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‎docs/_media/github-original.svg‎

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‎docs/data-store/MySQL/sidebar.md‎

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- [MySQL 锁机制](data-store/MySQL/MySQL-Lock.md)
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- [MySQL 分表分库](data-store/MySQL/MySQL-Segmentation.md)
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- [MySQL 主从复制](data-store/MySQL/MySQL-Master-Slave.md)
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- [![Redis](https://icongr.am/devicon/redis-original.svg?&size=16)Redis](data-store/Redis/2.readRedis.md)](redis/2.readRedis.md)
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- [![mongoDB](../_media/mongodb-original.svg)mongoDB]( https://redis.io/ )
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- [![ **Elasticsearch** ](../_media/elasticsearch.svg) Elasticsearch]( https://redis.io/ )
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- [![S3](../_media/amazonwebservices-original.svg)S3]( https://aws.amazon.com/cn/s3/ )
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- [![img](../../_media/redis-original.svg?&size=16)Redis](data-store/Redis/2.readRedis.md)
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- [![mongoDB](../../_media/mongodb-original.svg)mongoDB]( https://redis.io/ )
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- [![Elasticsearch](../../_media/elasticsearch.svg) Elasticsearch]( https://redis.io/ )
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- [![S3](../../_media/amazonwebservices-original.svg)S3]( https://aws.amazon.com/cn/s3/ )
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- FastDFS(OSS)
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- **单体架构**
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- [缕清各种Java Logging](logging/Java-Logging.md)
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- Spring Boot
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- Spring Cloud
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- **面向服务架构**
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- [![message](../_media/message.svg) 消息中间件](message-queue/readMQ.md)
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- [![Nginx](../_media/nginx-original.svg)Nginx](nginx/nginx.md)
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- [![message](../../_media/message.svg) 消息中间件](message-queue/readMQ.md)
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- [![Nginx](../../_media/nginx-original.svg)Nginx](nginx/nginx.md)
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- **工程化与工具**
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- [![Maven](https://icongram.jgog.in/fontawesome/maxcdn.svg?&size=16)Maven](logging/logback简单使用.md)
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- [![Git](../_media/git-original.svg?&size=16) Git](logging/logback简单使用.md)
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- [![Maven](https://icongr.am/fontawesome/maxcdn.svg?&size=16)Maven](logging/logback简单使用.md)
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- [![Git](../../_media/git-original.svg?&size=16) Git](logging/logback简单使用.md)
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- Sonar
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- **大数据**
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- HDFS
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- web调优
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- DB调优
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- **其他**
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- [![Linux](https://icongram.jgog.in/devicon/linux-original.svg?&size=16)Linux](linux/linux.md)
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- [![]( https://icongram.jgog.in/entypo/key.svg?&size=16)设计模式](design-pattern/readme.md)
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- [![Linux](../../_media/linux-original.svg)Linux](linux/linux.md)
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- [![]( https://icongr.am/entypo/key.svg?&size=16)设计模式](design-pattern/readme.md)
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- **Links**
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- [![Github](https://icongram.jgog.in/simple/github.svg?color=808080&size=16)Github](https://github.com/jhildenbiddle/docsify-tabs)
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- [![Blog](https://icongram.jgog.in/simple/aboutme.svg?colored&size=16)My Blog](https://www.lazyegg.net)
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- [![Github](../../_media/github-original.svg)Github](https://github.com/jhildenbiddle/docsify-tabs)
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- [![Blog](https://icongr.am/simple/aboutme.svg?colored&size=16)My Blog](https://www.lazyegg.net)

‎docs/design-pattern/Singleton-Pattern.md‎

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- 单例模式保证了系统内存中该类只存在一个对象，节省了系统资源，对于一些需要频繁创建销毁的对象，使用单例模式可以提高系统性能
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- 当想实例化一个单例类的时候，必须要记住使用相应的获取对象的方法，而不是使 用new
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- 单例模式使用的场景：需要频繁的进行创建和销毁的对象、创建对象时耗时过多或 耗费资源过多(即:重量级对象)，但又经常用到的对象、工具类对象、频繁访问数 据库或文件的对象(比如数据源、session工厂等)
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[设计模式前传——学习设计模式前要知道的](https://mp.weixin.qq.com/s?__biz=MzIwOTIxNTg0OQ==&mid=2247483861&idx=1&sn=4f9fc68764f529b768d936425d4f6984&chksm=977609d3a00180c519b587e27929f32beb75a493b293610ab3378569e8182a647e406e34e73a&token=1499331349&lang=zh_CN#rd)

