Important Takeaways About $out Stage

$out Stage (aggregation)

The $out stage is a crucial component of the Aggregation Pipeline, it takes the documents returned by the aggregation pipeline and writes them to a specified collection. The returned documents can be written into a new collection by specifying the desired name of the new collection in the $out stage...

$out Stage Syntax

The syntax for the $out stage is given below:...

$out Example

Below we have provided a step-by-step guide, on how to use $out stage in the aggregation pipeline....

Use Cases of $out Stage

The $out stage is employed in various scenarios, including:...

MongoDB $out vs $merge

There is another useful stage that can be used in the MongoDB that works similarly to the $out stage, But the only difference in the usage of both is that $merge does not form any new collection, but stores the query in the existing collection itself....

Important Takeaways About $out Stage

Using the $out stage for querying database efficiently developers can write/store query results in a new collection. If the specified collection does not exist, the $out operator creates a new collection. If the collection specified by the $out operation already exists, then after aggregation completion, the $out stage replaces the original collection with a new one. It can not write results into a capped collection. Sharded collection can not be specified as output collection in the $out stage. Allows deeper exploration and analysis of data while enabling the performance of operations and insightful conclusions....