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w 24-1缓存旁置-2断路器模式 https://msdn.microsoft.com/en-us/library/dn568099.aspx Figure 1 - Using the Cache-Aside pattern to store data in the cache Figure 1 阅读全文
posted @ 2017-01-13 10:53
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posted @ 2017-01-12 23:24
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字符串和整数一一映射的算法 公司每人的英文名不同，现在给每个英文名一个不同的数字编号，怎么设计？ 走ipv4/6 2/32 2/128就够了，把“网段”概念对应到“表或库”，ip有a_e5类，这概念都可以引过来 和 时间 年月日 店铺 sellid marketplaceid amazon 平台参数 阅读全文
posted @ 2017-01-12 19:55
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w公共查询表复制至每一个碎片 http://www.agildata.com/database-sharding/ In the Bookstore example, the Primary Shard Table is the ‘customer’ entity. This is the tabl 阅读全文
posted @ 2017-01-12 18:49
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w横切 http://www.agildata.com/database-sharding/ When Database Sharding is Appropriate Database Sharding is an excellent fit for many types of business 阅读全文
posted @ 2017-01-12 18:48
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w分布式查询、数据聚合、跨碎片join是可且应避免的、自增主键管理、基于-会话/事务/语句-选择碎片、通过-主键/模块/碎片索引-碎片化数据 http://www.agildata.com/database-sharding/ Database Sharding Challenges Due to 阅读全文
posted @ 2017-01-12 18:47
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w将单个服务器上的单个数据库打碎为多个服务器上的单个数据库 http://www.agildata.com/database-sharding/ Database Sharding provides a method for scalability across independent server 阅读全文
posted @ 2017-01-12 17:51
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w主写从读、集群节点间时时内存复制、单表横切纵切、分析报表系统通过服务器联表 http://www.agildata.com/database-sharding/ Database Partitioning Options It has long been known that database p 阅读全文
posted @ 2017-01-12 17:08
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wIO瓶颈 http://www.agildata.com/database-sharding/ What Drives the Need for Database Sharding? Database Sharding is a highly scalable approach for impro 阅读全文
posted @ 2017-01-12 17:06
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w玻璃碎片、0共享 http://www.agildata.com/database-sharding/ The Rise of Database Sharding The concept of Database Sharding has been gaining popularity over t 阅读全文
posted @ 2017-01-12 17:05
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http://blog.sciencenet.cn/home.php?mod=space&uid=287179&do=blog&id=425373 教科书书常用“定义—定理”的体系，先给出数学定义，然后给出若干性质， 从公式 到 公式，逐步推导。有的教科书采用用信号“反褶、平移、相乘、积分”给出几何 阅读全文
posted @ 2017-01-12 14:46
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posted @ 2017-01-12 13:55
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posted @ 2017-01-12 09:18
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posted @ 2017-01-12 09:06
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Monte Carlo methods https://zh.wikipedia.org/wiki/蒙地卡羅方法 通常蒙地卡羅方法可以粗略地分成两类：一类是所求解的问题本身具有内在的随机性，借助计算机的运算能力可以直接模拟这种随机的过程。例如在核物理研究中，分析中子在反应堆中的传输过程。中子与原子核 阅读全文
posted @ 2017-01-11 22:13
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posted @ 2017-01-11 22:05
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posted @ 2017-01-11 16:58
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posted @ 2017-01-10 21:24
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posted @ 2017-01-10 20:02
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posted @ 2017-01-10 16:32
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posted @ 2017-01-10 16:17
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w可以考虑从计算机的“机械性、重复性”特征去设计“低效的”算法。 https://www.codeproject.com/articles/523074/webcontrols/ Online handwriting recognition using multi convolution neura 阅读全文
posted @ 2017-01-10 10:29
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posted @ 2017-01-10 09:51
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posted @ 2017-01-10 09:25
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1 ALTER TABLE ad_keyword_brand 2 ADD CONSTRAINT w1 UNIQUE (keyword,adasin,brand,page_position,country,ad_kind,ad_tag); 阅读全文
posted @ 2017-01-09 17:00
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posted @ 2017-01-06 23:06
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