TK_MHH_MONGODB_2

Indexes can be created to improve the performance of searches within
.
a. MongoDB
b. None of the mentioned above
c. NoSQL
d. Both All

• A

• B

• C

• D

Which of the following queries can use an index on the zip field?
.
a. db.addresses.find({city: "Newark", state: "NJ"}) x
b. db.addresses.find()
O c. db.addresses.find({zip: 55555})

• A

• B

• C

MongoDB uses ___ indexes to index the content stored in arrays.
.
a. multikey
b. none of the mentioned
c. singlekey
d. compkey

• A

• B

• C

• D

Point out the wrong statement.
.
a. Replication allows you to recover from hardware failure and service interruptions
b. Replication provides redundancy and increases data availability
c. None of the mentioned
d. With multiple copies of data on different database servers, replication protects a database from the loss of a single server

• A

• B

• C

• D

The ____ Links pattern provides a simple solution to tree storage but requires multiple queries to retrieve subtrees.
.
a. Child
b. Parent
c. All of the mentioned
d. Root

• A

• B

• C

• D

A ___ set is a group of mongod instances that host the same data set.

.

a. copy
b. replica
c. sorted
d. radii

• A

• B

• C

• D

Point out the correct statement.
.
a. All of the mentioned
b. The query to retrieve the parent of a node is slow and straightforward
c. The query to retrieve the parent of a node is slow and complex
d. The query to retrieve the parent of a node is fast and straightforward

• A

• B

• C

• D

____ operations that use an index often have better performance than those that do not use an index.

.
a. Sort
b. Update
c. Select
d. Delete

• A

• B

• C

• D

Which other type of index is mostly closely related to text indexes?
.
a. Multi-key indexes
b. Single-key indexes

c. Partial indexes
d. Compound indexes

• A

• B

• C

• D

Which one of the following scenarios is the best candidate to use the Extended Reference Pattern to avoid doing additional reads through joins/lookups?
.
a. An app needs to retrieve a product and information about its supplier.
b. An app needs to retrieve a product and its ten most recent reviews.
c. A product model needs to store a counter representing the number of times it was purchased.
d. An order model needs to store the product ID, the price sold, and the quantity ordered for each product in an order.
e. A product model needs to store references to images of the product that are kept in an external location outside the database.

• A

• B

• C

• D

• E