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





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 wrong statement :





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.





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





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





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





_____ bit builds of mongod enable journaling by default.





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





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





Sharded clusters snapshots temporarily stop the balancer via :





Point out the wrong statement :





How many types of sharding exist in MongoDB ?





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





What is the size of Chunk by default ?





$ne returns true if the values are not _______





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





$multiply __________ numbers to return the result.





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





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





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





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





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





Point out the correct statement :





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





Select the wrong statement :





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





Point out the correct statement :





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





Select the wrong statement :





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





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





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





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





Select the correct statement :





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





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





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





Which of the following flag can be set by mongo shell





Select the wrong statement :





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





Select the correct statement :





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





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





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





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





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





Select the correct statement :





Point out the wrong statement :





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





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





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





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





In which format MongoDb store the data.





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





Point out the wrong statement :





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





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





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





________ subtracts two dates to return the difference in milliseconds





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





Select the correct statement :





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





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





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





Select the wrong statement :





Which of the following sets the database profiler level ?





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





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





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





MongoDB scales horizontally using _________ for load balancing purpose.





_____________ is used to initiate relica member set.





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





MongoDB stores all documents in :





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





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 will display complete list of available cursor flags ?





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





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





MongoDB supports fixed-size collections called ____________ collections.





Instance exits cleanly is represented by ___ exit code





Select the correct statement :





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





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





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





Select the correct statement:





MongoDB indexes use a _______ data structure.





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





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





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





MongoDB written in ?





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





MongoDB process collection of documents using _________ operations.





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





Object_Id is similar to _________ key in Relational Databases





Point out the wrong statement :





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





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