[$group](group.md) [$unwind](unwind.md) [$type](type.md) [$slice $filter](slice.md) [$bucket](bucket.md) [监测工具](MongoDB%E7%9B%91%E6%B5%8B.md) [灾备](%E7%81%BE%E5%A4%87.md) [某公司架构图](%E6%9F%90%E5%85%AC%E5%8F%B8%E6%9E%B6%E6%9E%84%E5%9B%BE.md) [ObjectId](ObjectId.md)