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MongoDB C100DBA certification exam consists of 60 multiple-choice questions that need to be completed within 90 minutes. C100DBA exam is available in English, Chinese, Japanese, and Korean languages. C100DBA exam can be taken online, and the candidate can schedule the exam at a time and date that is convenient for them. C100DBA Exam Fee is $150, and the candidate needs to achieve a minimum score of 65% to pass the exam.
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Certification JN0-1102 Exam is a Juniper Networks certification exam. It covers a variety of topics and the percentage of those topics can be found from the Juniper Networks certification webpage.
NEW QUESTION # 144
The MongoDB explain() method does not support which of the following verbosity mode:
Answer: D
NEW QUESTION # 145
In a replica set with a primary and two secondaries, what should the write concern be set to so only a single node is required to acknowledge a write operation before it is deemed successful?
Answer: B
Explanation:
MongoDB write concern defines the level of acknowledgment requested for a write. Setting the numeric value w: 1 means that a write is considered acknowledged after the primary has accepted it; no secondary acknowledgment is required. In a replica set with one primary and two secondaries, those secondaries can replicate the operation asynchronously after the client has already received success. That configuration is represented by { writeConcern: { w: 1 } }, making option D correct. The numeric type matters: w can be specified as an integer count or certain strings such as " majority " , but the string " 1 " is not the intended numeric node count shown by the question. Options B and C also omit the w field structure expected inside a write concern document. The durability trade-off is important: a w:1 write can be acknowledged before any secondary has replicated it, so a sudden primary failure before replication may result in that write being rolled back after failover. If the workload requires stronger durability, w: " majority " is commonly used. For exactly one acknowledging node, however, the correct setting is D.
Study Guide reference/topic:Cluster Reliability and Data Resilience - write concern, w acknowledgments, replica-set durability, and rollback risk.
NEW QUESTION # 146
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?
Answer: D
NEW QUESTION # 147
An employees collection contains documents with fields such as _id, name, age, department, and salary.
A database administrator needs to run a query that will return ONLY the name and age fields for all employees.
Which query meets this requirement?
Answer: A
Explanation:
The first argument to find() is the query filter and the second argument is the projection. Because the requirement applies to every employee, the filter must be an empty document {}. The projection must include name and age while explicitly suppressing _id. MongoDB includes _id by default even in inclusion projections, so { name: 1, age: 1 } would return three fields: _id, name, and age. Adding _id: 0 is the documented exception that allows _id to be excluded from an otherwise inclusion-style projection. Option C therefore produces exactly the requested fields. Options A and B mistakenly place projection-like expressions in the filter position, which would cause MongoDB to search for documents where those fields literally match the specified values rather than controlling returned fields. Option D is close but violates the word "ONLY" because _id remains present. Projection design can also reduce network traffic and, when a suitable index covers both the predicate and projected fields, can contribute to covered-query plans. For this requirement, however, the essential syntax is find({}, {name:1, age:1, _id:0}), so C is correct.
Study Guide reference/topic:MongoDB Architecture and Core Operations - find(), filters, projections, inclusion fields, and _id exclusion.
NEW QUESTION # 148
What command will successfully start the mongod daemon with all default settings as a background task?
Answer: B
Explanation:
The --fork option starts mongod in daemon mode so the server process continues in the background. When -- fork is used, MongoDB requires diagnostic output to be redirected through a logging destination such as -- logpath or --syslog; the process cannot simply detach while continuing to use the normal foreground output stream. Option C supplies both --fork and a valid log path, while leaving the other server settings at their normal defaults unless they are configured elsewhere. Option A explicitly sets the default port but does not satisfy the logging requirement associated with --fork. Option B treats the literal word default as a filesystem path and does not provide the required log destination. Option D uses an unsupported --default switch. In production, MongoDB packages commonly use service managers such as systemd, and a configuration file is usually preferred over manually launching mongod with a long list of command-line options. Nevertheless, among the commands shown, C is the one that correctly daemonizes the server process and provides the logging configuration required for a successful fork.
Study Guide reference/topic:MongoDB Architecture and Core Operations - mongod startup, background execution, logging, and server configuration.
NEW QUESTION # 149
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