Which of the field is reserved for use as a primary key ?
All of the mentioned
In MongoDB, _________ operations modify the data of a single collection.
In sharded clusters, delayed members have limited utility when the __________ is enabled.
None of the mentioned
Select the correct statement :
MongoDB is classified as a NoSQL database
MongoDB favours XML format more than JSON
MongoDB is column oriented database store
Which of the following operator is not very selective ?
If you create the user administrator before enabling access control, MongoDB disables the ________ exception.
none of the mentioned
An ________ query plan has returned a threshold number of matching results
Point out the wrong statement :
The MongoDB Wire Protocol is a simple socket-based, request-response style protocol
For queries that include a sort operation without an index, the server must load all the documents in memory to perform the sort before returning any results
Clients communicate with the database server through a regular TCP/IP socket
Select the wrong statement :
Indexes cannot enforce uniqueness in collection
CRUD stands for create, read, update, and delete
CRUD application is the most simplest application
Map-reduce uses custom __________ functions to perform the map and reduce operations.
Authentication does not require an authentication mechanism
To enable authentication on a sharded cluster, you must enable authentication individually on each component of the cluster
The content of the key file must be the same on all cluster members
In which format MongoDb store the data.
_______ divides the data set and distributes the data over multiple servers, or shards.
MongoDB provides a ________ index type that supports searching for string content in a collection.
To describe the message structure, a ________ like struct is used.
GridFS uses a _________ index on the chunks collection for the files_id and n fields.
Which of the following is used to display the replica set configuration object ?
Object_Id is similar to _________ key in Relational Databases
all of the mentioned
MongoDB Cloud Manager Backup offers point in time recovery of MongoDB replica sets
MongoDB Cloud Manager continually backs up MongoDB replica sets
MMS achieves point in time recovery by storing oplog data
Replica set configuration requires that the _______ have a value that is consistent among all members of the set.
Point out the correct statement :
Config servers are not replica sets
Sharding requires a number of mongod instances with different configurations
The config servers store the cluster’s metadata, while the cluster distributes data among one or more shard servers
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
Query selectivity refers to how well the query predicate excludes or filters out documents in a collection
Query selectivity can determine whether or not queries can use indexes effectively or even use indexes at all
More selective queries match a larger percentage of documents
Each replica set member will act in the role of primary replica only
The primary replica performs all writes and reads by default
Secondaries can also perform read operations, but the data is eventually consistent by default
______ returns true if the first value is less than the second.
Instance exits cleanly is represented by ___ exit code
Sharded clusters snapshots temporarily stop the balancer via :
With ___________ enabled, MongoDB forces all clients to identify themselves before granting access to the server.
If an appropriate index exists for a query, MongoDB cannot use the index to limit the number of documents it must inspect
Indexes support the efficient execution of queries in MongoDB
The index stores the location of a specific field or set of fields, ordered by the value of the field