Free MongoDB C100DBA Practice Exam with Questions & Answers | Set: 3

What does the following query do when performed on the posts collection? db.posts.update({_id:l},{Title:This is post with ID 1"})

The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:

Consider the following documents:

You perform the following query;

How many documents will be updated by the query?

Which of the following index would be optimum for the query?

Select all valid. db.test.find( { a : 5, c : 2 })

Which mongodb tool is used to report details on number of database operations in MongoDB?

What read preference should your application use if you want to read from the primary under normal circumstances but allow reads from secondaries when a primary is unavailable?

You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest. Which comparison order is used?

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

In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal. What should be the value of j?

Which mongodb tool is used to report details on number of database operations in MongoDB?