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[帮助文档] 如何通过Java SDK并发导出数据

当使用场景中不关心整个结果集的顺序时，您可以使用并发导出数据功能以更快的速度将命中的数据全部返回。

看山聊并发：认识 Java 中的队列：Vector、ArrayList、CopyOnWriteArrayList、SynchronizedList

你好，我是看山。书接上文，上次聊了聊在多线程中使用 ArrayList 会发生什么，这次我们说说平时常用的列表：Vector、ArrayList、CopyOnWriteArrayList、SynchronizedList。VectorVector是在 JDK 1.0 提供的，虽然没有被标记Depr...

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Java Spring Boot 2.6.0开发实战-1024程序员节创造营公益课

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并发情况下切忌通过java代码更新mysql资金字段

并发情况下切忌通过java代码更新mysql资金字段。“王二，username=00010001这个账户多了10万块钱，赶紧排查一下原因。” “开玩笑吧”对于用户出金，mysql数据库一般有两张表，money_transfer和usermoney表，然后逻辑上有以下步骤：用户提出出金申请，u...

Redis 的并发竞争问题是什么？如何解决这个问题？【Java问答】39期

面试题 Redis 的并发竞争问题是什么？如何解决这个问题？了解 Redis 事务的 CAS 方案吗？面试官心理分析这个也是线上非常常见的一个问题，就是多客户端同时并发写一个 key，可能本来应该先到的数据后到了，导致数据版本错了；或者是多客户端同时获取一个 key，修改值之后再写回去，只要顺序...

并发时Java HttpSession串号问题? 400 报错

并发时Java HttpSession串号问题? 400 报错框架为SpringMVC+Mybatis，在用户登录时候保存用户信息到HttpSession中，而后从Session中获取用户的部分信息。在本地测试中没有问题，但是放到真实环境中，用户产生并发则出现Session串号的问题（A用户看到的...

java并发笔记之java线程模型

java并发笔记之java线程模型java当中的线程和操作系统的线程是什么关系？猜想： java thread —-对应-—> OS thread Linux关于操作系统的线程控制源码：pthread_create()Linux命令：man pthread_create int pthread...

聊聊并发（七）——Java中的阻塞队列

1. 什么是阻塞队列？阻塞队列（BlockingQueue）是一个支持两个附加操作的队列。这两个附加的操作是：在队列为空时，获取元素的线程会等待队列变为非空。当队列满时，存储元素的线程会等待队列可用。阻塞队列常用于生产者和消费者的场景，生产者是往队列里添加元素的线程，消费者是从队列里拿元素的线程。...

聊聊并发-Java中的Copy-On-Write容器

Copy-On-Write简称COW，是一种用于程序设计中的优化策略。其基本思路是，从一开始大家都在共享同一个内容，当某个人想要修改这个内容的时候，才会真正把内容Copy出去形成一个新的内容然后再改，这是一种延时懒惰策略。从JDK1.5开始Java并发包里提供了两个使用CopyOnWrite机制实现...

JavaWeb 并发：FOR UPDATE 实战，监测并解决。

一、前言针对并发，老生常谈了。目前一个通用的做法有两种：锁机制：1.悲观锁；2.乐观锁。但是这篇我主要用于记录我这次处理的经历，另外希望能看的大神，大牛，技师者，学长，兄长，大哥们能在评论中发表自己的看法和解决技巧等。二、故事是这样的一个表，暂且叫 wallet,其中3个字段是...

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