hint

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n.Hint; ??, ??, ???

vt.Hint

vi.Hint, ??

MongoDB ??() ?? ???

??:MongoDB ?? ??? ????? ????? ?? ? ????? ??? ???? MongoDB? ??? ???? ????? ? ?? ????.

??: ??>db.users.find({gender:"M"},{user_name:1,_id:0}).hint({gender:1,user_name:1})

MongoDB ??() ?? ?

>db.users.find({gender:"M"},{user_name:1,_id:0}).hint({gender:1,user_name:1})
可以使用 explain() 函數(shù)來(lái)分析以上查詢：

>db.users.find({gender:"M"},{user_name:1,_id:0}).hint({gender:1,user_name:1}).explain()