Releasing Dgraph v0.7.1
Dgraph team is super excited to present v0.7.1 of Dgraph. This version is the biggest step we’ve taken towards our production aim of v1.0. We’ve implemented 90% of all the features we had planned in...
View ArticleCouchDB Weekly News, January 5, 2017
Releases PouchDB 6.1.1 is here! Releases in the CouchDB Universe couchbeam 1.4.2 (Erlang) Erlang CouchDB client couchdb-jwt 3.4.0 A Node.js server for managing CouchDB authentication through JSON Web...
View ArticleMongoDB and Ransomware
Recent reports in the news of MongoDB databases being hacked are not new but the ransoms demanded for the return of data is a new twist on an old problem - insecure MongoDB databases. Compose MongoDB...
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MongoDB Ransomware: Not Likely, But How Do You Know?
In this blog post, we’ll look at some of the concerns recently seen around MongoDB ransomware and security issues. Security blogs and magazines have recently been aflutter with the news that a hacker...
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Miles to go ... - Arun Gupta: Microservice using AWS Serverless Application...
Amazon Web Services introduced Serverless Application Model , or SAM, a couple of months ago. It defines simplified syntax for expressing serverless resources. SAM extends AWS CloudFormation to add...
View ArticleMongoDB应用案例：使用 MongoDB 存储商品分类信息
电商业务一个基本的功能模块就是存储品类丰富的商品信息，各种商品特性、参数各异，MongoDB 灵活的文档模型非常适合于这类业务，本文主要介绍如何使用 MongoDB 来存储商品分类信息，内容翻译自 User case Product Catalog 关系型数据库解决方案 上述问题使用传统的关系型数据库也可以解决，比如以下几种方案 针对不同商品，创建不同的表...
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The 5-Minute Interview: Daniel Himmelstein, Postdoctoral Fellow at University...
ByBryce Merkl Sasaki, Aspiring Graphista | January 6, 2017 “This is a really advanced graph algorithm and Cypher nailed it,”said Daniel Himmelstein , a Postdoctoral Fellow at the University of...
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Comparison Between Hadoop 2.x vs Hadoop 3.x
Objective In this tutorial we will discuss about the comparison between Hadoop 2.x vsHadoop 3.x. What are the new features added in Hadoop version 3, is hadoop 2 programs compatible in hadoop 3, what...
View Article全网独家MongoDB Certified DBA Associate考试认证视频
该视频意在让所有学员一次通过考试，避免重复考试而承担的巨额考试费用！ 目前MongDB发展迅猛，有赶超mysql，和oracle看齐的苗头。在这个时候MongoDB也适时的推出了官方的认证考试“MongoDB Certified DBA Associate Level”。 该证书和OCP一样，值得拥有。...
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在OnceIO(Node.JS)中用Redis储存Session
单线程的 Node.js 为了充分利用 CPU 的多核特性，采用了 cluster 模块，利用主从模式，生成与 CPU 核心数量相当的子进程，主进程捕获请求随机分配给子进程处理，并负责子进程的崩溃重启。进程与进程之间是不能共享数据的，如果把 Session 存储在内存里，存储在不同进程的内存中的 Session 将无法共享，Session 认证机制会出现问题。例如，用户 A 认证的过程是由进程 1...
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[源码阅读]Cassandra Nodetool 是如何输出json格式的？
本篇文章的目的就是尝试来阅读以下具体实现的源码。 从哪里入手？ 首先 https://issues.apache.org/jira/browse/CASSANDRA-5977 。在这个issue之中，附带了patch的实现。从path之中，可以看到commitor首先修改了TableStats的代码。 将Cassandra的代码从github clone下来之后，用Eclipse来看。 PS:...
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ApexSQL DBA features 2017
Performance monitoring Baselining Wait stats Deadlock analysis Slowest queries Alerts Server info Custom metrics AlwaysOn monitoring Maintenance periods Query performance Query waits Execution plan...
View ArticleThe Data Day: January 6, 2017
Grow up, data platforms and analytics: it’s time to be an adult For @451Research clients: Machine learning: past, present and yet to come https://t.co/IGSC2jaMPU 2016 in #machinelearning...
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Set Up a MongoDB Replica Set in Under an Hour Using a Bitnami Package
+ Sure, it is easy enough to set up a single copy of an application on your favorite cloud provider. Click a few buttons and away you go. But what if you want to set up a complex, multi-tier...
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More than 10,000 exposed MongoDB databases deleted by ransomware groups
Groups of attackers have adopted a new tactic that involves deleting publicly exposed MongoDB databases and asking for money to restore them. In a matter of days, the number of affected databases has...
View Article3.Nodejs入门-----数据库 Mongdb Nodejs Nodejs教程 数据库
一.传统数据库技术回顾数据库就是存储数据的，那么存储数据就用txt就行了啊，为什么要有数据库？ 理由之1： 数据库有行、列的概念，数据有关系，数据不是散的。 老牌数据库，比如mysql、SQL Server、Oracle、Access。这些数据库，我们管他们叫做结构型数据库。为什么？因为每个表中，都有明确的字段，每行记录，都有这些字段。不能有的行有，有的行没有。...
View ArticleHadoop Weekly Issue #198
02 January 2017 Lots of great content from the last two weeks, including a few year in review posts and new releases of Apache Spark, Apache Kafka, and Apache Flink. In technical posts, there is a...
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Learn About the Replication Feature in MongoDB
In this chapter, we are going to explore the replication feature in MongoDB. The phenomenon of synchronizing data across multiple servers is known as replication. It is an important and useful feature...
View ArticleJDBC入门篇总结 JDBC JDBC入门 JDBC总结
连接JDBC?1、导入jar包。2、加载驱动类不同的数据库对应着不同的驱动类。根据将要连接的数据库类型进行操作。以mysql为例。3、创建连接创建连接时要注意，导入java.sql比较好。原因就是，导入这个包可以对不同的数据库进行操作。也可以针对数据库导入对应的jar包，但是不具有普遍应用。如果需要更换数据库会非常的麻烦。用到了关键字Connection。 具体的java语句 Connection...
View ArticleAmazon引入Athena 难道是 AWS云上Hadoop的终结？
Amazon Web Services准备尝试扩展云计算龙头地位，继续充实其数据基础设施，这次使用的是新的查询服务。 Athena是对Amazon Simple Storage Service或S3中的数据执行SQL查询的数据引擎，它是不断增长的云数据阵容的最新成员。连同一些竞争性的软件包一起，该软件预示着云上数据更多的交互式查询。...
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