Find Complete and recently updated Correct Question and answers of MongoDB. All Answers updated regularly with new questions. Upwork MongoDB test answers of 2016.

Question:* In what language(s) is MongoDB supported?

Answer: • All of above.

Question:* Authentication in MongoDB is:

Answer: • Off by default.

Question:* Which of the following statements are true about MongoDB

Answer: • MongoDB does not support transactions but operations are atomic.

Question:* Which of the following is syntactically correct for searching the "posts" collection for a post with the title of "Big News Story"?

Answer: • db.posts.find({title: 'Big News Story'});

Question:* You can write custom MapReduce functions in MongoDB using:

Answer: • Javascript

Question:* The MongoDB database is capable of:

Answer: • Atomic (per document) operations

Question:* What does MongoDB's Sharding provide?

Answer: • All of these

Question:* This replication process is

Answer: • asynchronous

Question:* MongoDB stores documents in structures called

Answer: • BSON objects

Question:* Which of the following would you use to query an inventory collection to get all items of type "food" with price less than $34?

Answer: • db.inventory.find({type: "food", price: {$lt: 34}})

Question:* How can you optimize document storage?

Answer: • (All of these)

Question:* The interactive "mongo" shell interface is based on:

Answer: • JavaScript

Question:* The maximum BSON document size is:

Answer: • 16 megabytes

Question:* Which of the following terms describe MongoDB?

Answer: • Document-oriented DBMS

Question:* Which of the following expressions are valid JSON documents?

Answer: • {Name: "Schoolify", url: 'www.schoolifybd.com'}

Question:* Instead of tables, MongoDB stores data in structures called:

Answer: • Collections

Question:* Which of the following statement are true

Answer: • If you do not specify and _id when doing an insert, the driver will create one for you

Question:* MongoDB's query language uses operators that start with which character?

Answer: • $

Question:* To perform a search on a collection, and obtain a cursor object for the results, use:

Answer: • find()

Question:* MongoDB supports UTF-8 for strings in stored objects and queries:

Answer: • Always

Question:* Which method should be used to create an index on a collection, if it does not already exist?

Answer: • ensureIndex()

Question:* Which statement of the followings could NOT drop an index?

Answer: • db.myCollection.reIndex()

Question:* To create an index for user_name field on user collection, which of the following is the correct syntax?

Answer: • db.user.ensureIndex({user_name:1});

Question:* The map-reduce operation uses a temporary collection for data processing; The benefit of this behavior is that the operations:

Answer: • Can be performed concurrently on the same collection, without affecting the intermediate states

Question:* The currently preferred replication method is called:

Answer: • Replica sets

Question:* TSV files should be expected to contain:

Answer: • Tab-separated text fields

Question:* MongoDB uses GridFS to:

Answer: • Store large files, distributed as smaller pieces

Question:* The aggregation framework is most similar to which facility from the world of relational databases

Answer: • Group by

Question:* To atomically modify and return a single document from a collection, use:

Answer: • findAndModify()

Question:* Which of the following are considered Core MongoDB operations?

Answer: • Create, Read, Update, Delete

Question:* Which feature of mongoDB is used to balance load among multiple machines?

Answer: • Sharding

Question:* Indexes in mongodb are NOT good for:

Answer: • Collections which are write-intensive

Question:* In MongoDB V2.4, what type of JavaScript engine is used to execute all JavaScript on Mongo shell ?

Answer: • V8

Question:* The core database operations in MongoDB are abbreviated as:

Answer: • CRUD

Question:* When Storing large files in MongoDB one is encouraged to use...

Answer: • GridFS

Question:* The binary log of transactions used to recover the database after a crash is called the:

Answer: • Journal

Question:* Which of the following atomic operations would you use to add a value to an array only if it does not already exist in the array?

Answer: • $addToSet

Question:* Which of the following is not a stage in the aggregation pipeline

Answer: • having

Question:* MongoDB uses the acronym TTL to mean:

Answer: • Time To Live

Question:* Which feature of mongoDB is used for data redundancy?

