The $group stage supports certain expressions (operators) allowing users to perform arithmetic, array, boolean and other operations as part of the aggregation pipeline. To choose the page to disk method, you just need to set the option allowDiskUse to true like this: db. If it becomes an unavoidable problem you can opt to page to disk, with the only disadvantage that you will wait a little longer because it is slower to work on the disk rather than in memory. You will get an error from the database if you exceed this limit. This is an example of the aggregation pipeline syntax: pipeline = [Īggregation works in memory.
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