MongoDB Mastering MongoDB for Beginners (Theory and Projects) - $size Operator

The video tutorial explains the size operator in MongoDB, which is used to check if a field in a document contains an array with a specified number of elements. It demonstrates how to apply the size operator in queries to filter documents based on array size. The tutorial provides examples using fields like 'quantity' and 'tags' and discusses the benefits of using the size operator for data ingestion in a distributed fashion. The video concludes with a mention of its usefulness in preventing data skew.

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