Hey Katharina, There are many interesting links in the below Nosql news ....
All the best Andy ---------- Forwarded message ---------- From: "NoSQL Weekly" <[email protected]> Date: Apr 23, 2015 17:30 Subject: NoSQL Weekly - Issue 230 To: <[email protected]> Cc: Email not displaying correctly? View it in your browser. <http://us2.campaign-archive1.com/?u=72f68dcee17c92724bc7822fb&id=57c1430be7&e=7965148edf> Welcome to issue 230 of NoSQL Weekly. Let's get straight to the links this week. *From Our Sponsor* <http://NoSQLWeekly.us2.list-manage1.com/track/click?u=72f68dcee17c92724bc7822fb&id=8152feb1c8&e=7965148edf> Want to work on new projects? Try out a new stack? Join Hired and discover new opportunities from over 2,000 pre-approved tech companies around the US and UK. Join today! <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=8c6206c70e&e=7965148edf> *News* Announcing Linkurious Enterprise – The first data visualization platform for graph databases <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=c6398b8646&e=7965148edf> Linkurious has announced the public release of Linkurious Enterprise, the first data visualization platform for graph databases. Linkurious Enterprise helps organizations extract insights from their graph data in a safe and collaborative way. CenturyLink Acquires Orchestrate <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=f65043ed34&e=7965148edf> Amazon's AWS Quietly Acquired NoSQL Database Migration Startup Amiato In May 2014 <http://NoSQLWeekly.us2.list-manage1.com/track/click?u=72f68dcee17c92724bc7822fb&id=eb8fe0d21f&e=7965148edf> *Articles, Tutorials and Talks* Call me maybe: MongoDB stale reads <http://NoSQLWeekly.us2.list-manage1.com/track/click?u=72f68dcee17c92724bc7822fb&id=7a2bef5d31&e=7965148edf> In this post, we'll see that Mongo's consistency model is broken by design: not only can "strictly consistent" reads see stale versions of documents, but they can also return garbage data from writes that never should have occurred. The former is (as far as I know) a new result which runs contrary to all of Mongo's consistency documentation. The latter has been a documented issue in Mongo for some time. We'll also touch on a result from the previous Jepsen post: almost all write concern levels allow data loss. Neo4j 2.2: Performance and Scaling <http://NoSQLWeekly.us2.list-manage1.com/track/click?u=72f68dcee17c92724bc7822fb&id=1017151eb6&e=7965148edf> The Neo4j 2.2 release was largely focused on infrastructure improvements to achieve much better performance and scalability. In this session, Philip Rathle (VP of Products) and Andreas Kollegger (Product Experience Designer) talk about how the release improved Cypher speed, read scaling, write scaling, and usability. Building your first application with MongoDB: Creating a REST API using the MEAN Stack - Part 2 <http://NoSQLWeekly.us2.list-manage1.com/track/click?u=72f68dcee17c92724bc7822fb&id=5197c3cb49&e=7965148edf> In the first part of this blog series, we covered the basic mechanics of our application and undertook some data modeling. In this second part, we will create tests that validate the behavior of our application and then describe how to set-up and run the application. Creating Multi-Game Highscore Lists <http://NoSQLWeekly.us2.list-manage1.com/track/click?u=72f68dcee17c92724bc7822fb&id=cb47fdbd17&e=7965148edf> I just came across a question about how to create highscore lists or leaderboards in ArangoDB, and how they would work when compared to Redis sorted sets. This post tries to give an answer on the topic and also detailed instructions and queries for setting up highscore lists with ArangoDB. The additional section "Extensions" explains slightly more advanced highscore list use cases like multi-game highscore lists, joining data and maintaining a "last updated" date. Couchapp Tutorial and How to: Chatty <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=fed0b433d3&e=7965148edf> Couchapp tutorial on how to build secure web applications, using Apache CouchDB in a 3-Tier Single Server Architecture. Building a Distributed Fault-Tolerant Key-Value Store <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=5d0226cc60&e=7965148edf> Implementing a Fault-Tolerant Distributed Key-Value Store is by no means an simple task, and the implementation here described is far from ready for production use. It shows, however, the essential pieces found in these kind of NoSQL databases, tackling the fundamental issues found in these systems. ToroDB PgDay Paris 2015 <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=c76576fe9d&e=7965148edf> ToroDB is a document oriented, Mongo-compatible, open-source database built on top of PostgreSQL. ToroDB implements the MongoDB protocol, and is thus compatible with MongoDB applications. This means it supports the advanced MongoDB query language, and MongoDB language updates. And it's all open source and running on top of PostgreSQL. Analyze accelerometer data with Apache Spark and MLlib <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=853c0d8e7d&e=7965148edf> This