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

Sharded clusters snapshots temporarily stop the balancer via :

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Instance exits cleanly is represented by ___ exit code

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

________ subtracts two dates to return the difference in milliseconds

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Which of the following operator is not very selective ?

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

Select the correct statement :

  

  

  

  

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

  

  

  

  

_____________ is used to initiate relica member set.

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the correct statement :

  

  

  

  

What is the size of Chunk by default ?

  

  

  

  

Which of the following sets the database profiler level ?

  

  

  

  

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

  

  

  

  

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

  

  

  

  

MongoDB written in ?

  

  

  

  

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

  

  

  

  

Select the correct statement :

  

  

  

  

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

  

  

  

  

Select the correct statement :

  

  

  

  

Which of the following flag can be set by mongo shell

  

  

  

  

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

  

  

  

  

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

  

  

  

  

_____ bit builds of mongod enable journaling by default.

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the wrong statement :

  

  

  

  

In which format MongoDb store the data.

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

How many types of sharding exist in MongoDB ?

  

  

  

  

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

  

  

  

  

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

  

  

  

  

MongoDB process collection of documents using _________ operations.

  

  

  

  

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 ?

  

  

  

  

Point out the correct statement :

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Object_Id is similar to _________ key in Relational Databases

  

  

  

  

Select the correct statement :

  

  

  

  

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

$ne returns true if the values are not _______

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

$multiply __________ numbers to return the result.

  

  

  

  

Select the correct statement:

  

  

  

  

MongoDB indexes use a _______ data structure.

  

  

  

  

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

  

  

  

  

MongoDB stores all documents in :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

MongoDB supports fixed-size collections called ____________ collections.

  

  

  

  

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

  

  

  

  

Point out the correct statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

MongoDB scales horizontally using _________ for load balancing purpose.

  

  

  

  

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

  

  

  

  

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