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

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

Which of the following sets the database profiler level ?

  

  

  

  

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

  

  

  

  

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

  

  

  

  

In which format MongoDb store the data.

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the correct statement :

  

  

  

  

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

  

  

  

  

Select the correct statement :

  

  

  

  

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

  

  

  

  

Select the correct statement:

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

How many types of sharding exist in MongoDB ?

  

  

  

  

Select the wrong statement :

  

  

  

  

Point out the wrong statement :

  

  

  

  

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

  

  

  

  

$ne returns true if the values are not _______

  

  

  

  

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

  

  

  

  

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

  

  

  

  

MongoDB process collection of documents using _________ operations.

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

MongoDB scales horizontally using _________ for load balancing purpose.

  

  

  

  

Instance exits cleanly is represented by ___ exit code

  

  

  

  

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

  

  

  

  

Select the wrong statement :

  

  

  

  

Point out the correct statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

________ subtracts two dates to return the difference in milliseconds

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

What is the size of Chunk by default ?

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

MongoDB stores all documents in :

  

  

  

  

Select the wrong statement :

  

  

  

  

MongoDB indexes use a _______ data structure.

  

  

  

  

Select the correct statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Sharded clusters snapshots temporarily stop the balancer via :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

$multiply __________ numbers to return the result.

  

  

  

  

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

  

  

  

  

Object_Id is similar to _________ key in Relational Databases

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

MongoDB supports fixed-size collections called ____________ collections.

  

  

  

  

Which of the following flag can be set by mongo shell

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Which of the following operator is not very selective ?

  

  

  

  

Select the correct statement :

  

  

  

  

Select the wrong statement :

  

  

  

  

MongoDB written in ?

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the correct statement :

  

  

  

  

Select the wrong statement :

  

  

  

  

_____ bit builds of mongod enable journaling by default.

  

  

  

  

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

  

  

  

  

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

  

  

  

  

_____________ is used to initiate relica member set.

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the correct statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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