AliSQL is a customized branch of MySQL developed by Alibaba Cloud, designed to meet the demands of high-throughput, high-concurrency, and low-latency online transaction processing systems. Building upon the MySQL Community Edition, AliSQL introduces enterprise-grade features and optimizations that enhance performance, stability, and security, making it particularly suitable for large-scale enterprise applications. Key Features and Functionality: - Thread Pool: Implements a listener-worker processing model to improve connection handling and optimize concurrency for various operations, ensuring consistent high performance under heavy loads. - Statement Outline: Utilizes optimizer and index hints to stabilize SQL execution plans, preventing performance degradation due to data changes, index modifications, or parameter adjustments. - Fast Query Cache: Redesigns the native MySQL query cache to enhance concurrency control, memory management, and caching mechanisms, significantly boosting query performance. - Binlog in Redo: Synchronizes binary log content with redo logs during transaction commits, reducing disk I/O operations and improving overall database performance. - Faster DDL: Optimizes buffer pool management strategies to minimize lock contention during Data Definition Language operations, allowing schema changes to be performed efficiently even under high business pressure. - Async File Purge: Introduces asynchronous file cleanup tasks for large file deletions, preventing file system locks and ensuring uninterrupted database operations. - Slow Log Rotate: Implements a mechanism to rotate slow query logs based on time or file size, facilitating maintenance without requiring database restarts. - SQL Outline: Extends SQL hints to persist execution paths, ensuring stable execution plans across database upgrades, index changes, and statistical information updates. Primary Value and Problem Solving: AliSQL addresses the challenges faced by large enterprises in managing high-volume, high-concurrency transactional workloads. By enhancing MySQL with enterprise-level features and optimizations, AliSQL provides a robust, efficient, and secure database solution that supports seamless scalability and reliable performance. Its advanced capabilities, such as improved connection handling, optimized query execution, and efficient schema management, empower businesses to maintain database stability and performance, even during peak operational periods.