JSON stands for

Which of the following is a valid Replica Set configuration if you want:

1-Have 3 copies of everything

2- That RS3 is never primary

2- That RSI and RS2 can be primary?

You had to see the different configurations, RS3 could be hidden or priority 0 (But not a referee because we need

3 replicas), while RSI and RS2 could NOT have priority 0 or be hidden or anything like that

In a 4-member RS RSO , RSI, RS2 and RS3 + Referee, RSO (primary) falls after some write operations that have

replicated RSI and RS2 (but NOT RS3), who can get up as the new primary?

The configuration comes and in it we see that RS2 has a hidden: true (or a priority: 0, (I don ' t remember)

What is the use of mongodump and mongorestore tools?

In a sharded cluster, from which node does one stop the balancer process before initiating backup?

Which features of relational database management systems were deliberately omitted in MongoDB and help us to obtain horizontal scalability? Check all that apply.

‘$set ' sets the value of

Suposse tou have the following collection with only 2 documents:

If you run an aggregation query and use { $unwind: " $traits " } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?

What does the output x of the following MongoDB aggregation query result into; db.posts.aggregate( [ { $group: { _id; " $author " , x: { $sum: $likes } } } ] )

Write the command(s) are correct to enable sharding on a database " testdb " and shard a collection " testCollection " with _id as shard key.