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- $limit (aggregation)
$limit (aggregation)¶
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Definition¶
Example¶
Consider the following example:
This operation returns only the first 5 documents passed to it
by the pipeline. $limit
has no effect on the content
of the documents it passes.
Note
When a $sort
immediately precedes a $limit
in
the pipeline, the $sort
operation only maintains the top
n
results as it progresses, where n
is the specified limit, and
MongoDB only needs to store n
items in memory. This optimization
still applies when allowDiskUse
is true
and the n
items
exceed the aggregation memory limit.