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In Pass4suresVCE's website you can free download study guide, some exercises and answers about MongoDB Certification C100DBA Exam as an attempt.
| Section | Objectives |
|---|---|
| Sharding | - Cluster Scaling
|
| Server Administration | - Database Operations
|
| Indexes | - Index Management
|
| Philosophy and Features | - MongoDB Architecture
|
| Application Administration | - Security and Access Control
|
| CRUD Operations | - Data Manipulation
|
| Replication | - Replica Sets
|
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NEW QUESTION # 27
A MongoDB administrator needs to create a new role with only the read privileges for the products database.
What command should the administrator use?
Answer: B
Explanation:
MongoDB custom roles are defined in terms of privileges, and each privilege specifies a resource plus one or more allowed actions. For read/query access, find is a valid privilege action. To represent all normal collections in a specified database, MongoDB uses a resource document with the target database and an empty collection name, for example { db: " products " , collection: " " }. Option B therefore combines the correct resource scope with the find action and does not grant write capability. The distractors confuse built-in role names with privilege actions. read, readWrite, and readAnyDatabase are built-in roles or role concepts, not the appropriate action values for the privileges[].actions list shown here. Likewise, a literal " * " collection value is not the documented database-wide resource form for this custom privilege. In practice, an administrator could also assign MongoDB ' s built-in read role rather than creating a custom role if its permissions exactly match the requirement. Given the specific createRole() choices, however, option B is the technically correct construction.
Study Guide reference/topic:Security, Networking, and Encryption - RBAC, custom roles, resources, and privilege actions.
NEW QUESTION # 28
What is the replication factor for a replicated cluster with 1 primary, 3 secondaries with one of them hidden. The set also has an arbiter?
Answer: C
NEW QUESTION # 29
Below is a sample document of "orders" collection
Answer:
Explanation:
$project
NEW QUESTION # 30
Suposse tou have the following collection with only 2 documents:
If you run an aggregation query and use { $unwind: "$traits" } as the first stage, how many documents will be passed to the next stage of the aggregation pipeline?
Answer: C
NEW QUESTION # 31
You are comparing values of different BSON types in mongodb. You want to compare from lowest to highest. Which comparison order is used?
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