Which of the following is/are correct about indexes in NoSQL databases?Question 10Select one or more:Select one or more:a.Indexes are abandoned in NoSQL databases.b.MongoDB can support indexes on any attribute of documents in a collection.c.MongoDB can only support indexes on the top-level attributes of documents in a collection.d.Google's Bigtable does not support the building of any index on a (big)table.
Question
Which of the following is/are correct about indexes in NoSQL databases?Question 10Select one or more:Select one or more:a.Indexes are abandoned in NoSQL databases.b.MongoDB can support indexes on any attribute of documents in a collection.c.MongoDB can only support indexes on the top-level attributes of documents in a collection.d.Google's Bigtable does not support the building of any index on a (big)table.
Solution
The correct answers are:
b. MongoDB can support indexes on any attribute of documents in a collection.
This is true because MongoDB allows indexing on any field in the document, not just the top-level attributes. This makes it possible to efficiently query documents based on nested fields.
The other options are incorrect:
a. Indexes are not abandoned in NoSQL databases. While NoSQL databases are designed to handle data in a different way than traditional SQL databases, they still use indexes to improve query performance.
c. As mentioned above, MongoDB does not only support indexes on the top-level attributes of documents in a collection. It can index any attribute.
d. Google's Bigtable does support the building of indexes on a table. Bigtable is designed to handle massive amounts of data across thousands of commodity servers, and indexes are a key part of its ability to quickly retrieve data.
Similar Questions
Which of the following is/are correct?Question 4Select one or more:Select one or more:a.Some NoSQL databases let the programmer decide the trade-off between scalability and consistency.b.Different NoSQL databases may offer different levels of transaction supports.c.There are no transactions in any NoSQL databases.d.NoSQL databases define isolation levels under the BASE model .
True or False: NoSQL databases provide greater performance at the expense of availability.Question 4Select one:TrueFalse
Which of the following are characteristics of NoSQL databases? Select all that apply. 1 mark is deducted for each incorrect choice.Question 2Select one or more:A.Complex query supportB.Eventual consistencyC.ACID transactionsD.Strong consistencyE.Limited horizontal scalabilityF.Horizontal scalingG.Distributed computingH.High availabilityI.Schema-free designJ.Complex joins
When do we choose a NoSQL database
3. How do you create an index on a table in a relational database, and what is the significance of indexing in terms of query performance?
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