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$exists checks if a field exists in a document.

createIndex() creates an index on a field in MongoDB.

A capped collection has a fixed size and automatically removes older documents.

$regex matches documents against a regular expression pattern.

db.collection.drop() deletes a collection and its data.

findOne() retrieves a single document from a collection.

$lt stands for less than in a MongoDB query.

The use db command switches to a specified database.

Replication ensures data redundancy and high availability.

updateMany() updates multiple documents in a collection.

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