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• _________ is used to view statistics about the query plan for a given query.(a) db.explain()(b) cursor.explain()(c) cursor.explainstats()(d) all of the mentionedI had been asked this question during an interview.This question is from Analyze Query Performance topic in chapter MongoDB CRUD Concepts and Operation of MongoDB
• A ________ query plan has returned a threshold number of matching results.(a) execution(b) unordered(c) ordered(d) none of the mentionedThis question was posed to me during an interview.My query is from Analyze Query Performance in section MongoDB CRUD Concepts and Operation of MongoDB
• _____can modify specific fields of an existing document or documents or replace an existing document entirely, depending on the update parameter.(a) modify()(b) update()(c) find()(d) none of the mentionedI had been asked this question in an online quiz.I'm obligated to ask this question of Analyze Query Performance in division MongoDB CRUD Concepts and Operation of MongoDB
• The update() method uses the _______ command, which uses the default write concern.(a) find(b) read(c) update(d) modifyI have been asked this question during an interview.The query is from Analyze Query Performance topic in division MongoDB CRUD Concepts and Operation of MongoDB
• Point out the correct statement.(a) An equality match on the unique _id field is less selective as it can match at most one document(b) The selectivity of regular expressions depends on the expressions themselves(c) Less selective queries can use indexes effectively or even at all(d) All of the mentionedThis question was addressed to me in an interview.This question is from Analyze Query Performance in portion MongoDB CRUD Concepts and Operation of MongoDB
• The ________ message is used to update a document in a collection.(a) UPDATE(b) OP_UPDATE(c) OP_UPDATES(d) All of the mentionedThis question was posed to me in exam.The query is from Analyze Query Performance topic in portion MongoDB CRUD Concepts and Operation of MongoDB
• ___________ is used to determine whether a query is a covered query.(a) explainstats()(b) explain()(c) explainall()(d) all of the mentionedI have been asked this question in my homework.The origin of the question is Analyze Query Performance in section MongoDB CRUD Concepts and Operation of MongoDB
• With an __________ write concern, MongoDB does not acknowledge the receipt of write operations.(a) Nacknowledged(b) Acknowledgement(c) Acknowledged(d) UnacknowledgedI got this question by my college director while I was bunking the class.This is a very interesting question from Write operations topic in portion MongoDB CRUD Concepts and Operation of MongoDB
• Point out the wrong statement.(a) Query selectivity refers to how well the query predicate excludes or filters out documents in a collection(b) Query selectivity can determine whether or not queries can use indexes effectively or even use indexes at all(c) More selective queries match a larger percentage of documents(d) All of the mentionedThe question was posed to me in final exam.My question comes from Analyze Query Performance in division MongoDB CRUD Concepts and Operation of MongoDB
• Indexes are typically available in ______ or located sequentially on disk.(a) RAM(b) ROM(c) CMOS(d) None of the mentionedThe question was asked by my school teacher while I was bunking the class.The origin of the question is Analyze Query Performance topic in portion MongoDB CRUD Concepts and Operation of MongoDB