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‎docs/interview/MySQL-FAQ.md‎

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B-Tree 中的每个节点根据实际情况可以包含大量的关键字信息和分支，如下图所示为一个 3 阶的 B-Tree：
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![索引](https://tva1.sinaimg.cn/large/007S8ZIlly1gg1de1fj9qj30ou08aaas.jpg)
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每个节点占用一个盘块的磁盘空间，一个节点上有两个升序排序的关键字和三个指向子树根节点的指针，指针存储的是子节点所在磁盘块的地址。两个关键词划分成的三个范围域对应三个指针指向的子树的数据的范围域。以根节点为例，关键字为17和35，P1指针指向的子树的数据范围为小于17，P2指针指向的子树的数据范围为17~35，P3指针指向的子树的数据范围为大于35。
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‎docs/sidebar.md‎

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- **Java基础**
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- **数据存储和缓存**
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- [![MySQL](https://icongr.am/devicon/mysql-original.svg?&size=16)MySQL](data-store/MySQL/readMySQL.md)
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- [![Redis](https://icongr.am/devicon/redis-original.svg?&size=16)Redis](data-store/Redis/2.readRedis.md)
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- [![mongoDB](https://icongr.am/devicon/mongodb-original.svg?&size=16)mongoDB]( https://redis.io/ )
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- [![ **Elasticsearch** ](https://icongr.am/simple/elasticsearch.svg?&size=16) Elasticsearch]( https://redis.io/ )
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- [![S3](https://icongr.am/devicon/amazonwebservices-original.svg?&size=16)S3]( https://aws.amazon.com/cn/s3/ )
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- [FastDFS(OSS)]( https://github.com/happyfish100/fastdfs )
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- [![MySQL](https://icongr.am/devicon/mysql-original.svg?&size=25)MySQL](data-store/MySQL/readMySQL.md)
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- [![Redis](https://icongr.am/devicon/redis-original.svg?size=25)Redis](data-store/Redis/2.readRedis.md)
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- [![mongoDB](https://icongr.am/devicon/mongodb-original.svg?&size=25)mongoDB]( https://redis.io/ )
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- [![ **Elasticsearch** ](https://icongr.am/simple/elasticsearch.svg?&size=20) Elasticsearch]( https://redis.io/ )
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- [![S3](https://icongr.am/devicon/amazonwebservices-original.svg?&size=25)S3]( https://aws.amazon.com/cn/s3/ )
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- **直击面试**
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- [![](https://icongr.am/material/basket.svg?size=25)Java集合面试集](interview/Collections-FAQ.md)
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- [![](https://icongr.am/devicon/mysql-original-wordmark.svg?size=25)MySQL面试集](interview/MySQL-FAQ.md)
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- [![](https://icongr.am/jam/flower.svg?size=25)Spring面试集](interview/Spring-FAQ.md)
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- **设计模式**
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- [![](https://icongr.am/jam/alien.svg?size=25)设计模式前传](design-pattern/Design-Pattern-Overview.md)
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- [单例模式](design-pattern/Singleton-Pattern.md)
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- [工厂模式](design-pattern/Factory-Pattern.md)
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- [装饰模式](design-pattern/Decorator-Pattern.md)
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- [代理模式](design-pattern/Proxy-Pattern.md)
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- [观察者模式](design-pattern/Observer-Pattern.md)
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- [适配器模式](design-pattern/Adapter-Pattern.md)
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- [责任链模式](design-pattern/Chain-of-Responsibility-Pattern.md)
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- **单体架构**
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- [缕清各种Java Logging](logging/Java-Logging.md)
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- [hello logback](logging/logback简单使用.md)
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- [![Linux](https://icongr.am/devicon/linux-original.svg?&size=16)Linux](linux/linux.md)
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- SHELL
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- TCP与HTTP
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- [![](https://icongr.am/entypo/key.svg?&size=16)设计模式](design-pattern/readme.md)
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- **直击面试**
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- [Java集合面试集](interview/Collections-FAQ.md)
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- [MySQL面试集](interview/MySQL-FAQ.md)

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