MongoDB Aggregation Pipelines: Stage Order Is the Win

[ EXECUTIVE TEARDOWN // TL;DR ] Put $match first and on indexed fields — every document eliminated early is one the rest of the pipeline never touches. $lookup is a join: run it late (after match/limit) and index the foreign field, or it degrades to repeated scans. Profile with explain('executionStats') and reorder by the real numbers, not... Weiterlesen