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MongoDB 4.4 Change Streams and Experimental Pre-Image 'Support'

Warning - Not for Production Use MongoDB’s source code is available (through an SSPL license) and the Core Server project in MongoDB’s JIRA is publicly accessible, which is where I found this info...

Working around MongoDB Stitch's "max async work queue" limit

MongoDB Stitch is a great way to build apps quickly with your data that’s already managed by MongoDB Atlas. Though these services empower you to focus on development without having to worry about i...

Identifying and Reclaiming Disk Space in MongoDB

A common question when it comes to MongoDB and the (default) storage engine (WiredTiger) is “Why is it after I removed a bunch of documents my free space didn’t increase”? The WiredTiger storage e...

MongoDB Initial Sync Progress Monitoring

Sometimes our replica set members fall off the oplog and the node needs to be resynced. When this happens, an Initial Sync is required, which does the following: Clones all databases except the...

What is MongoDB FTDC (aka. diagnostic.data)

Full Time Diagnostic Data Capture (FTDC) was introduced in MongoDB 3.2 (via SERVER-19585), to incrementally collect the results of certain diagnostic commands to assist MongoDB support with trouble...

Troubleshooting and Fixing Invariant Failure !_featureTracker on MongoDB Startup

I recently found myself troubleshooting another MongoDB startup issue due to potential corruption within a WiredTiger file. As I have previously covered this topic (see “Recovering a WiredTiger col...

Current Date Math in MongoDB Aggregations

A challenge that I’ve had in the past while working with my data in MongoDB has been how to incorporate date math into my aggregations. db.foo.insertMany([ { lastUpdated: new Date(new Date().setDa...

Technical Services Engineering at MongoDB

The goal of this post is to provide a first hand account of what it means to be a Technical Services Engineer at MongoDB, as well as what the journey getting to this point has looked like for me. ...

Hello MongoDB

As of August 13th, I am no longer a System Architect at DAC Group. I have a public post on LinkedIn that got some good traction, but to summarize it was time to move on. I’ve been a software engin...

Troubleshooting a MongoDB Performance Issue

UPDATE (2018-06-28): I actually sent a link to this article to the author of the previous blog post and in her reply she indicates that the improvements to cache management and checkpoint areas wer...