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CouchDB Weekly News, September 1, 2016

Releases Apache CouchDB 2.0 Release Candidate 4 : You can download the latest release candidate from http://couchdb.apache.org/release-candidate/2.0/ . Files with -RC in their name a special release...

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7 Questions About Data Lakes and Hadoop, Answered by Dan Graham

We had a Q&A session with Dan about Data Lakes and Hadoop, to get the scoop on what he’ll present at Teradata PARTNERS Conference , and here’s what we discovered 1. What is the biggest opportunity...

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PostgreSQL moves up one rank at the expense of MongoDB

byPaul Andlinger, 1 September 2016 Tags : DB-Engines Ranking , MongoDB , PostgreSQL PostgreSQL passed MongoDB and ranks 4th, only behind the big three DBMS Oracle, mysql and SQL Server. In the...

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A little bit of Cloudant love

PromoWe thought this might be just the time to remind developers amongst you of the call to sign up now for a free IBM Cloudant cloud services trial . Cloudant is a fully managed NoSQL cloud database...

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[MongoDB]Update更新数据

Update操作只作用于集合中存在的文档。MongoDB提供了如下方法来更新集合中的文档: db.collection.update()db.collection.updateOne() New in version 3.2db.collection.updateMany() New in version 3.2db.collection.replaceOne() New in version...

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LinuxCentOS7安装PostgreSQL9.3

前言如题,本篇blog记录一下在linux CentOS...

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sql语言及sql分类

Sql的分类DDL(*)(Data Definition Language):数据定义语言,用来定义数据库对象:库、表、列等; DML(**)(Data Manipulation Language):数据操作语言,用来定义数据库记录(数据); DCL(Data Control Language):数据控制语言,用来定义访问权限和安全级别; DQL(*****)(Data Query...

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浅谈数据挖掘(概论)

前言:学习资料的来源均出自,《图解机器学习》-杉山将,中国工信出版集团。《数据挖掘导论》-戴红,清华大学出版书,数据挖掘算法原理与实现。...

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5 things you need to know about Hadoop Vs Apache Spark

Listen in on any conversation about big data, and you’ll probably hear mention of Hadoop or Apache Spark. Here’s a brief look at what they do and how they compare. 1: They do different things. Hadoop...

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Meet Tyler Michael

We wanted to spread the word that we have added some new faces to Modulus. Meet Tyler. He is our DevOps Engineer, and we've been lucky enough to have him on the Modulus team. With that being said, get...

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Handling large data sets at scale

Millions of people search for ideas on Pinterest every day. Since launchingsearch guides two years ago, we’re now handling two billion search queries every month. A core component of our search stack...

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虚拟专家小组会:NoSQL数据库的现状

要点: 通过被企业所采用的情况了解NoSQL数据库的现状。阅读讨论的情况,从中了解在做基于NoSQL的应用开发时,一些有助于提高开发人员生产力的工具; 理解多模型数据库的概念,以及多模型数据库与混合持久化方法的相对优劣之处; 如何结合使用NoSQL数据库和大数据技术(例如Hadoop和Spark)解决大数据的问题; 学习如何将NoSQL数据库与微服务、Docker等容器技术等其它新兴趋势相集成。...

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Primary Index v/s Secondary Index

In this very short post, I will give an overview of primary and secondary indexes in Databases. DISCLAIMER: I am an Oracle employee, and the views/opinions expressed in the below article are purely my...

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Miscellaneous HBase tips

I'm new(ish) to HBase so here are a few notes I've jotted down over the last few months. Basically, Spark is great at what it does, but if you need to look something up while processing an element,...

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[Cassandra教程] (一)我们为什么选择了Cassandra

原创声明: 本文为原创文章 如需转载需要在文章最开始显示本文原始链接 为了更好的阅读体验,请回 源站 查看文章。有任何修改、订正只会在源站体现 最后更新时间:2016年08月28日 Cassandra 简介 Facebook 产生,并且一开始用来存放“收件箱”, 后来貌似迁移到HBase并将其捐献给Apache 设计思想结合了AWS的DynamoDB + Google BigTable...

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hbase原理分析

1. 介绍 HBase是一个构建在HDFS上的分布式列存储系统,基于Google BigTable模型开发的,是典型的key/value系统。支持海量结构化数据存储、横向扩展、高可用 2. hbase数据模型 hbase以表的方式在HBase存储数据的。表是由行和列构成的,所有的列是从属于某一个列族的。行和列的交叉点称之为cell,cell是版本化的。cell的内容是不可分割的字节数组。...

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Implementing a Serverless AWS IoT Backend with AWS Lambda and Amazon DynamoDB

Ed Lima Cloud Support Engineer Does your IoT device fleet scale to hundreds or thousands of devices? Do you find it somewhat challenging to retrieve the details for multiple devices?AWS IoT provides a...

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Mongodb的亿万级数据集合中提取字段的所有不同值集合

对于互联网公司来说,随着业务的不断发展,后台保存的各种数据也会越来越多,在这篇文章中,简单讲述一下自己在工作过程中遇到的一个小的统计需求工作,希望对有需要的人有所帮助。 需求:需要统计我们后台数据库(Mongodb)保存了多少用户手机号码,数据库集合中的每条记录都有一个手机号码,但是不同记录的手机号码可能是相同的,但是这里的数据库集合数据量较大,将近六七千万记录的级别。...

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阿里云宣布开放开源AliSQL数据库,超大并发、针对秒杀优化

继开源跨平台开发框架Weex之后,阿里巴巴再次宣布另一个重大开源项目AliSQL。8月9日,在2016云栖大会·北京峰会上,阿里云宣布启动AliSQL数据库开源项目。该版本性能优于社区版mysql 70%左右,可帮助中小企业和开发者提升数据运营能力。阿里云方面表示欢迎大家共同参与开源项目,在使用的同时也贡献智慧,为数据库行业带来更多进步。...

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使用ogg来进行业务系统割接的必查项目

前几天在qq群里惜总聊天时,说起了n年前使用ogg来进行业务系统割接时,遇到的一个坑. 具体坑不说了,只说由这个坑总结出来的一个使用ogg来进行业务系统割接的必查项目: 1.割接开始前,需要检查源头数据库中各个业务表的trandata情况,若是存在没有trandata的表,需要停止割接,进行原因分析. 注意: 1.该必查项目也适用于使用hvr逻辑复制软件进行业务系统割接的情况....

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