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Tag Archives: NoSQL

Replica Set Members in Mongodb

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In the previous articles we have discussed many aspects of replica set in mongodb. And in those articles we have talked many things about members. So, what are these members? What is their purpose? Let us discuss about these things in this article. What are members in mongodb? In short terms the members in mongodb are the mongod processes which ...

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How to Use Projection in MongoDB?

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In mongodb, projection means selecting only necessary data rather than selecting the whole data of a document. If a document has 5 fields and you need to show only 3, then select only 3 fields from it. There are a few projection operators that mongodb provides and helps us reach that goal. Let us discuss about those operators in detail below. ...

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Custom Cassandra Data Types

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In the blog post Connecting to Cassandra from Java, I mentioned that one advantage for Java developers of Cassandra being implemented in Java is the ability to create custom Cassandra data types. In this post, I outline how to do this in greater detail. Cassandra has numerous built-in data types, but there are situations in which one may want to ...

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NoSQL – A Quick Guide

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NoSQL is buzz word nowadays among the developers and software professionals. 1. What is NoSQL ? NoSQL database, also called Not Only SQL, is an approach to data management and database design that’s useful for very large sets of distributed data. 2. Where to use NoSQL ? Use NOSQL, When project has unstructured big data that require real-time or offline ...

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NoSQL on Android

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There are various NoSQL solutions for mobile platforms such as the iOS and Android. Here, we will look at Couchbase Lite (CBL – the successor of TouchDB), a lightweight, full-featured, embedded JSON database. Why a full-feature database instead of just a wrapper for a cloud service? Basically, responsiveness. The idea is that the application should always be available to users ...

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Connecting to Cassandra from Java

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In my post Hello Cassandra, I looked at downloading the Cassandra NoSQL database and using cqlsh to connect to a Cassandra database. In this post, I look at the basics of connecting to a Cassandra database from a Java client. Although there are several frameworks available for accessing the Cassandra database from Java, I will use the DataStax Java Client ...

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SharedHashMap vs Redis

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Overview This is a comparison between OpenHFT’s SharedHashMap and a popular key-value store Redis. Any vendor will tell you how great their product is, so I will start by outlining why you wouldn’t use SharedHashMap, before I tell you why it is a “must have” for performant applications.       Why you would use Redis? Redis is a more ...

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Rocking with mongodb on spring boot

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I’m a fan of Spring Boot and here’s my mongodb example project on Spring Boot. Most of the mongodb example projects are so basic that you won’t go far with them. You can search for plain Spring Data examples but they can get much complex than you’d like. So here’s mine. Here’s the pom I’ll use.         ...

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Hello Cassandra

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A colleague recently told me about several benefits of Cassandra and I decided to try it out. Apache Cassandra is described in A Quick Introduction to Apache Cassandra as “one of today’s most popular NoSQL-databases.” The main page for Apache Cassandra states that the “Apache Cassandra database is the right choice when you need scalability and high availability without compromising ...

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Seven Databases in Seven Weeks – Hbase Day 2

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This post is a recap of the second day of Hbase from the Seven Databases in Seven Weeks book. Most of the commands and scripts can be found at GitHub: https://github.com/eyalgo/seven-dbs-in-seven-weeks/tree/master/hbase/day_2 Streaming Script The first thing in day 2 was to download lots of data (big data) and stream it into Hbase. There’s a JRuby script, which I had to ...

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