MongoDB hint() function
Translation results：
hint
UK[hɪnt] US[hɪnt]
n. Hint; clue, sign; prompt, precaution; trace amount
vt.hint
vi.hint, hint
MongoDB hint() functionsyntax
Function:Although the MongoDB query optimizer generally works very well, you can also use hints to force MongoDB to use a specified index.
Syntax: >db.users.find({gender:"M"},{user_name:1,_id:0}).hint({gender:1,user_name: 1})
MongoDB hint() functionexample
>db.users.find({gender:"M"},{user_name:1,_id:0}).hint({gender:1,user_name:1})
可以使用 explain() 函数来分析以上查询：
>db.users.find({gender:"M"},{user_name:1,_id:0}).hint({gender:1,user_name:1}).explain()Popular Recommendations
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