How to delete mongodb in batches

You can use the following methods to delete documents in MongoDB: 1. The $in operator specifies the list of documents to be deleted; 2. The regular expression matches documents that meet the criteria; 3. The $exists operator deletes documents with the specified fields; 4. The find() and remove() methods first get and then delete the document. Please note that these operations cannot use transactions and may delete all matching documents, so be careful when using them.

Batch deletion of documents in MongoDB

You can use the following methods to delete documents in MongoDB:

1. Use the $in operator

This method uses the $in operator to specify the list of documents to be deleted. For example:

 <code>db.collection.deleteMany({ _id: { $in: [ObjectId("5e878f3309791e8153091cb3"), ObjectId("5e878f4209791e8153091cb4")] }})</code>

2. Use regular expressions

This method uses regular expressions to match and delete documents that meet the criteria. For example:

 <code>db.collection.deleteMany({ name: /abc/ })</code>

3. Use the $exists operator

This method uses the $exists operator to delete documents with the specified field. For example:

 <code>db.collection.deleteMany({ field: { $exists: true } })</code>

4. Use find() and remove() methods

This method first uses the find() method to get the documents to be deleted, and then uses the remove() method to delete them. For example:

 <code>db.collection.find({ name: "John" }).remove()</code>

Notice:

• The batch deletion operation cannot use the transaction.
• The batch deletion operation deletes all matching documents, so be careful when using it.
• When using the $in operator, ObjectId must be converted to the MongoDB ObjectId type using the ObjectId() constructor.

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