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mongodbramdiskhard-drivesolid-state-drive
Sourav
Sourav

Reputation: 504

What is a persistent disk?

I have been doing an online course in MongoDB, however I am frequently coming across a term called "Persistent disk". I have googled it out, but did not get a satisfying answer. Could you please help me out ?

Upvotes: 0

Views: 1280

Answers (1)

David says Reinstate Monica
David says Reinstate Monica

Reputation: 20129

When your application runs (or Mongo in this case), it does all its work in RAM. RAM is not persistent because when you turn off your computer you permanently lose all the information stored in RAM.

Hard drives and SSDs on the otherhand are persistent. If you write something to them, it sticks for good.

So when you tell Mongo to insert a document, it first gets written into RAM, and then eventually gets written to the (persistent) disk. From an AppDev perspective is this all hidden from you and you (generally) just assume its written straight to desk

This is a good video from what I guess to be the Mongo course you're taking that talks about the transition from memory to disk.

Upvotes: 2

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