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

________ subtracts two dates to return the difference in milliseconds

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

MongoDB scales horizontally using _________ for load balancing purpose.

  

  

  

  

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

  

  

  

  

Select the correct statement :

  

  

  

  

Point out the correct statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the correct statement :

  

  

  

  

MongoDB supports fixed-size collections called ____________ collections.

  

  

  

  

What is the size of Chunk by default ?

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Object_Id is similar to _________ key in Relational Databases

  

  

  

  

Select the wrong statement :

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

Select the wrong statement :

  

  

  

  

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

  

  

  

  

Sharded clusters snapshots temporarily stop the balancer via :

  

  

  

  

Point out the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

MongoDB indexes use a _______ data structure.

  

  

  

  

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

  

  

  

  

Select the wrong statement :

  

  

  

  

Which of the following operator is not very selective ?

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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.

  

  

  

  

$ne returns true if the values are not _______

  

  

  

  

MongoDB process collection of documents using _________ operations.

  

  

  

  

Which of the following flag can be set by mongo shell

  

  

  

  

Select the correct statement :

  

  

  

  

Instance exits cleanly is represented by ___ exit code

  

  

  

  

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

  

  

  

  

MongoDB stores all documents in :

  

  

  

  

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

  

  

  

  

Which of the following sets the database profiler level ?

  

  

  

  

Point out the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the correct statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

In which format MongoDb store the data.

  

  

  

  

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

  

  

  

  

Select the correct statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

_____________ is used to initiate relica member set.

  

  

  

  

_____ bit builds of mongod enable journaling by default.

  

  

  

  

Select the correct statement :

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Point out the wrong statement :

  

  

  

  

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

  

  

  

  

MongoDB written in ?

  

  

  

  

How many types of sharding exist in MongoDB ?

  

  

  

  

Select the wrong statement :

  

  

  

  

$multiply __________ numbers to return the result.

  

  

  

  

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

  

  

  

  

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 is used to display the replica set configuration object ?

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the correct statement:

  

  

  

  

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

  

  

  

  

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

  

  

  

  

Select the wrong statement :

  

  

  

  

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