Learning 2021 VLDB 7.1137504e-05
4,101 Towards Dynamic and Safe Configuration Tuning for Cloud Databases 2022 SIGMOD 6.7930727e-05
4,383 R-Bot: An LLM-based Query Rewrite System 2025 VLDB 6.6140223e-05
5,304 An Efficient Transfer Learning Based Configuration Adviser for Database Tuning 2024 VLDB 6.1758143e-05
6,121 Breaking It Down: An In-depth Study of Index Advisors 2024 VLDB 5.863893e-05
7,092 E2ETune: End-to-End Knob Tuning via Fine-tuned Generative Language Model 2025 VLDB 5.5868637e-05
7,257 RCRank: Multimodal Ranking of Root Causes of Slow Queries in Cloud Database Systems 2025 VLDB 5.5579707e-05
7,768 DBG-PT: A Large Language Model Assisted Query Performance Regression Debugger 2024 VLDB 5.4392507e-05
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