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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
7593
Venue
SIGMOD
Year
2026
Pagerank
5.093636e-05
Overall Rank
10,384 | 28.76%
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
18 How Good Are Query Optimizers, Really? 2016 VLDB 0.00059284255
86 Automatic Database Management System Tuning Through Large-scale Machine Learning 2017 SIGMOD 0.00035316107
226 OLTP-Bench: An Extensible Testbed for Benchmarking Relational Databases 2014 VLDB 0.00024027277
334 An End-to-End Automatic Cloud Database Tuning System Using Deep Reinforcement Learning 2019 SIGMOD 0.00020875082
347 Tuning Database Configuration Parameters with iTuned 2009 VLDB 0.00020651582
498 QTune: A Query-Aware Database Tuning System with Deep Reinforcement Learning 2019 VLDB 0.00017440583
756 CodeS: Towards Building Open-source Language Models for Text-to-SQL 2024 SIGMOD 0.0001431656
1,337 DB-BERT: A Database Tuning Tool that "Reads the Manual" 2022 SIGMOD 0.00011117488
1,344 An Inquiry into Machine Learning-based Automatic Configuration Tuning Services on Real-World Database Management Systems 2021 VLDB 0.00011094717
1,686 Black or White? How to Develop an AutoTuner for Memory-based Analytics 2020 SIGMOD 0.00010008686
1,706 SQL Memory Management in Oracle9i 2002 VLDB 9.9628446e-05
1,920 D-Bot: Database Diagnosis System using Large Language Models 2024 VLDB 9.4846185e-05
2,298 GPTuner: A Manual-Reading Database Tuning System via GPT-Guided Bayesian Optimization 2024 VLDB 8.7886538e-05
2,521 CodexDB: Synthesizing Code for Query Processing from Natural Language Instructions using GPT-3 Codex 2022 VLDB 8.4729505e-05
2,553 LLM-R^2: A Large Language Model Enhanced Rule-based Rewrite System for Boosting Query Efficiency 2025 VLDB 8.4283807e-05
2,740 Facilitating Database Tuning with Hyper-Parameter Optimization: A Comprehensive Experimental Evaluation 2022 VLDB 8.1855759e-05
2,852 The Dawn of Natural Language to SQL: Are We Fully Ready? 2024 VLDB 8.0455088e-05
3,116 ResTune: Resource Oriented Tuning Boosted by Meta-Learning for Cloud Databases 2021 SIGMOD 7.7390737e-05
3,343 LlamaTune: Sample-Efficient DBMS Configuration Tuning 2022 VLDB 7.4983591e-05
3,346 CGPTuner: a Contextual Gaussian Process Bandit Approach for the Automatic Tuning of IT Configurations Under Varying Workload Conditions 2021 VLDB 7.4967834e-05
3,587 HUNTER: An Online Cloud Database Hybrid Tuning System for Personalized Requirements 2022 SIGMOD 7.2829345e-05
3,757 Panda: Performance Debugging for Databases using LLM Agents 2024 CIDR 7.1483644e-05
3,926 UDO: Universal Database Optimization using Reinforcement Learning 2021 VLDB 7.0128068e-05
4,011 Towards Dynamic and Safe Configuration Tuning for Cloud Databases 2022 SIGMOD 6.959982e-05
5,171 An Efficient Transfer Learning Based Configuration Adviser for Database Tuning 2024 VLDB 6.3347618e-05
6,259 R-Bot: An LLM-based Query Rewrite System 2025 VLDB 5.93967e-05
6,327 Breaking It Down: An In-depth Study of Index Advisors 2024 VLDB 5.9124005e-05
6,997 E2ETune: End-to-End Knob Tuning via Fine-tuned Generative Language Model 2025 VLDB 5.7300324e-05
7,825 RCRank: Multimodal Ranking of Root Causes of Slow Queries in Cloud Database Systems 2025 VLDB 5.5367884e-05
9,351 DBG-PT: A Large Language Model Assisted Query Performance Regression Debugger 2024 VLDB 5.2839552e-05
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