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- mongo Shell Methods >
- Collection Methods
Collection Methods¶
| Name | Description |
|---|---|
| db.collection.aggregate() | Provides access to the aggregation pipeline. |
| db.collection.count() | Wraps count to return a count of the number of documents in a collection or matching a query. |
| db.collection.copyTo() | Wraps eval to copy data between collections in a single MongoDB instance. |
| db.collection.createIndex() | Builds an index on a collection. Use db.collection.ensureIndex(). |
| db.collection.getIndexStats() | Renders a human-readable view of the data collected by indexStats which reflects B-tree utilization. |
| db.collection.indexStats() | Renders a human-readable view of the data collected by indexStats which reflects B-tree utilization. |
| db.collection.dataSize() | Returns the size of the collection. Wraps the size field in the output of the collStats. |
| db.collection.distinct() | Returns an array of documents that have distinct values for the specified field. |
| db.collection.drop() | Removes the specified collection from the database. |
| db.collection.dropIndex() | Removes a specified index on a collection. |
| db.collection.dropIndexes() | Removes all indexes on a collection. |
| db.collection.ensureIndex() | Creates an index if it does not currently exist. If the index exists ensureIndex() does nothing. |
| db.collection.find() | Performs a query on a collection and returns a cursor object. |
| db.collection.findAndModify() | Atomically modifies and returns a single document. |
| db.collection.findOne() | Performs a query and returns a single document. |
| db.collection.getIndexes() | Returns an array of documents that describe the existing indexes on a collection. |
| db.collection.getShardDistribution() | For collections in sharded clusters, db.collection.getShardDistribution() reports data of chunk distribution. |
| db.collection.getShardVersion() | Internal diagnostic method for shard cluster. |
| db.collection.group() | Provides simple data aggregation function. Groups documents in a collection by a key, and processes the results. Use aggregate() for more complex data aggregation. |
| db.collection.initializeOrderedBulkOp() | Initializes a Bulk() operations builder for an ordered list of operations. |
| db.collection.initializeUnorderedBulkOp() | Initializes a Bulk() operations builder for an unordered list of operations. |
| db.collection.insert() | Creates a new document in a collection. |
| db.collection.isCapped() | Reports if a collection is a capped collection. |
| db.collection.mapReduce() | Performs map-reduce style data aggregation. |
| db.collection.reIndex() | Rebuilds all existing indexes on a collection. |
| db.collection.remove() | Deletes documents from a collection. |
| db.collection.renameCollection() | Changes the name of a collection. |
| db.collection.save() | Provides a wrapper around an insert() and update() to insert new documents. |
| db.collection.stats() | Reports on the state of a collection. Provides a wrapper around the collStats. |
| db.collection.storageSize() | Reports the total size used by the collection in bytes. Provides a wrapper around the storageSize field of the collStats output. |
| db.collection.totalSize() | Reports the total size of a collection, including the size of all documents and all indexes on a collection. |
| db.collection.totalIndexSize() | Reports the total size used by the indexes on a collection. Provides a wrapper around the totalIndexSize field of the collStats output. |
| db.collection.update() | Modifies a document in a collection. |
| db.collection.validate() | Performs diagnostic operations on a collection. |