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MongoDB Certified DBA Associate Exam (C100DBA) is an important certification exam for professionals who want to validate their skills and knowledge in managing MongoDB databases. It is based on MongoDB 4.4 and tests candidates' skills in various areas of database administration. To prepare for C100DBA exam, candidates should gain a deep understanding of MongoDB, practice working with databases hands-on, and familiarize themselves with the exam format. Passing C100DBA Exam can help professionals advance their careers and open up new opportunities in the field of database administration.

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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q15-Q20):

NEW QUESTION # 15
We can insert multiple documents in bulk using which of the following operations:

Answer: D


NEW QUESTION # 16
Consider the following document:
> db.c.find()
{ "_id" : 12, b : [ 3, 5, 7, 2, 1, -4, 3, 12 ] }
Which of the following queries on the "c" collection will return only the first five elements of the array in the
"b"
field? E.g.,
Document you want returned by your query:
{ "_id" : 12, "b" : [ 3, 5, 7, 2, 1 ] >

Answer: C


NEW QUESTION # 17
A database administrator maintains a MongoDB database that stores scientific papers. A paper with DOI
10.1000/xyz123 is no longer relevant and needs to be removed.
What query should the administrator use to delete the paper with the DOI equal to 10.1000/xyz123?

Answer: A

Explanation:
db.collection.deleteOne() deletes a single document that matches the supplied filter, so the direct operation is db.scientificPapers.deleteOne({ doi: " 10.1000/xyz123 " }). The DOI is the identifying criterion, and no additional filter is required. Option A is dangerous and incorrect: drop() removes the entire collection and its indexes rather than deleting a filtered document. Option B uses findOneAndDelete(), which can delete a single matching document, but the displayed filter also requires a nonexistent or inappropriate field/value pair, scientificPapers: " orders " , so the target document would not match. Option D misunderstands the method signature. The second argument to deleteOne() is an options document for settings such as write concern, collation, or hint; it is not a second query predicate. In production, a unique index on DOI could also ensure that the business identifier is unique and make the deletion highly selective. Among the presented commands, only option C cleanly and correctly deletes the one scientific-paper document identified by the specified DOI.
Study Guide reference/topic:MongoDB Architecture and Core Operations - delete operations, deleteOne(), filters, and collection management.


NEW QUESTION # 18
Consider that the posts collection contains an array called ratings which contains ratings given to the post by various users in the following format:

Which of the following query will return all the documents where the ratings array contains elements that in some combination satisfy the query conditions?

Answer: A


NEW QUESTION # 19
Write the command(s) are correct to enable sharding on a database "testdb" and shard a collection "testCollection" with _id as shard key.

Answer:

Explanation:
sh.enableSharding("testdb") & sh.shardCollection("testdb.testCollection", {_id : 1 }, true )


NEW QUESTION # 20
......

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