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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
7403
Venue
SIGMOD
Year
2026
Pagerank
4.1945683e-05
Overall Rank
10,093 | 29.79%
DOI
10.1145/3769807

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

Rank Cited Paper Year Venue Pagerank
71 How Good Are Query Optimizers, Really? 2016 VLDB 0.00059038975
183 Automatic Database Management System Tuning Through Large-scale Machine Learning 2017 SIGMOD 0.00036721403
340 OLTP-Bench: An Extensible Testbed for Benchmarking Relational Databases 2014 VLDB 0.00026841628
424 Tuning Database Configuration Parameters with iTuned 2009 VLDB 0.00023616398
514 An End-to-End Automatic Cloud Database Tuning System Using Deep Reinforcement Learning 2019 SIGMOD 0.0002124895
782 QTune: A Query-Aware Database Tuning System with Deep Reinforcement Learning 2019 VLDB 0.00016729063
998 CodeS: Towards Building Open-source Language Models for Text-to-SQL 2024 SIGMOD 0.00014729379
1,407 DB-BERT: A Database Tuning Tool that "Reads the Manual" 2022 SIGMOD 0.00012146739
1,643 CodexDB: Synthesizing Code for Query Processing from Natural Language Instructions using GPT-3 Codex 2022 VLDB 0.0001104256
1,810 SQL Memory Management in Oracle9i 2002 VLDB 0.0001047003
1,827 An Inquiry into Machine Learning-based Automatic Configuration Tuning Services on Real-World Database Management Systems 2021 VLDB 0.00010390548
1,902 Black or White? How to Develop an AutoTuner for Memory-based Analytics 2020 SIGMOD 0.00010157713
1,956 D-Bot: Database Diagnosis System using Large Language Models 2024 VLDB 9.960627e-05
3,114 GPTuner: A Manual-Reading Database Tuning System via GPT-Guided Bayesian Optimization 2024 VLDB 7.5451724e-05
3,472 LLM-R2: A Large Language Model Enhanced Rule-based Rewrite System for Boosting Query Efficiency 2025 VLDB 7.0639229e-05
3,522 ResTune: Resource Oriented Tuning Boosted by Meta-Learning for Cloud Databases 2021 SIGMOD 7.0096727e-05
3,662 The Dawn of Natural Language to SQL: Are We Fully Ready? 2024 VLDB 6.8672143e-05
3,812 Facilitating Database Tuning with Hyper-Parameter Optimization: A Comprehensive Experimental Evaluation 2022 VLDB 6.7373184e-05
4,238 Panda: Performance Debugging for Databases using LLM Agents 2024 CIDR 6.331901e-05
4,265 CGPTuner: a Contextual Gaussian Process Bandit Approach for the Automatic Tuning of IT Configurations Under Varying Workload Conditions 2021 VLDB 6.3097793e-05
4,380 LlamaTune: Sample-Efficient DBMS Configuration Tuning 2022 VLDB 6.2396606e-05
4,399 HUNTER: An Online Cloud Database Hybrid Tuning System for Personalized Requirements 2022 SIGMOD 6.2225151e-05
4,842 Towards Dynamic and Safe Configuration Tuning for Cloud Databases 2022 SIGMOD 5.8826802e-05
4,913 UDO: Universal Database Optimization using Reinforcement Learning 2021 VLDB 5.8316231e-05
6,151 An Efficient Transfer Learning Based Configuration Adviser for Database Tuning 2024 VLDB 5.183652e-05
6,750 Breaking It Down: An In-depth Study of Index Advisors 2024 VLDB 4.9392771e-05
7,035 R-Bot: An LLM-based Query Rewrite System 2025 VLDB 4.8548467e-05
7,989 RCRank: Multimodal Ranking of Root Causes of Slow Queries in Cloud Database Systems 2025 VLDB 4.6124681e-05
8,186 E2ETune: End-to-End Knob Tuning via Fine-tuned Generative Language Model 2025 VLDB 4.5651684e-05
9,277 DBG-PT: A Large Language Model Assisted Query Performance Regression Debugger 2024 VLDB 4.3640804e-05
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