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Category: MongoDB

Enabling TTL on MongoDB GridFS

November 12, 2021 Koen Leave a comment

Anything you store in MongoDB’s GridFS is stored in 2 collections. For instance if your files are loaded in a…

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Posted in: Database, Javascript, MongoDB Filed under: Database, Javascript, MongoDB

Compile and install MongoDB on Raspberry PI

March 10, 2017 Koen 44 Comments

A 32 bit version of Raspbian is currently the most common OS that runs on a Raspberry PI. RPI 3…

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Posted in: Database, Hacks, MongoDB, UNIX/Linux Filed under: Database, Errors, Hacks, MongoDB, UNIX/Linux

Join Array in MongoDB

April 18, 2016 Koen Leave a comment

Since version 3.2 you can use the $lookup to perform the equivalent of left outer joins in MongoDB. While you…

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Posted in: Database, MongoDB Filed under: Database, MongoDB

When to use MongoDB $and Operator

January 25, 2016 Koen Leave a comment

On the surface, it seems like the $and operator is useless because it is implicitly applied when MongoDB processes each…

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Posted in: Database, MongoDB Filed under: Database, MongoDB

MongoDB Aggregation to Custom Sort

January 21, 2016 Koen 2 Comments

While the MongoDB Aggregation Pipeline can be used to aggregate your data, it is definitely not limited to that and…

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Posted in: Database, MongoDB Filed under: Database, MongoDB

MongoDB ClassCastException with new GridFS API

January 20, 2016 Koen Leave a comment

Starting with the MongoDB Java API 3.1 a new GridFS API has been added. It is available under the com.mongodb.client.gridfs…

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Posted in: Database, Java, MongoDB Filed under: Database, Errors, Java, MongoDB

Join Query in MongoDB

September 21, 2015 Koen Leave a comment

As a general rule, you should try to avoid joining as much as possible in MongoDB. While in traditional relational…

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Posted in: Database, MongoDB Filed under: Database, MongoDB

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