1
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‫Durability committee transactions must be persistent in a durable nonvolatile storage.

2
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‫That's what I mean.

3
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‫If I were right and committed a transaction, it better stay there.

4
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‫When it's when when I lost power, if I committed a transaction, I lost power and that it was shut

5
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‫down.

6
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‫If I started, the value better be that that's what durable durable means.

7
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‫Right.

8
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‫So Red S, for example, is not a durable database.

9
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‫It's a in-memory database.

10
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‫Memcache DNA memory database is not durable and it's up to you if your caching stuff, you're just doing

11
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‫stuff for caching, you might really don't care about being durable.

12
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‫Right.

13
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‫So a lot of databases stock these for property and just starting hacking one of them out and then creating

14
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‫a brand new database out of it.

15
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‫So let's talk the durability out.

16
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‫And that just created this in-memory database thing.

17
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‫They have, I think, persistence.

18
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‫I didn't work very closely with the artist, but in memory they have persistence model.

19
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‫I think Cassandra and Mongo DB decided to say, you know what, I don't need consistency.

20
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‫I'm going to give you consistency when you write your query.

21
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‫Right.

22
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‫But you don't is because then you don't have a schema to begin with.

23
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‫Right.

24
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‫There is a lot of things that God relax, not only just the consistency part of it.

25
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‫So the schema nor referential integrity.

26
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‫You don't get indexes, secondary indexes, all that stuff.

27
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‫You don't get any of that.

28
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‫Yeah.

29
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‫So really, that's probably another topic now, equal versus equal, but that's a long video.

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‫You made it.

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‫Thank you so much for watching.

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‫Until the end.

33
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‫All right, guys, I'm going to see the next one.

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‫You guys, they are awesome.