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_________ provides all the privileges of the read role.
(a) delete
(b) update
(c) readWrite
(d) none of the mentioned
Right choice is (c) readWriteEasy explanation: The role provides the ability to modify data on all non-system collections and the system.js collection.
Right choice is (c) readWrite
Easy explanation: The role provides the ability to modify data on all non-system collections and the system.js collection.
See lessWhen connected to a MongoDB instance, mongodump can adversely affect ______ performance.
(a) mdump
(b) mongodump
(c) mongod
(d) all of the mentioned
Right answer is (c) mongodExplanation: If your data is larger than system memory, the queries will push the working set out of memory.
Right answer is (c) mongod
Explanation: If your data is larger than system memory, the queries will push the working set out of memory.
See less_____ is a command-line tool for monitoring network use.
(a) bwm-ng
(b) bwm-g
(c) bwm-n
(d) bwm-ngs
Correct choice is (a) bwm-ngThe explanation: If you suspect a network-based bottleneck, you may use bwm-ng to begin your diagnostic process.
Correct choice is (a) bwm-ng
The explanation: If you suspect a network-based bottleneck, you may use bwm-ng to begin your diagnostic process.
See lessMongoDB requires a filesystem that supports ______ on directories.
(a) fsynconce()
(b) fsync()
(c) sync()
(d) all of the mentioned
Right choice is (b) fsync()To explain I would say: HGFS and Virtual Box’s shared folders do not support this operation.
Right choice is (b) fsync()
To explain I would say: HGFS and Virtual Box’s shared folders do not support this operation.
See lessThe _________ field provides the amount of resident memory in use.
(a) mem.resident
(b) memory.resident
(c) mem.resident
(d) all of the mentioned
Correct choice is (c) mem.residentTo explain: If this exceeds the amount of system memory and there is a significant amount of data on disk that isn’t in RAM, you may have exceeded the capacity of your system.
Correct choice is (c) mem.resident
To explain: If this exceeds the amount of system memory and there is a significant amount of data on disk that isn’t in RAM, you may have exceeded the capacity of your system.
See less“Sharding” a database across many server instances can be achieved with _______________
(a) LAN
(b) SAN
(c) MAN
(d) All of the mentioned
Right answer is (b) SANExplanation: “Sharding” a database across many server instances can be achieved with SQL databases, but usually is accomplished through SANs and other complex arrangements for making hardware act as a single server.
Right answer is (b) SAN
Explanation: “Sharding” a database across many server instances can be achieved with SQL databases, but usually is accomplished through SANs and other complex arrangements for making hardware act as a single server.
See lessWhich of the following code is returned by mongod if a moveChunk operation fails to confirm a commit?
(a) 5
(b) 6
(c) 7
(d) 3
Correct answer is (a) 5Explanation: Exit codes 6 and 7 does not exist.
Correct answer is (a) 5
Explanation: Exit codes 6 and 7 does not exist.
See lessNormalized data models describe relationships using ___________ between documents.
(a) relativeness
(b) references
(c) evaluation
(d) none of the mentioned
The correct choice is (b) referencesThe explanation is: Normalized data models can require more round trips to the server.
The correct choice is (b) references
The explanation is: Normalized data models can require more round trips to the server.
See lessPoint out the wrong statement.
(a) The field names cannot start with the dollar sign ($) character
(b) The field names cannot contain the dot (.) character
(c) The field names cannot contain the null character
(d) None of the mentioned
The correct answer is (d) None of the mentionedFor explanation I would say: Documents have certain restrictions on field names.
The correct answer is (d) None of the mentioned
For explanation I would say: Documents have certain restrictions on field names.
See less____________ is a client or database-generated identifier that uniquely identifies this message.
(a) messageLength
(b) responseTo
(c) requestID
(d) all of the mentioned
Right choice is (c) requestIDExplanation: For the case of client-generated messages, it will be returned in the responseTo field of the OP_REPLY message.
Right choice is (c) requestID
Explanation: For the case of client-generated messages, it will be returned in the responseTo field of the OP_REPLY message.
See less