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impala impalad broadcast join 广播式关联 partitioned hash join 分区后散列关联
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posted @ 2017-11-04 22:47
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https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj18922.html INNER JOIN operation Specifies a join between two tables with an explicit join clause.
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posted @ 2017-11-04 22:28
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行 支持数据追加 列 频繁进行小部分列查询
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posted @ 2017-11-04 21:56
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不可 Kimball维度建模 维度建模,而非数据建模 文本型度量是对某些事情的描述。虽然以文本方式度量事实是可行的,但是应将其放入维度表中,除非对事实表的每个行,其文本是唯一的。 数据仓库的好坏直接取决于维度属性的设置:DW/BI环境的分析能力直接取决于维度属性的质量和深度。 【简单:易理解 性能好
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posted @ 2017-11-04 21:37
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全依赖 Designs that Violate 1NF CustomerCustomer ID First Name Surname Telephone Number123 Pooja Singh 555-861-2025, 192-122-1111456 San Zhang (555) 403-
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posted @ 2017-11-04 21:22
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posted @ 2017-11-04 20:30
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posted @ 2017-11-04 20:29
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http://storm.apache.org/ 【doing for realtime processing what Hadoop did for batch processing 】 Apache Storm is a free and open source distributed real
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posted @ 2017-11-04 16:28
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posted @ 2017-11-04 13:01
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设函数f在U(a,n)有定义,在a点可导,则根据无穷小增量公式,存在一次多项式 A0+A1(x-a) (A0=f(a), A1=f'(a)) 使得 f(x)=A0+A1(x-a)+o(x-a) 如果f在a点n次可导,那么: 0-能否有n次多项式 P(x)= 1-这样的n次多项式能有几个 张筑生老师
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posted @ 2017-11-04 12:12
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http://www.math.pitt.edu/~xfc/math2370/chap5.pdf
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posted @ 2017-11-04 02:27
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http://math.wallawalla.edu/~duncjo/courses/math113/winter08/notes/9-1_math113.pdf Name What Changes What Doesn’t Translation Position Size, Shape, Ori
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posted @ 2017-11-04 02:22
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http://mathworld.wolfram.com/CongruentMatrices.html Two square matrices and are called congruent if there exists a nonsingular matrix such that where
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posted @ 2017-11-04 02:06
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http://www.oracle.com/technetwork/java/javase/memleaks-137499.html 3.1 Meaning of OutOfMemoryError One common indication of a memory leak is the java.
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posted @ 2017-11-03 23:11
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https://docs.python.org/zh-cn/dev/c-api/intro.html 概述 Python 的应用编程接口(API)使得 C 和 C++ 程序员可以在多个层级上访问 Python 解释器。该 API 在 C++ 中同样可用,但为简化描述,通常将其称为 Python/C
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posted @ 2017-11-03 23:03
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posted @ 2017-11-03 22:25
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https://zh.wikipedia.org/wiki/自修改代码 自修改代码(Self-modifying code)是指程序在运行期间(Run time)修改自身指令。可能的用途有:病毒利用此方法逃避杀毒软件的查杀,反静态分析,反盗版[1] ,单片机程序升级。 在暂存存储器中执行代码的计算机
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posted @ 2017-11-03 22:02
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posted @ 2017-11-03 20:11
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https://docs.oracle.com/javase/9/docs/api/java/util/SortedMap.html A Map that further provides a total ordering on its keys. The map is ordered accord
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posted @ 2017-11-03 20:00
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http://stevekrenzel.com/finding-friends-with-mapreduce
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posted @ 2017-11-03 18:58
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en.wikipedia.org/wiki/Möbius_strip http://mechproto.olin.edu/final_projects/average_jo.html Fabrication The first element of the system we created was
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posted @ 2017-11-03 16:20
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http://thrift.apache.org/ The Apache Thrift software framework, for scalable cross-language services development, combines a software stack with a cod
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posted @ 2017-11-03 10:25
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https://www.elastic.co/guide/en/elasticsearch/guide/current/getting-started.html Elasticsearch is a real-time distributed search and analytics engine.
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posted @ 2017-11-03 08:54
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posted @ 2017-11-03 00:40
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https://cloudxlab.com/blog/real-time-analytics-dashboard-with-apache-spark-kafka/
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posted @ 2017-11-02 22:27
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posted @ 2017-11-02 22:13
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posted @ 2017-11-02 19:59
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x=y x_+_y=0 The bit in any position is the modulo-2 sum of all the bits in the corresponding positions of all other disks.
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posted @ 2017-11-02 19:42
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posted @ 2017-11-02 17:54
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posted @ 2017-11-02 17:46
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https://kubernetes.io/docs/concepts/overview/what-is-kubernetes/ Why do I need Kubernetes and what can it do? At a minimum, Kubernetes can schedule an
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posted @ 2017-11-02 16:37
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https://kubernetes.io/docs/concepts/overview/what-is-kubernetes/ The Old Way to deploy applications was to install the applications on a host using th
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posted @ 2017-11-02 16:33
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selection problem
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posted @ 2017-11-02 15:19
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真实世界的并发编程 https://jyywiki.cn/OS/2022/slides/7.slides#/2/3 高性能计算程序:特点 “A technology that harnesses the power of supercomputers or computer clusters to
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posted @ 2017-11-02 14:53
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编译器的实现 常用C++编译器推荐_w3cschool https://www.w3cschool.cn/cpp/cpp-zxm72ps8.html 常用C++编译器推荐 由 Alma 创建, 最后一次修改 2018-05-15 常用C++编译器推荐 常用C++编译器推荐 由 Alma 创建, 最后
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posted @ 2017-11-02 14:18
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onError: function(e) { let msg = e.toString(); // ReferenceError - JavaScript | MDN https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/
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posted @ 2017-11-02 11:09
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“统计的思维方式是归纳(induction),也就是从数据所反映的现实得到比较一般的模型,希望以此解释数据所代表的那部分世界。这和以演绎(deduction)问哦主的数学思维方式相反,演绎是在一些人为的假定(或者在一个公理系统)之下,推导出各种结论。”
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posted @ 2017-11-02 10:29
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en.wikipedia.org/wiki/Java_Message_Service Messaging is a form of loosely coupled distributed communication, where in this context the term 'communica
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posted @ 2017-11-02 09:26
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en.wikipedia.org/wiki/Message-oriented_middleware Message-oriented middleware (MOM) is software or hardware infrastructure supporting sending and rece
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posted @ 2017-11-02 09:22
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HDFS 压缩性能最优、扫描速度最快;不支持随机访问,仅支持昂贵、复杂的文件查询 HBase适合随机访问 Solr 适合检索需求 HBase访问单个记录的时间为毫秒级别,而HDFS不支持随机访问。 HBase的扫描速度大约是HDFS的1/10-1/8。 HBase 深入浅出 https://www.
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posted @ 2017-11-02 09:08
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