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Now that we have mongodb solution up and running in the web with replica sets, we can dive into a certain

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topic that was added with mongodb 4.0, transactions. And you need a replica set an environment

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for transactions to work

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and therefore I couldn't show this earlier in the course but now with the mongodb Atlas deployment

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up and running,

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you can dive into transactions. Now important, for this module

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you need mongodb 4.0

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and currently if you deploy mongodb Atlas and you are in the free tier, you can only use 3.6 there.

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So if you use that free tier, chances are high you are doing that,

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you don't need to upgrade,

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you can just follow along with the videos and then try this out on your own once you eventually make

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the step into building a real app and you therefore are willing to pay something for that

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or until the free tier also supports 4.0

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of course.

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So in this module, we'll dive into transactions and that of course poses one important question,

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what are transactions and then how will we use them? Both will be covered here.