MongoDB Connector for Hadoop with Authentication - Quick Tip
If you are using the MongoDB Connector for Hadoop and you have enabled authentication on your MongoDB database (eg. auth=true) you may find that you are prevented from getting data in to or out of the...
View ArticleJava Using SSL To Connect to MongoDB With Access Control
In this post I've documented the typical steps you need to enable a Java application to connect to a MongoDB database over SSL. Specifically, I show the so-called "one-way SSL" pattern, where the...
View ArticleTracking Versions in MongoDB
I'm honoured to have been asked by Asya to contribute a guest post to her series on Tracking Versions in MongoDB. Here's Asya's full series on the topic, which I recommend reading in order:How to Track...
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Accessing MongoDB data from SQL / ODBC on Windows, using the new BI Connector
[EDIT 05-Apr-2018: MongoDB BI Connector version 2+ uses a different mechanism for connecting to (not using a PostgreSQL driver) - for more info see here] The latest enterprise version of MongoDB (3.2)...
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Accessing MongoDB data using SQL / ODBC on Linux
[EDIT 05-Apr-2018: MongoDB BI Connector version 2+ uses a different mechanism for connecting to (not using a PostgreSQL driver) - for more info see here] In my previous post I showed how generic...
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MongoDB's BI Connector and pushdown of SQL WHERE clauses
[EDIT 05-Apr-2018: MongoDB BI Connector version 2+ uses a much more rich and powerful approach for pushing down SQL clauses to the database - for more info see here] In previous posts I showed how to...
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SHOCKER: XA Distributed Transactions are only Eventually Consistent!
Apologies for the tabloid-trash style headline. It could have been worse, I could have gone with my working title of "WARNING: XA will eat your first-born"! This topic has come up in a few...
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Deploying a MongoDB Replica Set as a GKE Kubernetes StatefulSet
[Part 1 in a series of posts about running MongoDB on Kubernetes, with the Google Kubernetes Engine (GKE). See the GitHub project gke-mongodb-demo for an example scripted deployment of MongoDB to GKE,...
View ArticleConfiguring Some Key Production Settings for MongoDB on GKE Kubernetes
[Part 2 in a series of posts about running MongoDB on Kubernetes, with the Google Kubernetes Engine (GKE). See the GitHub project gke-mongodb-demo for an example scripted deployment of MongoDB to GKE,...
View ArticleUsing the Enterprise Version of MongoDB on GKE Kubernetes
[Part 3 in a series of posts about running MongoDB on Kubernetes, with the Google Kubernetes Engine (GKE). See the GitHub project gke-mongodb-demo for an example scripted deployment of MongoDB to GKE,...
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Deploying a MongoDB Sharded Cluster using Kubernetes StatefulSets on GKE
[Part 4 in a series of posts about running MongoDB on Kubernetes, with the Google Kubernetes Engine (GKE). For this post, a newer GitHub project gke-mongodb-shards-demo has been created to provide an...
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Run MongoDB Aggregation Facets In Parallel For Faster Insight
Introduction MongoDB version 3.4 introduced a new Aggregation stage, $facet, to enable developers to "create multi-faceted aggregations which characterize data across multiple dimensions, or facets,...
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MongoDB Graph Query Example, Inspired by Designing Data-Intensive...
Introduction People who have worked with me recently are probably bored by me raving about how good this book is: Designing Data-Intensive Applications by Martin Kleppmann (O'Reilly, 2016). Suffice to...
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Running a Mongo Shell Script From Within A Larger Bash Script
[EDIT May 2023: The post below was written for the legacy 'mongo' shell but has since been tested with the modern 'mongosh' shell, which behaves the same with no issues.] If you have a Bash script that...
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Some Tips for Diagnosing Client Connection Issues for MongoDB Atlas
Introduction [UPDATE 07-Sep-2020: I've now written an executable binary tool you can run which performs the equivalent of the checks in this blog post to diagnose connectivity issues to Atas or any...
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My Notes on Linux Application Support in ChromeOS (a.k.a. Crostini)
These are my own rough notes from spending a few days studying Chrome OS and its Linux app support on a HP Chromebook 14* I got for free (retails for about £150) when I recently purchased a Google...
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Running MongoDB on ChromeOS (via Crostini)
In my previous post I explored Linux application support in ChromeOS and Chromebooks (a.k.a. Crostini). Of course I was bound to try running MongoDB in this environment, which I found to work really...
View ArticleConverting Gnarly Date Strings to Proper Date Types Using a MongoDB...
Introduction I recently received some example bank payments data in a CSV file which had been exported from a relational database with that database's default export settings. After using mongoimport...
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Rust & MongoDB - Perfect Bedfellows
I've been learning Rust over the last month or so and I'm really enjoying it. It's a really elegant and flexible programming language despite being the most strongly typed and compile-time strict...
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Is Querying A MongoDB View Optimised?
Views in MongoDB appear to database users like read-only collections, ready to be queried in the same way normal collections are. A View is defined by an Aggregation pipeline and when a query is issued...
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MongoDB Data Masking Examples
IntroductionData Masking is a well established approach to protecting sensitive data in a database yet allowing the data to still be usable. There are a number of reasons why organisations need to...
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MongoDB Reversible Data Masking Example Pattern
IntroductionIn a previous blog post I explored how to apply one-way non-reversible data masking on a data-set in MongoDB. Here I will explore why, in some cases, there can be a need for reversible data...
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New MongoDB Aggregations book is out
My book, Practical MongoDB Aggregations, was published this week.The book is available electronically for free for anyone to use at: https://www.practical-mongodb-aggregations.comThis book is intended...
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Achieving At Least An Order Of Magnitude Aggregation Performance Improvement...
IntroductionWhen I started my MongoDB Inc career 8 years ago, the 'bootcamp' project topic I chose for self-learning was to investigate how to speed up aggregations via parallelism. Specifically, I...
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New Paper Version Of Practical MongoDB Aggregations Book Now Available
Just over 2 years ago, I self-published the Practical MongoDB Aggregations eBook, which is also referenced by parts of the MongoDB Manual. Now, there is a MongoDB Inc. officially endorsed paper and...
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