建立索引

blake

1. >>> from pymongo import ASCENDING, DESCENDING
   
2. >>> posts.create_index([("date", DESCENDING), ("author", ASCENDING)])
   
3. u'date_-1_author_1'
   
4. >>> posts.find({"date": {"$lt": d}}).sort("author").explain()["cursor"]
   
5. u'BtreeCursor date_-1_author_1'
   
6. >>> posts.find({"date": {"$lt": d}}).sort("author").explain()["nscanned"]

复制代码