Answer: • Replica Sets

Question:* Indexing

Answer: • Slows down writes that involve the index

Question:* MongoDB's Replication can be in Master-Slave form or _______ form.

Answer: • Replica Sets

Question:* While replication provides data redundancy, journaling is also recommended because:

Answer: • It allows faster, more reliable recovery after a crash

Question:* True or False? MongoDB can have foreign keys.

Answer: • False

Question:* MongoDB can have indexes on Array Elements?

Answer: • True, MongoDB indexes each element of the array.

Question:* What's the difference between `save()` and `insert()` in mongo shell?

Answer: • save() updates the document if if already exists (judges by if they already contains `_id`); inserts if it's new.

Question:* Which platform does MongoDB support?

Answer: • All of above

Question:* MongoDB document names cannot start with the characters:

Answer: • $ or .

Question:* Which of the following binaries handles routing of sharded queries to the proper shard?

Answer: • mongos

Question:* An operation is said to be "idempotent" if it is proven to:

Answer: • Produce consistent results over multiple runs, given the same input

Question:* What do drivers use with protocol on the wire?

Answer: • BSON

Question:* Due to their default behavior, Capped Collections are ideal for storing:

Answer: • Non-vital, chronological records, like logs

Question:* A Priority 0 or "passive" replica member:

Answer: • Cannot become a primary member

Question:* When a Capped Collection becomes full, and a new document is added:

Answer: • The oldest entry is overwritten with the new document

Question:* What is the extra space allocated to document on the disk to prevent moving a document when it grows as the result of update() operations.

Answer: • padding

Question:* "write concern" allows an application to:

Answer: • Observe the success or failure of database writes

Question:* "read preference" affects how an application:

Answer: • Selects a replica set member to read from

Question:* All writes in MongoDB Must go the primary

Answer: • True

Question:* If you have a compound index on multiple fields (a,b,c), you can use it to query on:

Answer: • (a), (a,b), or (a,b,c)

Question:* How many collections are created when use use gridfs to store large files

Answer: • 2

Question:* The equivalent for like %keyword% on mongodb find is:

Answer: • db.collection.find({field:{$regex:{/keyword/},$options:"i"})

Question:* Which of the following is the correct operation to query a document for both 'Football' and "Reading" within the interests data collected from a profile?

Answer: • db.profile.find({interests: {$all : ["Football", "Reading"] }})

Question:* You want to minus one to field foo, what should you use?

Answer: • { $inc : { foo : -1 } }

Question:* How many data types are available in MongoDB?

Answer: • 6

Question:* Which of the following statements are true about the MongoDB Write Consistency model

Answer: • Strongly consistent by default, can be made eventually consistent

Question:* When a replica set election takes place which types of nodes can participate

Answer: • regular, hidden, and arbiters

Question:* What term is use to describe the order that a database stores documents on disk?

Answer: • natural order

Question:* In MongoDB's Geospatial Indexing, if you want to create & use index on EARTH, what is NOT TRUE?

Answer: • Specifying in key like { lat : -50, lon : 13 }

Question:* Which datum does MongoDB use for calculating geospatial coordinates?

Answer: • WGS84

Question:* What is the easiest way to do tasks like totaling or averaging field values in MongoDB newer versions?

Answer: • Use Aggregation Framework

Question:* Which of the following is not a BSON serialization type?

Answer: • Hash table

Question:* A property used to address servers based on their real-world locations is called:

Answer: • Data-center awareness

Question:* You cannot use characters among /\. "*<>:|? in database names, in release version

Answer: • >=2.2

Question:* MongoDB queries return a limited size (or "threshold") of results by default, usually:

Answer: • 101

Question:* What is the minimum number of mongod instances that may make up a replica set?

Answer: • 1

Question:* Suppose you have a collection foo with an index created using the statement db.foo.ensureIndex({a:1, b:-1, c:1}). Which of the following queries could use the index

Tuesday, December 15, 2015

MongoDB test answers of 2016.

