Free MongoDB Certified DBA Associate Exam C100DBA Exam Practice Test

In which of the following scenarios is sharding not the correct option. Select all that apply.

• The write operations on the collection are low
• The write operations on the collection are very high
• The working set in the collection is expected to grow very large in size
• The collection is a read intensive collection with less working set

To add a new user and enable authentication in MongoDB, which of the following steps need be executed?

• update users collection and restart mongodb
• All of the above
• update users collection and restart mongodb with -auth option
• update users collection and run db.enableAuthenticationQ

Which of the following are valid json documents? Select all that apply.

• {'a':l, 'b':{'b':l, 'c':'foo', 'd':'bar', 'e':[l,2,4]}}
• {'city':'New York', 'population', 7999034, boros:{'queens', 'manhattan', 'staten island', 'the bronx', u 'brooklyn'}}
• {'name':'Fred Flintstone';'occupation':'Miner';'wife':'Wilma'}
• { }

Which of the following needs to be performed prior to initiate backup on a sharded cluster?

• db.stopBalancer( )
• sh.stopServer( )
• db.stopServer( )
• sh.stopBalancer( )

Which operations add new documents to a collection?

• Create
• update
• insert
• delete

A collection and a document in MongoDB is equivalent to which of the SQL concepts respectively?

• Column and Row
• Table and Row
• Database and Table
• Table and Column

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:

• <replicasetid>.oplog.rs
• oplog.rs
• <database>..oplog.rs
• local.oplog.rs

When should we consider representing a one-to-many relationship in an embedded collection instead of separate collection?

• When the many is not very large
• When the many is very large
• Always
• Never

Aggregation Pipelines have a limit of:

• No limit on document and 100 MB RAM
• 2 MB document and no limit on RAM
• 2 MB document and 100 MB RAM
• 16 MB document and 100 MB RAM

What is the use of mongodump and mongorestore tools?

• backup mongodb deployment
• audit mongodb deployment
• performance tune mongodb deployment
• replicate mongodb deployments