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:
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?
To add a new user and enable authentication in MongoDB, which of the following steps need be executed?
Dada una coleccion, cuales devuelve con la siguiente query db.coleccion.find({nombre:"ruben",apellido:"gomez"},{nombre:l,apellido:l,aficion:l});
Which of the following commands will return all the posts with number of likes greater than 100 and less than 200, both inclusive?
Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?
Which of the tags in a replica set configuration specify the operations to be read from the node with the least network latency?
Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?
We can insert multiple documents in bulk using which of the following operations:
What does the following query do when performed on the posts collection? db.posts.update({_id:l},{Title:This is post with ID 1"})
You are in a sharded cluster. What will you do prior to initiating backup in sharded cluster?
Using an arbiter allows one to easily ensure an odd number of voters in replica sets. Why is this important?
Which of the following index would be optimum for the query?
Select all valid. db.test.find( { a : 5, c : 2 })
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TESTED 19 Apr 2024
