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Tag Archives: NoSQL

MongoDB Pro Tip: Field Projections

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Did you ever learn that select * from table in RDBMS-land is bad? Of course, you did! If you’re only looking for the email address of a user and not the other 15 columns worth of data, then why ask for that data and incur a penalty? The query select email from user where user_id = 1; is far more ...

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MongoDB Geo-Spatial Mobile Demo

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Mongo: noun (pl mongo or mongos) – a monetary unit of Mongolia. Equal to one hundredth of a tugrik. Origin from Mongolian “silver” I’ve written about NoSQL DBMS [http://keyholesoftware.com/2012/10/01/is-nosql-the-sql-sequel/]. We know that there are several categories of NoSQL DBMS. MongoDB is a scalable NoSQL document-oriented data store that has built-in geo-spatial indexing. Let’s look at its characteristics and then check ...

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Practical NoSQL experiences with Apache Cassandra

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Most of the backend systems I’ve worked with over the years have employed relational database storage in some role. Despite many application developers complaining about RDBMS performance, I’ve found that with good design and implementation a relational database can actually scale a lot further than developers think. Often software developers who don’t really understand relational databases tend to blame the ...

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SQL to NoSQL : Copy your data from MySQL to Couchbase

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Introduction During my last interactions with the Couchbase community, I had the question how can I easily import my data from my current database into Couchbase. And my answer was always the same: Take an ETL such as Talend to do it Just write a small program to copy the data from your RDBMS to Couchbase… So I have written ...

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Setup MongoDB Replica Set in 4 steps

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Introduction Before going into details of configuring MongoDB replica sets, let me give brief details about same: Replica Set is the feature provided by the Mongodb database to achieve high availability and automatic failover. It is kinda traditional master-slave configuration but have capability of automatic failover. It is basically group/cluster of the mongod instances which communicates, replicates to each other ...

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Making Sense Out of Datomic, The Revolutionary Non-NoSQL Database

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I have finally managed to understand one of the most unusual databases of today, Datomic, and would like to share it with you. Thanks to Stuart Halloway and his workshop! Why? Why?!? As we shall see shortly, Datomic is very different from the traditional RDBMS databases as well as the various NoSQL databases. It even isn’t a database – it ...

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MongoDB Primary Keys Are Your Friend

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All documents in a MongoDB collection have a primary key dubbed _id. This field is automatically assigned to a document upon insert, so there’s rarely a need to provide it. What’s interesting about the _id field is that it is time based. That is, the underlying type of _id, which is ObjectId, is a 12-byte BSON type, and 4 of ...

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MongoDB to CSV

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Every once in a while, I need to give a non-technical user (like a business analyst) data residing in MongoDB; consequently, I export the target data as a CSV file (which they can presumably slice and dice once they import it into Excel or some similar tool). Mongo has a handy export utility that takes a bevy of options, however, ...

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A 3 Step Guide to Getting Started with NoSQL

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I have been looking in to NoSQL databases for few months and would like to share my experience with it. This is a post might help you if you indent to start learning about the NoSQL Databases. I would try to link the resources which I found useful here. Step 1: What is NoSQL? NoSQL DEFINITION: Next Generation Databases mostly ...

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