Optimized way of Querying in MongoDB using $in vs $or

Question

Implementing an application that looks up a table for mail id presence from a list of around 10 email ids. Tried using $or and $in.

$in seems to give better performa

Answer 1

$or operator is logical operator where you can define your own login but $in operator is Comparison operator where you can compare you can not put your on logic.

Syntax of $in:

{ field: { $in: [, , ...  ] } }

Example:

db.account.find( { qty: { $in: [ 5, 15 ] } } )

Syntax of $or:

{ $or: [ {  }, {  }, ... , {  } ] }

Example:

db.account.find( { $or: [ { quantity: { $lt: 20 } }, { price: 10 } ] } )

Note: Account is your collection name