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MongoDB Certified DBA Associate Exam (Based on MongoDB 4.4) Sample Questions (Q142-Q147):

NEW QUESTION # 142
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: D


NEW QUESTION # 143
Which option can be used with update command so that a new document gets created if no matching document is found based on the query condition?

Answer: C


NEW QUESTION # 144
Given the following query:
db.load.find({
_id: { $lte: 1000 },
rnd: 1234,
date: { $gte: ISODate( " 2023-01-01 " ) }
}).sort({ date: -1 })
In a compound index that best supports this query, what field should be first field?

Answer: D

Explanation:
The rnd field should lead the compound index because it is the query ' s equality predicate. MongoDB ' s common compound-index design rule is Equality, Sort, Range (ESR): fields tested for exact equality are typically placed first, followed by fields used for sorting and then range predicates, subject to workload- specific selectivity considerations. Here, rnd: 1234 is an equality condition. _id: { $lte: 1000 } is a range condition, and date: { $gte: ... } is also a range condition while the query additionally sorts on date. Leading with rnd sharply narrows the index region that must be scanned before MongoDB handles the sort/range dimensions. Starting with _id or date would place a range-oriented key ahead of the exact-match predicate and generally reduce the efficiency of index bounds for this query shape. The complete optimal key pattern may depend on whether avoiding the sort or maximizing range selectivity matters most, but the question asks only for the first field. Under ESR guidance, that first field is rnd, so option B is correct.
Study Guide reference/topic:Indexing and Query Optimization - compound indexes, selectivity, and the Equality-Sort-Range guideline.


NEW QUESTION # 145
Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

Answer: B


NEW QUESTION # 146
'mongoimport' command is used for

Answer: C


NEW QUESTION # 147
......

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