Database - Mongodb Test

Test Instructions :

1. The Test is 1hr duration.
2. The Test Paper consists of 30 questions. The maximum marks are 30.
3. All the questions are multiple choice question type with three options for each question.
4. Out of the three options given for each question, only one option is the correct answer.
5. Each question is allotted 1 mark for each correct response.
6. 0.25 will be deducted for incorrect response of each question.
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   Time Left : 00 : 30    : 00

MongoDB supports the creation of user-defined ascending/descending indexes on a ______ field of a document.

  

  

  

  

MongoDB written in ?

  

  

  

  

To generate pseudo-random data to use for a keyfile, issue the following __________ command.

  

  

  

  

Point out the correct statement :

  

  

  

  

Indexes are typically available in ______ or located sequentially on disk.

  

  

  

  

To provide high availability and data consistency, in a production sharded cluster, each shard is a :

  

  

  

  

Point out the wrong statement :

  

  

  

  

_______ adds numbers to return the sum, or adds numbers and a date to return a new date.

  

  

  

  

Point out the wrong statement :

  

  

  

  

Select the wrong statement :

  

  

  

  

If you use the localhost exception when deploying a new MongoDB system, the first user you create must be in the ________ database.

  

  

  

  

Documents enter a multi-stage __________ that transforms the documents into an aggregated result.

  

  

  

  

MongoDB stores all documents in :

  

  

  

  

A query _______ consists of a combination of query, sort, and projection specifications.

  

  

  

  

What would be the maximum document size for results of mapreduce operation ?

  

  

  

  

_______ returns the remainder of the first number divided by the second.

  

  

  

  

Which of the following operator is not very selective ?

  

  

  

  

MongoDB supports fixed-size collections called ____________ collections.

  

  

  

  

Which of the field is reserved for use as a primary key ?

  

  

  

  

Which of the following flag can be set by mongo shell

  

  

  

  

If your storage system does not support snapshots, you can copy the files directly using :

  

  

  

  

The __________ method returns a document that includes a metrics field.

  

  

  

  

Point out the wrong statement :

  

  

  

  

MongoDB provides a ________ index type that supports searching for string content in a collection.

  

  

  

  

________ subtracts two dates to return the difference in milliseconds

  

  

  

  

____________ are operations that process data records and return computed results.

  

  

  

  

A query may include a ___________ that specifies the fields from the matching documents to return.

  

  

  

  

In the mongo shell, you can access the creation time of the ObjectId, using the ______ method..

  

  

  

  

An index cannot cover a query on a _______ collection when run against a mongos if the index does not contain the shard key.

  

  

  

  

Which of the following query is used to generate a new ObjectId, use the ObjectId() constructor with no argument

  

  

  

  

______________ specifies the number of documents to return in each batch of the response from the MongoDB instance.

  

  

  

  

MongoDB process collection of documents using _________ operations.

  

  

  

  

Use __________ to encrypt communication between mongod and mongos components of a MongoDB client as well as between all applications and MongoDB.

  

  

  

  

MongoDB scales horizontally using _________ for load balancing purpose.

  

  

  

  

Sharded clusters snapshots temporarily stop the balancer via :

  

  

  

  

In sharded clusters, delayed members have limited utility when the __________ is enabled.

  

  

  

  

MongoDB uses ______ indexes to index the content stored in arrays.

  

  

  

  

Select the correct statement :

  

  

  

  

To describe the message structure, a ________ like struct is used.

  

  

  

  

Select the correct statement:

  

  

  

  

Setting _______ enables authentication and specifies a key file for the replica set member use to when authenticating to each other.

  

  

  

  

In which format MongoDb store the data.

  

  

  

  

How many types of sharding exist in MongoDB ?

  

  

  

  

Which of the following code is used for successful exit of task ?

  

  

  

  

Select the correct statement :

  

  

  

  

Select the correct statement :

  

  

  

  

An ________ query plan has returned a threshold number of matching results

  

  

  

  

_______ is /srv/mongodb, which specifies where MongoDB will store its data files

  

  

  

  

Which of the following provide acceptable performance levels for multiple mongod instances?

