58 + Mcqs in Replication in MongoDB Page 1 McqOptions

1.	Secondaries apply operations from the primary asynchronously to provide __________ consistency.
A.	strict
B.	strong
C.	eventual
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

2.	For a member to sync from another, both members must have the same value for the _________ setting.
A.	buildIndexes
B.	getIndexes
C.	buildpriIndexes
D.	secondary
Answer» B. getIndexes

Discussion

3.	Replication _______ is a delay between operation on the primary and the application of that operation from the oplog to the secondary.
A.	lag
B.	delay
C.	latency
D.	none of the mentioned
Answer» B. delay

Discussion

4.	MongoDB writes the rollback data to BSON files in the rollback/ folder under the database’s ________ directory.
A.	dbPath
B.	logPath
C.	dataPath
D.	all of the mentioned
Answer» B. logPath

Discussion

5.	The oplog must translate multi-updates into individual operations in order to maintain ____________
A.	availability
B.	idempotency
C.	scalability
D.	secondary
Answer» C. scalability

Discussion

6.	Use _________ from a secondary member and the replication status output to assess the current state of replication.
A.	db.getReplInfo()
B.	db.getReplicationInfo()
C.	rs.printReplicationInfo()
D.	none of the mentioned
Answer» C. rs.printReplicationInfo()

Discussion

7.	When ______________ is true, the mongod instance saves all documents migrated from the shard to the moveChunk directory of the storage.dbPath.
A.	sharding.archiveChunks
B.	sharding.archiveMovedChunks
C.	shards.archiveMovedChunks
D.	rs.syncFrom()
Answer» C. shards.archiveMovedChunks

Discussion

8.	You can use the ________ setting in Replica Set Configuration to disable chained replication for situations where chained replication is causing lag.
A.	chainingAllowed
B.	chainingDisAllowed
C.	chainingAllow
D.	none of the mentioned
Answer» B. chainingDisAllowed

Discussion

9.	You also can force a member never to become primary by setting its priority value to ___________
A.	1
B.	2
C.	3
D.	0
Answer» E.

Discussion

10.	To finish the rolling maintenance operation, step down the primary with the _________ method.
A.	rs.syncFrom()
B.	rs.stepDown()
C.	rs.synchrepl()
D.	secondary
Answer» C. rs.synchrepl()

Discussion

11.	Before mongod creates an oplog, you can specify its size with the __________ option.
A.	oplogSizeMB
B.	oplogSizeGB
C.	opSizeMB
D.	all of the mentioned
Answer» B. oplogSizeGB

Discussion

12.	rs.reconfig() provides a wrapper around the ___________ command.
A.	replSetfinalReconfig
B.	replSetReconfig
C.	replSetReconfiguration
D.	none of the mentioned
Answer» C. replSetReconfiguration

Discussion

13.	________ sets the slaveOk property for the current connection.
A.	rs.reconfig()
B.	rs.slaveOk()
C.	rs.stepDown()
D.	rs.slave()
Answer» C. rs.stepDown()

Discussion

14.	A ______ member maintains a copy of the primary’s data set but is invisible to client applications.
A.	primary
B.	delayed
C.	hidden
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

15.	A second data center hosts one priority 0 member that cannot become ___________
A.	primary
B.	write
C.	view
D.	Secondary
Answer» B. write

Discussion

16.	Which of the following members should be hidden?
A.	Delayed
B.	Hidden
C.	Primary
D.	All of the mentioned
Answer» B. Hidden

Discussion

17.	A delayed member has its priority equal to 0 and hidden equal to ___________
A.	0
B.	flase
C.	true
D.	all of the mentioned
Answer» D. all of the mentioned

Discussion

18.	The standard replica set deployment for production system is a ___-member replica set.
A.	two
B.	three
C.	four
D.	five
Answer» C. four

Discussion

19.	_________ for a replica set is the number of members that can become unavailable and still leave enough members in the set to elect a primary.
A.	Fault tolerance
B.	Reliability
C.	Security
D.	None of the mentioned
Answer» B. Reliability

Discussion

20.	_________ member is used to support dedicated functions, such as backup or reporting.
A.	Hidden
B.	Primary
C.	ViewState
D.	None of the mentioned
Answer» B. Primary

Discussion

21.	To protect your data if your main data center fails, keep at least _______ member in an alternate data center.
A.	one
B.	two
C.	three
D.	none of the mentioned
Answer» B. two

