MongoDB::BulkWrite - MongoDB bulk write interface


version v2.2.2


    use Safe::Isa;
    use Try::Tiny;

    my $bulk = $collection->initialize_ordered_bulk_op;

    $bulk->insert_one( $doc );
    $bulk->find( $query )->upsert->replace_one( $doc )
    $bulk->find( $query )->update( $modification )

    my $result = try {
    catch {
        if ( $_->$isa("MongoDB::WriteConcernError") ) {
            warn "Write concern failed";
        else {
            die $_;


This class constructs a list of write operations to perform in bulk for a single collection. On a MongoDB 2.6 or later server with write command support this allow grouping similar operations together for transit to the database, minimizing network round-trips.

To begin a bulk operation, use one these methods from MongoDB::Collection:

Ordered Operations

With an ordered operations list, MongoDB executes the write operations in the list serially. If an error occurs during the processing of one of the write operations, MongoDB will return without processing any remaining write operations in the list.

Unordered Operations

With an unordered operations list, MongoDB can execute in parallel, as well as in a nondeterministic order, the write operations in the list. If an error occurs during the processing of one of the write operations, MongoDB will continue to process remaining write operations in the list.


collection (required)

The MongoDB::Collection where the operations are to be performed.

ordered (required)

A boolean for whether or not operations should be ordered (true) or unordered (false).


A boolean for whether or not operations should bypass document validation. Default is false.



    $view = $bulk->find( $query_document );

The find method returns a MongoDB::BulkWriteView object that allows write operations like update or remove, constrained by a query document.

A query document is required. Use an empty hashref for no criteria:

    $bulk->find( {} )->remove; # remove all documents!

An exception will be thrown on error.


    $bulk->insert_one( $doc );

Queues a document for insertion when "execute" is called. The document may be a hash reference, an array reference (with balanced key/value pairs) or a Tie::IxHash object. If the document does not have an _id field, one will be added to the original.

The method has an empty return on success; an exception will be thrown on error.


    my $result = $bulk->execute;
    # Optional write concern:
    my $result = $bulk->execute( $concern );
    # With options
    my $result = $bulk->execute( $concern, $options );

Executes the queued operations. The order and semantics depend on whether the bulk object is ordered or unordered:

  • ordered — operations are executed in order, but operations of the same type (e.g. multiple inserts) may be grouped together and sent to the server. If the server returns an error, the bulk operation will stop and an error will be thrown.

  • unordered — operations are grouped by type and sent to the server in an unpredictable order. After all operations are sent, if any errors occurred, an error will be thrown.

When grouping operations of a type, operations will be sent to the server in batches not exceeding 16MiB or 1000 items (for a version 2.6 or later server) or individually (for legacy servers without write command support).

A write concern is optional, and can either take a pre-constructed WriteConcern object, or the arguments to construct one. For information on write concerns, see MongoDB::WriteConcern.

The options argument is an optional hashref which can contain the following values:

  • session - the session to use for these operations. If not supplied, will use an implicit session. For more information see MongoDB::ClientSession

This method returns a MongoDB::BulkWriteResult object if the bulk operation executes successfully.

Typical errors might include:

  • MongoDB::WriteError — one or more write operations failed

  • MongoDB::WriteConcernError - all writes were accepted by a primary, but the write concern failed

  • MongoDB::DatabaseError — a command to the database failed entirely

See MongoDB::Error for more on error handling.

NOTE: it is an error to call execute without any operations or to call execute more than once on the same bulk object.


  • David Golden <>

  • Rassi <>

  • Mike Friedman <>

  • Kristina Chodorow <>

  • Florian Ragwitz <>


This software is Copyright (c) 2020 by MongoDB, Inc.

This is free software, licensed under:

  The Apache License, Version 2.0, January 2004