What is the maximum number of parameters passed to $in query in MongoDB?

Question

What is the maximum number of parameters passed to $in query in MongoDB?

Answer 1

Looks like there is no limitation.

I did a small test.

1) Collection A had - 1 Million simple JSON object {id:,name:}

2) In Collection B, I loaded reference ids of collection A till I got the following exception. I could insert a reference count of 450k of max.

Exception in thread "main" com.mongodb.MongoInternalException: DBObject of size 18388885 is over Max BSON size 16777216

3) I could send 450k of these ids as $in[id1...id450000] and pull the whole list of 450k ids from 1 Million objects in collection A.

Wow! this is more more more than enough for my application :D. MongoDB is really cool.