Discussion

22.	Without a primary, a replica set cannot accept ________ operations.
A.	read
B.	write
C.	read write
D.	all of the mentioned
Answer» C. read write

Discussion

23.	_________ sets also allow the routing of read operations to specific machines.
A.	Field
B.	Read
C.	Tag
D.	All of the mentioned
Answer» D. All of the mentioned

Discussion

24.	What should be the priority of member to prevent them from becoming primary?
A.	0
B.	1
C.	2
D.	3
Answer» B. 1

Discussion

25.	During initial sync, mongod will remove the content of the _______
A.	dbPathSync
B.	Path
C.	dbPath
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

26.	In sharded clusters, delayed members have limited utility when the __________ is enabled.
A.	Balancer
B.	Collector
C.	Emitter
D.	None of the mentioned
Answer» B. Collector

Discussion

27.	mongorestore recreates indexes recorded by _____________
A.	bsondump
B.	mongodump
C.	mongostore
D.	all of the mentioned
Answer» C. mongostore

Discussion

28.	Delayed members are a ________ or a running “historical” snapshot of the data set.
A.	“rolling backup”
B.	“roll backup”
C.	“rolling commit”
D.	none of the mentioned
Answer» B. “roll backup”

Discussion

29.	_________ is used to read the contents of the rollback files.
A.	bsondumpdata
B.	bsondp
C.	bsondump
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

30.	By default, an application directs its ____ operations to the primary member.
A.	read
B.	write
C.	read write
D.	all of the mentioned
Answer» B. write

Discussion

31.	How many types of members exist in replica set?
A.	1
B.	2
C.	3
D.	4
Answer» C. 3

Discussion

32.	_________ play a role in the elections that select a primary if the current primary is unavailable.
A.	Arbiters
B.	Replicators
C.	Loggers
D.	None of the mentioned
Answer» B. Replicators

Discussion

33.	Which of the member receives all write operations?
A.	center
B.	secondary
C.	primary
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

34.	If the current primary becomes unavailable, the replica set holds an ______ to choose which of the secondaries becomes the new primary.
A.	election
B.	replication
C.	clasification
D.	none of the mentioned
Answer» B. replication

Discussion

35.	Which of the following may be non-voting or priority 0?
A.	center
B.	secondary
C.	primary
D.	none of the mentioned
Answer» C. primary

Discussion

36.	__________ explicitly override the default logic for selecting a member to replicate from.
A.	replSetSyncFrom
B.	resync
C.	applyOps
D.	isMaster
Answer» B. resync

Discussion

37.	_______ is an internal command that applies oplog entries to the current data set.
A.	replSetSyncFrom
B.	resync
C.	applyOps
D.	isMaster
Answer» D. isMaster

Discussion

38.	The architecture of a replica set affects the set’s _________ and capability.
A.	scalability
B.	capacity
C.	performance
D.	all of the mentioned
Answer» C. performance

Discussion

39.	Which of the command is for master-slave replication only?
A.	replSetSyncFrom
B.	resync
C.	applyOps
D.	isMaster
Answer» C. applyOps

Discussion

40.	__________ sets the member that this replica set member will sync from, overriding the default sync target selection logic.
A.	rs.reconfig()
B.	rs.remove()
C.	rs.stepDown()
D.	rs.syncFrom()
Answer» E.

Discussion

41.	For most replica sets, the hostnames in the _________ field never change.
A.	tag
B.	host
C.	rs
D.	none of the mentioned
Answer» C. rs

Discussion

42.	Delayed members apply operations from the _______ on a delay.
A.	oplog
B.	log
C.	mlog
D.	none of the mentioned
Answer» B. log

Discussion

43.	The names of rollback files have the following form.
A.	<database>.<collection>.<timestamp>.bson.
B.	<database>.<collection>.<tp>.bson.
C.	<database>.<collection>.<timestamp>.json.
D.	None of the mentioned
Answer» B. <database>.<collection>.<tp>.bson.

