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.
Start Test

   Time Left : 00 : 30    : 00

Select the correct statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Object_Id is similar to _________ key in Relational Databases

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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.

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the wrong statement :

  

  

  

  

MongoDB written in ?

  

  

  

  

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

  

  

  

  

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

  

  

  

  

MongoDB indexes use a _______ data structure.

  

  

  

  

Select the correct statement :

  

  

  

  

$ne returns true if the values are not _______

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

MongoDB scales horizontally using _________ for load balancing purpose.

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

MongoDB process collection of documents using _________ operations.

  

  

  

  

Select the correct statement :

  

  

  

  

________ subtracts two dates to return the difference in milliseconds

  

  

  

  

_____________ is used to initiate relica member set.

  

  

  

  

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

  

  

  

  

Instance exits cleanly is represented by ___ exit code

  

  

  

  

Select the correct statement:

  

  

  

  

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

  

  

  

  

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

  

  

  

  

How many types of sharding exist in MongoDB ?

  

  

  

  

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

  

  

  

  

Which of the following operator is not very selective ?

  

  

  

  

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 flag can be set by mongo shell

  

  

  

  

Sharded clusters snapshots temporarily stop the balancer via :

  

  

  

  

Select the correct statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

If you create the user administrator before enabling access control, MongoDB disables the ________ exception.

  

  

  

  

Point out the correct statement :

  

  

  

  

MongoDB supports fixed-size collections called ____________ collections.

  

  

  

  

$multiply __________ numbers to return the result.

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the wrong statement :

  

  

  

  

Point out the correct statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Which of the following sets the database profiler level ?

  

  

  

  

In which format MongoDb store the data.

  

  

  

  

MongoDB stores all documents in :

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

Select the correct statement :

  

  

  

  

Point out the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

What is the size of Chunk by default ?

  

  

  

  

_____ bit builds of mongod enable journaling by default.

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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