  

  

  

  

GridFS uses a _________ index on the chunks collection for the files_id and n fields.

  

  

  

  

Which of the following sets the database profiler level ?

  

  

  

  

Select the correct statement :

  

  

  

  

Which of the following operation can be optionally used for map reduce ?

  

  

  

  

Point out the correct statement :

  

  

  

  

Select the wrong statement :

  

  

  

  

Point out the wrong statement :

  

  

  

  

MongoDB also supports user-defined indexes on multiple fields called :

  

  

  

  

______ returns true if the first value is less than the second.

  

  

  

  

_____________ is used to initiate relica member set.

  

  

  

  

What is the size of Chunk by default ?

  

  

  

  

Object_Id is similar to _________ key in Relational Databases

  

  

  

  

Which of the following will display complete list of available cursor flags ?

  

  

  

  

In MongoDB, _________ operations modify the data of a single collection.

  

  

  

  

The aggregation pipeline can use ___________ to improve its performance during some of its stages.

  

  

  

  

Select the wrong statement :

  

  

  

  

Which of the following database command is used for mapreduce function ?

  

  

  

  

String expressions, with the exception of ________ only have a well-defined behavior for strings of ASCII characters.

  

  

  

  

Which of the following document configures the threshold which determines whether a query is “slow” for the purpose of the logging system ?

  

  

  

  

Which of the following operation adds a new document to the users collection ?

  

  

  

  

The ________ message is used to update a document in a collection.

  

  

  

  

Ops Manager _________ provides an interface for configuring MongoDB nodes and clusters and for upgrading your MongoDB deployment.

  

  

  

  

Delayed members are a ________ or a running “historical” snapshot of the data set

  

  

  

  

MongoDB indexes use a _______ data structure.

  

  

  

  

The update() method uses the _______ command, which uses the default write concern.

  

  

  

  

Select the wrong statement :

  

  

  

  

_______ may block reads, including those necessary to verify authentication.

  

  

  

  

Select the wrong statement :

  

  

  

  

The agent ships initial sync and oplog data over HTTPS back to:

  

  

  

  

$multiply __________ numbers to return the result.

  

  

  

  

The ______ index is unique and prevents clients from inserting two documents with the same value for the _id field.

  

  

  

  

Select the wrong statement :

  

  

  

  

MongoDB supports the execution of JavaScript code for certain server-side operations like:

  

  

  

  

Use the __________ option to ensure that MongoDB listens for connections from applications on configured addresses.

  

  

  

  

_________ allows only one agent of each type per machine and will remove additional agents.

  

  

  

  

Instance exits cleanly is represented by ___ exit code

  

  

  

  

Replica set configuration requires that the _______ have a value that is consistent among all members of the set.

  

  

  

  

Ops Manager maintains one _____ database for each backed-up replica set

  

  

  

  

Running data aggregation on the ________ instance simplifies application code and limits resource requirements.

  

  

  

  

_______ scaling adds more CPU and storage resources to increase capacity.

  

  

  

  

_______ divides the data set and distributes the data over multiple servers, or shards.

  

  

  

  

$ne returns true if the values are not _______

  

  

  

  

Ops Manager reads directly from the Backup Blockstore database and transfers files either through :

  

  

  

  

Which of the following is used to display the replica set configuration object ?

  

  

  

  

___________ is used to determine whether a query is a covered query .

  

  

  

  

_____ bit builds of mongod enable journaling by default.

  

  

  

  

With ___________ enabled, MongoDB forces all clients to identify themselves before granting access to the server.

  

  

  

  

MongoDB applies the _________ phase, which collects and condenses the aggregated data.

  

  

  

  

Map-reduce uses custom __________ functions to perform the map and reduce operations.

  

  

  

  

Backup can also create snapshots of _________ that are run as single-member replica sets.

  

  

  

  

Select the correct statement :

  

  

  

  

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