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()