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There is a model - Post (using mongoose var Post = new Schema({...});). And every time new instance of Post model is created (var post = new Post({...}); post.save(function (error) {...});), the instance is given with an item, called: _id (ObjectId("...")). I know it might be a stupid question, but: as much as database gets larger and larger, is there a limited amount _id or is it infinite?

Ramziddin Makhmudov
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    Possible duplicate of [Possibility of duplicate Mongo ObjectId's being generated in two different collections?](http://stackoverflow.com/questions/4677237/possibility-of-duplicate-mongo-objectids-being-generated-in-two-different-colle) – SlashmanX Dec 08 '15 at 10:28

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There is no "limit" because the value is comprised partially of "a 4-byte value representing the seconds since the Unix epoch"

See this link: https://docs.mongodb.org/manual/reference/object-id/

Matt Evans
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