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Tencent Cloud Developer
Tencent Cloud Developer
Feb 22, 2024 · Databases

MongoDB Lock Mechanisms and Implementation Details

MongoDB’s locking system uses a hierarchical resource model with four lock modes, RAII‑style acquisition classes, ticket‑based throttling, and a bucketed lock manager that employs bit‑mask conflict checks and priority flags to grant exclusive locks promptly and prevent starvation.

ConcurrencyDatabaseLock Manager
0 likes · 42 min read
MongoDB Lock Mechanisms and Implementation Details
Tencent Database Technology
Tencent Database Technology
Mar 8, 2021 · Databases

Introduction to the InnoDB Lock Module and Its Performance Optimizations

This article provides a comprehensive overview of MySQL InnoDB's lock subsystem, describing its data structures, lock compatibility matrices, lock/unlock workflows, lock splitting, inheritance and migration, and presents several optimization techniques such as avoiding lock_sys mutex, asynchronous deadlock detection, and lock_sys mutex sharding to alleviate contention in MySQL 5.7 and later versions.

ConcurrencyDatabase InternalsInnoDB
0 likes · 13 min read
Introduction to the InnoDB Lock Module and Its Performance Optimizations