Bulk.find.hint()

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Tip

Starting in version 3.2, MongoDB also provides the db.collection.bulkWrite() method for performing bulk write operations.

Description描述

Bulk.find.hint()

New in version 4.2.1.

Sets the hint option that specifies the index to support the Bulk.find() for:

The option can take an index specification document or the index name string.

If you specify an index that does not exist, the operation errors.

Bulk.find.hint() has no effect on Bulk.find.removeOne()

Example示例

Create an example collection orders:

db.orders.insert([
   { "_id" : 1, "item" : "abc", "price" : NumberDecimal("12"), "quantity" : 2, "type": "apparel" },
   { "_id" : 2, "item" : "jkl", "price" : NumberDecimal("20"), "quantity" : 1, "type": "electronics" },
   { "_id" : 3, "item" : "abc", "price" : NumberDecimal("10"), "quantity" : 5, "type": "apparel" },
   { "_id" : 4, "item" : "abc", "price" : NumberDecimal("8"), "quantity" : 10, "type": "apparel" },
   { "_id" : 5, "item" : "jkl", "price" : NumberDecimal("15"), "quantity" : 15, "type": "electronics" }
])

Create the following indexes on the example collection:

db.orders.createIndex( { item: 1 } );
db.orders.createIndex( { item: 1, quantity: 1 } );
db.orders.createIndex( { item: 1, price: 1 } );

The following bulk operations specify different index to use for the various update/replace document operations:

var bulk = db.orders.initializeUnorderedBulkOp();
bulk.find({ item: "abc", price: { $gte: NumberDecimal("10") }, quantity: { $lte: 10 } }).hint({item: 1, quantity: 1}).replaceOne( { item: "abc123", status: "P", points: 100 } );
bulk.find({ item: "abc", price: { $gte: NumberDecimal("10") }, quantity: { $lte: 10 } }).hint({item: 1, price: 1}).updateOne( { $inc: { points: 10 } } );
bulk.execute();

To view the indexes used, you can use the $indexStats pipeline:

db.orders.aggregate( [ { $indexStats: { } }, { $sort: { name: 1 } } ] )

See also参阅