MongoDB Test 2
Which mode does the explain() command operate in by default?
Explanation:
A query plan is a series of steps that are followed to find documents that fit the query. The above plan just contains one stage, 'COLLSCAN,' which suggests MongoDB performed a full collection scan in order to respond to the query.
The master's oplog uses the ____ storage size measure .
Explanation:
The master's oplog uses the MB storage size measure.
The $inc key modifier acts with the _____ data type.
Explanation:
The $inc key modifier acts with the numeric data type.
$push is an array operator that adds a key to an array at the ______.
Explanation:
$push is an array operator that adds a key to an array at the end
Which of the following commands has the potential to lock the database?
Explanation:
All of the above
Which of the following statements concerning sharding is correct?
Explanation:
Data is distributed across numerous machines using the sharding technique. To assist installations with huge data sets and high performance operations, MongoDB uses sharding. Large data collections and high-throughput applications can tax a single server's capabilities.
What is the largest Index Key Limit and Number of Indexes per collection?
Explanation:
The largest index key limit and the number of indexes per collection are 1024 bytes and 64 indexes
What is the maximum document size in MongoDB?
Explanation:
The maximum document size in Mongodb is 16 MB; however, we may store more than 16 MB records in a single document using GridFS, which divides huge documents into numerous chunks. If our document is larger than 16 MB, GridFS will store it in two collections: the first will include the chunks, while the second will contain the metadata.
The mongoimport command is used to do the:
Explanation:
MongoDB Import is a command line utility that is used to import data from a TSV, CSV, or JSON file into MongoDB. MongoDB import is part of the MongoDB tool package, which may be downloaded from the official distribution center.
