This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Indexes In MongoDB”. 1. MongoDB indexes use a _______ data structure. a) Hash b) Map c) B-tree d) All of the mentioned 2. Point out the correct statement. a) If an appropriate index exists for a query, MongoDB cannot use the index to … Read more
This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “SQL to Aggregation Mapping Chart”. 1. __________ references the root document, i.e. the top-level document, currently being processed in the aggregation pipeline stage. a) CURRENT b) ROOT c) PRUNE d) All of the mentioned 2. Point out the wrong statement. a) Variables can … Read more
This set of MongoDB Questions for entrance exams focuses on “Pipeline Operators – 2”. 1. $sum is an accumulator operator available only in the _______ stage. a) $group b) $sets c) $accumulator d) None of the mentioned 2. Point out the wrong statement. a) $avg is an accumulator operator available only in the $group stage … Read more
This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Pipeline Operators – 1”. 1. $dayOfMonth returns the day of the month for a date as a number between ________________ a) 1 and 31 b) 1 and 30 c) 1 and 28 d) None of the mentioned 2. Point out the wrong statement. … Read more
This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Map-Reduce and Sharded Collections”. 1. The _____ JavaScript engine allows multiple JavaScript operations to execute at the same time. a) V8 b) V12 c) V7 d) None of the mentioned 2. Point out the correct statement. a) The read phase takes a exclusive … Read more
This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Pipeline and Sharded Collections”. 1. Which of the following returns a substring of a string? a) $subs b) $substring c) $substr d) None of the mentioned 2. Point out the correct statement. a) $substr ends at a specified index position up to a … Read more
This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Pipeline Limits”. 1. Comparison expressions return a boolean except for ________ which returns a number. a) $copy b) $cmp c) $num d) None of the mentioned 2. Point out the correct statement. a) The comparison expressions take two argument expressions and compare both … Read more
This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Pipeline Optimization”. 1. ______ expressions ignores the duplicate entries in each input array and the order of the elements. a) set b) boolean c) aggregate d) none of the mentioned 2. Point out the correct statement. a) To avoid parsing ambiguity if the … Read more
This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Aggregation Mechanics”. 1. Which of the following stages cannot appear multiple times in a pipeline? a) $regex b) $reg c) $match d) $out 2. Point out the correct statement. a) To access variables in expressions, use a string that prefixes the variable name … Read more
This set of MongoDB Multiple Choice Questions & Answers (MCQs) focuses on “Aggregation Operations”. 1. _______ filters the document stream to allow only matching documents to pass unmodified into the next pipeline stage. a) $regex b) $reg c) $match d) None of the mentioned 2. Point out the wrong statement. a) Documents do not pass … Read more
