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RavenDB Map/Reduce Optimization

DZone's Guide to

RavenDB Map/Reduce Optimization

· Database Zone
Free Resource

Learn how to move from MongoDB to Couchbase Server for consistent high performance in distributed environments at any scale.

So I was diagnosing a customer problem, which required me to write the following:

image

This is working on a data set of about half a million records.

I took a peek at the stats and I saw this:

image

You can ignore everything before 03:23, this is the previous index run. I reset it to make sure that I have a clean test.

What you can see is that we start out with a mapping & reducing values. And you can see that initially this is quite expensive. But very quickly we recognize that we are reducing a single value, and we switch strategies to a more efficient method, and we suddenly have very little cost involved in here. In fact, you can see that the entire process took about 3 minutes from start to finish, and very quickly we got to the point where are bottle neck was actually the maps pushing data our way.

That is pretty cool.

Want to deliver a whole new level of customer experience? Learn how to make your move from MongoDB to Couchbase Server.

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Published at DZone with permission of Oren Eini, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

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