Free C100DBA Exam braindumps download (C100DBA exam dumps Free)

QUESTION: 31

Given a replica set with five data-bearing members, suppose the primary goes down with operations in its oplog that have been copied from the primary to only one secondary. Assuming no other problems occur, which of the following describes what is most likely to happen?

missing operations will need to be manually re-performed
the secondary with the most current oplog will be elected primary
reads will be stale until the primary comes back up
the primary may roll back the operations once it recovers
the most current secondary will roll back the operations following the election

Answer(s): B

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QUESTION: 32

Which command can be used to rebuild the indexes on a collection in MongoDB?

db.collection.createlndex({relndex:l})
db.collection.reIndex({author:l})
db.collection.relndexQ
db.collection.createIndex({author:l}).reIndex()

Answer(s): C

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QUESTION: 33

What does the totalKeysExamined field returned by the explain method indicate?

Number of documents that match the query condition
Number of index entries scanned
Details the completed execution of the winning plan as a tree of stages
Number of documents scanned

Answer(s): B

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QUESTION: 34

In order to ensure that you can maintain high availability in the face of server failure, you should implement which of the following?

Sharding
Properly defined user roles
Replication
Put indexes on all of your documents
The proper storage engine

Answer(s): C

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QUESTION: 35

Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?

upsert command instead of update command
{update: true, insert: true} as the third parameter of update command
This has to be handled in application code (Node.js, PHP, JAVA, C#, etc.) and cannot be handled in mongo shell query
Specify {upsert : true } as the third parameter of update command

Answer(s): D

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Free C100DBA Exam Braindumps MongoDB Associate Database Administrator Questions 31–35 (page: 8)

QUESTION: 31

QUESTION: 32

QUESTION: 33

QUESTION: 34

QUESTION: 35

Free C100DBA Exam Braindumps
MongoDB Associate Database Administrator Questions 31–35 (page: 8)