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I'm looking for the proper way to remove all elements from an array field (across all documents) in Mongodb - these appear to be equivalent, which is recommended: (or perhaps some other way?)
db.collection.update({}, { $pull : { 'myArray': {} }}, {multi:true} ) or
db.collection.update({}, { $set : {'myArray': [] }} , {multi:true} ) 
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To delete all documents that match a deletion criteria, pass a filter parameter to the deleteMany() method. The method returns a document with the status of the operation. For more information and examples, see deleteMany() .
In MongoDB, the $unset operator is used to delete a particular field. The value specified in the $unset expression does not make any impact on the operation. The $unset has no effect when the field does not exist in the document. name of the column or field to be deleted.
The $set variant will be faster as the $pull will have to do calculations on arrays. I am actually not even certain whether it will work, as you're not really removing any elements with your query.
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