Discussion

44.	A delayed member may show as 0 seconds behind the primary when the inactivity period on the primary is greater than the ________ value.
A.	slaveDelayTime
B.	slaveDelay
C.	slaveTime
D.	rs.slave()
Answer» C. slaveTime

Discussion

45.	The db.________ method does not display hidden members.
A.	isPrima ry()
B.	isMaster()
C.	Master()
D.	none of the mentioned
Answer» C. Master()

Discussion

46.	In a sharded cluster _______ do not interact with hidden members.
A.	mongod
B.	mongos
C.	mongostore
D.	all of the mentioned
Answer» C. mongostore

Discussion

47.	Use ______ to apply the changes to the new primary after rollback.
A.	mongostore
B.	mongorestore
C.	restore
D.	none of the mentioned
Answer» C. restore

Discussion

48.	Which of the following ddds an arbiter to a replica set?
A.	rs.addArb()
B.	rs.addArbiter()
C.	rs.addtoArb()
D.	all of the mentioned
Answer» B. rs.addArbiter()

Discussion

49.	A replica set can have up to ______ members but only 7 voting members.
A.	10
B.	30
C.	50
D.	70
Answer» E.

Discussion

50.	__________ prints a report of the status of the replica set from the perspective of the secondaries.
A.	rs.printSlaveReplicationInfo()
B.	rs.printReplication()
C.	rs.help()
D.	none of the mentioned
Answer» B. rs.printReplication()

Discussion

Explore topic-wise MCQs in Mongodb.

Secondaries apply operations from the primary asynchronously to provide __________ consistency.

For a member to sync from another, both members must have the same value for the _________ setting.

Replication _______ is a delay between operation on the primary and the application of that operation from the oplog to the secondary.

MongoDB writes the rollback data to BSON files in the rollback/ folder under the database’s ________ directory.

The oplog must translate multi-updates into individual operations in order to maintain ____________

Use _________ from a secondary member and the replication status output to assess the current state of replication.

When ______________ is true, the mongod instance saves all documents migrated from the shard to the moveChunk directory of the storage.dbPath.

You can use the ________ setting in Replica Set Configuration to disable chained replication for situations where chained replication is causing lag.

You also can force a member never to become primary by setting its priority value to ___________

To finish the rolling maintenance operation, step down the primary with the _________ method.

Before mongod creates an oplog, you can specify its size with the __________ option.

rs.reconfig() provides a wrapper around the ___________ command.

________ sets the slaveOk property for the current connection.

A ______ member maintains a copy of the primary’s data set but is invisible to client applications.

A second data center hosts one priority 0 member that cannot become ___________

Which of the following members should be hidden?

A delayed member has its priority equal to 0 and hidden equal to ___________

The standard replica set deployment for production system is a ___-member replica set.

_________ for a replica set is the number of members that can become unavailable and still leave enough members in the set to elect a primary.

_________ member is used to support dedicated functions, such as backup or reporting.

To protect your data if your main data center fails, keep at least _______ member in an alternate data center.

Without a primary, a replica set cannot accept ________ operations.

_________ sets also allow the routing of read operations to specific machines.

What should be the priority of member to prevent them from becoming primary?

During initial sync, mongod will remove the content of the _______

In sharded clusters, delayed members have limited utility when the __________ is enabled.

mongorestore recreates indexes recorded by _____________

Delayed members are a ________ or a running “historical” snapshot of the data set.

_________ is used to read the contents of the rollback files.

By default, an application directs its ____ operations to the primary member.

How many types of members exist in replica set?

_________ play a role in the elections that select a primary if the current primary is unavailable.

Which of the member receives all write operations?

If the current primary becomes unavailable, the replica set holds an ______ to choose which of the secondaries becomes the new primary.

Which of the following may be non-voting or priority 0?

__________ explicitly override the default logic for selecting a member to replicate from.

_______ is an internal command that applies oplog entries to the current data set.

The architecture of a replica set affects the set’s _________ and capability.

Which of the command is for master-slave replication only?

__________ sets the member that this replica set member will sync from, overriding the default sync target selection logic.

For most replica sets, the hostnames in the _________ field never change.

Delayed members apply operations from the _______ on a delay.

The names of rollback files have the following form.

A delayed member may show as 0 seconds behind the primary when the inactivity period on the primary is greater than the ________ value.

The db.________ method does not display hidden members.

In a sharded cluster _______ do not interact with hidden members.

Use ______ to apply the changes to the new primary after rollback.

Which of the following ddds an arbiter to a replica set?

A replica set can have up to ______ members but only 7 voting members.

__________ prints a report of the status of the replica set from the perspective of the secondaries.