Question:* In what language(s) is MongoDB supported?

Answer: • All of above.

Question:* Authentication in MongoDB is:

Answer: • Off by default.

Question:* Which of the following statements are true about MongoDB

Answer: • MongoDB does not support transactions but operations are atomic.

Question:* Which of the following is syntactically correct for searching the "posts" collection for a post with the title of "Big News Story"?

Answer: • db.posts.find({title: 'Big News Story'});

Question:* You can write custom MapReduce functions in MongoDB using:

Answer: • Javascript

Question:* The MongoDB database is capable of:

Answer: • Atomic (per document) operations

Question:* What does MongoDB's Sharding provide?

Answer: • All of these

Question:* This replication process is

Answer: • asynchronous

Question:* MongoDB stores documents in structures called

Answer: • BSON objects

Question:* Which of the following would you use to query an inventory collection to get all items of type "food" with price less than $34?

Answer: • db.inventory.find({type: "food", price: {$lt: 34}})

Question:* How can you optimize document storage?

Answer: • (All of these)

Question:* The interactive "mongo" shell interface is based on:

Answer: • JavaScript

Question:* The maximum BSON document size is:

Answer: • 16 megabytes

Question:* Which of the following terms describe MongoDB?

Answer: • Document-oriented DBMS

Question:* Which of the following expressions are valid JSON documents?

Answer: • {Name: "Schoolify", url: 'www.schoolifybd.com'}

Question:* Instead of tables, MongoDB stores data in structures called:

Answer: • Collections

Question:* Which of the following statement are true

Answer: • If you do not specify and _id when doing an insert, the driver will create one for you

Question:* MongoDB's query language uses operators that start with which character?

Answer: • $

Question:* To perform a search on a collection, and obtain a cursor object for the results, use:

Answer: • find()

Question:* MongoDB supports UTF-8 for strings in stored objects and queries:

Answer: • Always

Question:* Which method should be used to create an index on a collection, if it does not already exist?

Answer: • ensureIndex()

Question:* Which statement of the followings could NOT drop an index?

Answer: • db.myCollection.reIndex()

Question:* To create an index for user_name field on user collection, which of the following is the correct syntax?

Answer: • db.user.ensureIndex({user_name:1});

Question:* The map-reduce operation uses a temporary collection for data processing; The benefit of this behavior is that the operations:

Answer: • Can be performed concurrently on the same collection, without affecting the intermediate states

Question:* The currently preferred replication method is called:

Answer: • Replica sets

Question:* TSV files should be expected to contain:

Answer: • Tab-separated text fields

Question:* MongoDB uses GridFS to:

Answer: • Store large files, distributed as smaller pieces

Question:* The aggregation framework is most similar to which facility from the world of relational databases

Answer: • Group by

Question:* To atomically modify and return a single document from a collection, use:

Answer: • findAndModify()

Question:* Which of the following are considered Core MongoDB operations?

Answer: • Create, Read, Update, Delete

Question:* Which feature of mongoDB is used to balance load among multiple machines?

Answer: • Sharding

Question:* Indexes in mongodb are NOT good for:

Answer: • Collections which are write-intensive

Question:* In MongoDB V2.4, what type of JavaScript engine is used to execute all JavaScript on Mongo shell ?

Answer: • V8

Question:* The core database operations in MongoDB are abbreviated as:

Answer: • CRUD

Question:* When Storing large files in MongoDB one is encouraged to use...

Answer: • GridFS

Question:* The binary log of transactions used to recover the database after a crash is called the:

Answer: • Journal

Question:* Which of the following atomic operations would you use to add a value to an array only if it does not already exist in the array?

Answer: • $addToSet

Question:* Which of the following is not a stage in the aggregation pipeline

Answer: • having

Question:* MongoDB uses the acronym TTL to mean:

Answer: • Time To Live