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不忘初心,方得始终 | mjshen.com Reviews
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第一阶段 一台Mysql服务器,业务都在上面,读读写写变化快,定期备份 优点 响应快 缺点 挂得也快. 第二阶段 一台Mysql主服务器,多台从服务器,读写分离,异步binlog同步 优点 性能提高 有高可用性了 缺点 写有瓶颈,治标不治本. 第三阶段 N台Mysql服务器组,每个组有主从架构,服务器组按照某个维度分库,并且分表 优点 高可用 高性能 缺点 系统处于分布式下,一些分布式的问题就会暴露. 再说读,原来一条查询语句在一个库查询,那分布式下就可能需要查询10个库 当然如果有分库的Hint,可以直接查 ,然后做数据的整合返回客户端 这其实就是一个数据访问层的中间件了,想想如果查询语句当中含有 limit,group by,join 等,那做数据整合的工作会很复杂,并且同时还需要保证效率和准确性。 首先连接池是一个宽泛的概念,我们都知道连接池都是有初始大小,也上限的 为什么要有上限,因为怕被拖垮 ,最大闲置时间等等这些只是 池 的一些配置。 Basic implementation - produces a standard {@code Connection} * object *. Distr...
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1 跳至内容
2 不忘初心,方得始终
3 菜单和挂件
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5 数据库的读与写探讨
6 数据源 连接池 的机制
7 数据库连接池有什么用
8 分页导出引发的数据隔离问题思考
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跳至内容,不忘初心,方得始终,菜单和挂件,近期文章,数据库的读与写探讨,数据源 连接池 的机制,数据库连接池有什么用,分页导出引发的数据隔离问题思考,threejs demo,文章归档,分类目录,clojure,common,java,compiler,https,jetty,leinigen,mysql,plugin,ring,safety,threejs,token,transaction,upload,upload file,写于之前,可能会有地方有缺陷,也是为了将来可以更好得提高打下一些思想基础
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不忘初心,方得始终 | mjshen.com Reviews

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第一阶段 一台Mysql服务器,业务都在上面,读读写写变化快,定期备份 优点 响应快 缺点 挂得也快. 第二阶段 一台Mysql主服务器,多台从服务器,读写分离,异步binlog同步 优点 性能提高 有高可用性了 缺点 写有瓶颈,治标不治本. 第三阶段 N台Mysql服务器组,每个组有主从架构,服务器组按照某个维度分库,并且分表 优点 高可用 高性能 缺点 系统处于分布式下,一些分布式的问题就会暴露. 再说读,原来一条查询语句在一个库查询,那分布式下就可能需要查询10个库 当然如果有分库的Hint,可以直接查 ,然后做数据的整合返回客户端 这其实就是一个数据访问层的中间件了,想想如果查询语句当中含有 limit,group by,join 等,那做数据整合的工作会很复杂,并且同时还需要保证效率和准确性。 首先连接池是一个宽泛的概念,我们都知道连接池都是有初始大小,也上限的 为什么要有上限,因为怕被拖垮 ,最大闲置时间等等这些只是 池 的一些配置。 Basic implementation - produces a standard {@code Connection} * object *. Distr...

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March up!

Ring server jetty 启动. 有人问这个token和一般App Sever的sessionID有什么区别 其实也没有什么区别 我没有用sessionID- -#,其实是当初大意疏漏了,用了也没这个事了。 1浏览器与服务器握个手,告知服务器自己支持的加密方式并且拿到服务器CA证书和一个RSA、公钥S PuKey,然后去校验 CA证书是由一些指定机构颁发的 ,如果有安全隐患就会提示危险 那么基本就是自己签的,像12306。 最近需要form表单提交文件,text复合内容 即multipart/form-data ,首先添加其中间件 wrap-multipart-params. 函数,github Wiki上有写,加入之后会发现request 多了个multipart-params的K-V对. 8212;—————————-说点别的————————-. POST "/upload" request (println request). 使用只要 (csp “PATH/XXX.csp”)即可. 首先根据csp 函数的file参数找到文件,生成一个该文件名的一个Key 也是其生成clj文件的命名空间...

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不忘初心,方得始终

第一阶段 一台Mysql服务器,业务都在上面,读读写写变化快,定期备份 优点 响应快 缺点 挂得也快. 第二阶段 一台Mysql主服务器,多台从服务器,读写分离,异步binlog同步 优点 性能提高 有高可用性了 缺点 写有瓶颈,治标不治本. 第三阶段 N台Mysql服务器组,每个组有主从架构,服务器组按照某个维度分库,并且分表 优点 高可用 高性能 缺点 系统处于分布式下,一些分布式的问题就会暴露. 再说读,原来一条查询语句在一个库查询,那分布式下就可能需要查询10个库 当然如果有分库的Hint,可以直接查 ,然后做数据的整合返回客户端 这其实就是一个数据访问层的中间件了,想想如果查询语句当中含有 limit,group by,join 等,那做数据整合的工作会很复杂,并且同时还需要保证效率和准确性。 首先连接池是一个宽泛的概念,我们都知道连接池都是有初始大小,也上限的 为什么要有上限,因为怕被拖垮 ,最大闲置时间等等这些只是 池 的一些配置。 Basic implementation - produces a standard {@code Connection} * object *. Distr...

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