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What are BulkWrite operations in MongoDB?

When working with huge datasets, the BulkWrite operation in MongoDB allows us to conduct many write operations in a single request, which can dramatically increase speed.

BulkWrite’s “arrayFilters” feature allows us to update select elements inside arrays that meet specified criteria.

How “arrayFilters” work within MongoDB’s BulkWrite operation?

Here’s how “arrayFilters” function within MongoDB’s BulkWrite operation:

1. Creating a BulkWrite object:

   Firstly, in the MongoDB driver code, we first construct an instance of the BulkWrite class to conduct a bulk write operation.
2. Defining update operations:

   Secondly, we can specify the update operations within the BulkWrite object. Each update operation includes the criteria for matching documents and the changes that we want to do.
3. Specifying arrayFilters:

   When constructing an array-based update operation, we can use the “arrayFilters” option to provide requirements for updating certain array members.

   The “arrayFilters” option accepts an array of filter documents, each defining the criteria for matching elements inside the array.
4. Matching array elements:

   The criteria given in the “arrayFilters” section compare the array items in the document. Only the items that meet the criteria will undergo changes.
5. Performing the BulkWrite:

   Once all of the update operations have been defined, we can use the BulkWrite operation to conduct the updates. BulkWrite delivers a single request to MongoDB, which reduces network overhead.

We can change particular items within arrays in numerous documents with a single request by utilizing the BulkWrite operation with the “arrayFilters” option.

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