post explains how to predict user's physical activity (like walking, jogging, sitting...) using Spark, the Spark-Cassandra connector and MLlib. Using Multiple NoSQL Database Models with Orchestrate and Node.js <http://NoSQLWeekly.us2.list-manage1.com/track/click?u=72f68dcee17c92724bc7822fb&id=e14a93eda0&e=7965148edf> Redis RAM Ramifications - Part I <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=7ab7cd11c1&e=7965148edf> *Interesting Projects, Tools and Libraries* SocketPouch <http://NoSQLWeekly.us2.list-manage1.com/track/click?u=72f68dcee17c92724bc7822fb&id=fe92a816ee&e=7965148edf> Plugin to allow PouchDB and CouchDB to sync over WebSockets, using Engine.io. neo4jcontrol <http://NoSQLWeekly.us2.list-manage1.com/track/click?u=72f68dcee17c92724bc7822fb&id=b6132c02da&e=7965148edf> System Tray tool for common tasks on a local Neo4j server. smartdb <http://NoSQLWeekly.us2.list-manage1.com/track/click?u=72f68dcee17c92724bc7822fb&id=cb95ec93d4&e=7965148edf> CouchDB library for Node.js with advanced entity and cache support. flynn <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=0f6289637c&e=7965148edf> flynn is a book scanning app which saves the added books and enables library search. It optionally supports syncing with a remote CouchDB. DELI <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=ee5f0ff56a&e=7965148edf> DELI is a secondary index for NoSQL systems. It currently supports global indexing and is applicable for HBase alike NoSQL systems where write performance is optimized through a LSM tree structure. speedbump <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=3516d74f71&e=7965148edf> A Redis-backed rate limiter in Go. GoCqlTable <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=2886a98662&e=7965148edf> GoCqlTable is a wrapper around the GoCql-driver that seeks to simplify working with the Cassandra database in Golang projects. *New Releases* Couchbase Server 4.0 Developer Preview <http://NoSQLWeekly.us2.list-manage2.com/track/click?u=72f68dcee17c92724bc7822fb&id=851601fd31&e=7965148edf> This early release comes with many great enhancements, including new query interface with SQL for Documents (codename:N1QL), brand new indexing for low latency queries with Global Secondary Indexing (GSI), a revolutionary new architecture for scalability named Multi-Dimensional Scaling, simplified security and compliance, and many more... OrientDB 2.1 RC1 <http://NoSQLWeekly.us2.list-manage1.com/track/click?u=72f68dcee17c92724bc7822fb&id=64ecaaa30c&e=7965148edf> Orient Technologies has released the first release candidate of OrientDB 2.1: 104 resolved issues and even more exciting innovative improvements! *Upcoming Events and Webinars* Webinar: Building Apps with Couchbase Mobile on iOS <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=80e6f8881d&e=7965148edf> Join James Nocentini, Developer Advocate for Couchbase, who will introduce the Couchbase Lite iOS SDK. In this webinar you'll learn why a document oriented database in your app speeds development, different techniques to make the best use of the iOS SDK, and more. Webinar: Your Master Data is a Graph: Are You Ready? <http://NoSQLWeekly.us2.list-manage2.com/track/click?u=72f68dcee17c92724bc7822fb&id=9a73483457&e=7965148edf> As you tackle your ongoing Master Data Management challenges, it's important to keep a few things in mind: Hierarchies don't really exist Relational isn't about relationships Foreign keys aren't relationships, but constraints It's crazy, isn't it? Join Master Data Management expert Karen Lopez and Neo Technology's Kami Nixon as they discuss today's MDM requirements and explore the companies that are getting MDM right. Cassandra at Venmo - New York, NY <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=736ea04eec&e=7965148edf> In this talk, we'll examine using Cassandra, modeling some data and using composite columns to aggregate our data based on expected query patterns. We'll explore how composite columns allow us to filter data by taking advantage of how columns are stored alphanumerically on disk. We'll observe how the data is represented and how that differs from how the data is stored internally. Then we'll dig into the details of how Cassandra performs writes and reads on a single node, and talk about the commit log, memtable, and SSTables. Finally, we'll conclude with a war story about how switching compaction strategies cut our query times in half. Neo4j Graph Gist Special - London, United Kingdom <http://NoSQLWeekly.us2.list-manage.com/track/click?u=72f68dcee17c92724bc7822fb&id=f3dd5122c2&e=7965148edf> This month we're going to shine the spot light on Graph Gists - a cool tool for creating one page documents that describe and model your domain in a live Neo4j graph. David Johnson, a participant in the recent winter competition will be joining us to show off some of his graph gists and we'll look over some other ones and maybe even create our own one if there's time. 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