MongoDB

41.Can you configure the cache size for MMAPv1? How? No. MMAPv1 does not allow configuring the cache size.

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31.What are Primary and Secondary Replica sets? Primary and master nodes are the nodes that can accept writes. MongoDB’s replication is ‘single-master:’ only one node can accept write operations at a time. Secondary and slave nodes are read-only nodes that…

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21.What is a covered query in MongoDB? A covered query is the one in which: fields used in the query are part of an index used in the query, and the fields returned in the results are in the same…

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11.How can you achieve primary key – foreign key relationships in MongoDB? By default MongoDB does not support such primary key – foreign key relationships. However, we can achieve this concept by embedding one document inside another. Foe e.g. an…

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1.What are NoSQL databases? What are the different types of NoSQL databases? A NoSQL database provides a mechanism for storage and retrieval of data that is modeled in means other than the tabular relations used in relational databases (like SQL,…

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