算法（排序与堆，中等）： 912. 排序数组（手写快速排序），题解见 快速排序。 综合题：订单表有 2000 万行，按用户查询最近的订单很慢，同时下单高峰期还出现了死锁：分别怎样分析和解决？ （见 使用 Explain 进行分析 、 索引优化 、 MySQL 死锁） ...

原创 最新推荐文章于 2026-10-07 15:27:05 发布 · 297 阅读 本文详解基于Servlet、JSP与MySQL构建学生成绩管理系统的完整开发流程 ...

本内容遵循CC 4.0 BY-SA版权协议 本文深入解析MongoDB的文档模型、索引机制、事务支持等核心特性，重点介绍Spring Data MongoDB的集成实践、聚合框架高级用法及性能优化策略。涵盖生产环境常见陷阱（如N+1查询、索引失效、大文档）、监控调优工具（explain、mongostat ...

You have started studying Java and are writing code while following reference books or videos.If you type exactly as explained, the program runs and no errors occur.However, when you try to 'build ...

A runnable, interview-focused reference for the Java Collections Framework (Java 17+). Each major collection has its own Java file. Examples demonstrate commonly used methods, and comments explain the ...

The purpose of the change feed is to provide transaction logs of all the changes that occur to the blobs and the blob metadata in your storage account. The change feed provides ordered, guaranteed, ...

A comprehensive review of Oracle Java Silver SE 17 exception handling, supplementary learning for lambdas and Streams, and collections and generics, using topic-specific questions. This material is ...