What is MongoDB Data Modeling?

Unlike the structured database, where we need to determine table’s schema in advance, MongoDB is very flexible in this area.

Also, common fields in a collection can contain different types of data. This helps in easy mapping.

We know that MongoDB is a document-oriented database or NoSQL database.

MongoDB deals in collections, documents, and fields.

It is a schema-less database or we can say, it has a flexible schema / We can have documents containing different sets of fields or structures in the same collection.

Point out the wrong statement.

Collections do enforce document structure

Decisions that affect how you model data can affect application performance and database capacity

Data in MongoDB has a flexible schema

Which of the following is true regarding partial indexes?

Partial indexes support compound indexes.

Partial indexes can be used to reduce the number of keys in an index.

Partial indexes represent a superset of the functionality of sparse indexes.

Partial indexes don't support a uniqueness constraint.

Which of the following queries can use an index on the zip field?

db.addresses.find( { zip : 55555 } )

db.addresses.find( { city : "Newark", state : "NJ" } )

Which of the following statements are true about MongoDB documents?

MongoDB documents have a flexible schema

MongoDB documents are stored as BSON documents

MongoDB documents within a collection must have the same fields.

Point out the correct statement.

Data in MongoDB has a flexible schema

In practice, the documents in a collection share a different structure

The key challenge in data modeling is balancing the needs of the application, the performance characteristics of the database engine, and the data retrieval patterns

Which one of the following scenarios is the best candidate for use of the Subset Pattern?

The working set does not fit in memory and it is difficult to scale the hardware.

The developers of the system have left and no one understands the application.

The system is running out of RAM.

The system is accessing the disk too frequently

The data model available within MongoDB allows us to represent ___.

Able to handle complex structures

Point out the correct statement.

One-to-One Relationships with embedded documents presents a data model that uses embedded documents to describe one-to-one relationships between connected data

One-to-Many Relationships with embedded documents presents a data model that uses embedded documents to describe one-to-one relationships between connected data

One-to-One Relationships with document references presents a data model that uses embedded documents to describe one-to-one relationships between connected data

Which of the following statements regarding indexes are true?

The _id field is automatically indexed on all collections

Indexes reduce the number of documents MongoDB needs to examine to satisfy a query.

Indexes are used to increase the speed of our queries.

Indexes can decrease write, update, and delete performance.

Which of the following relationship uses references to describe documents between connected data?

One-to-Many Relationships with Embedded Documents

One-to-Many Relationships with Document References

One-to-One Relationships with Embedded Documents

Which one of the following scenarios is best suited for the application of the Attribute Pattern?

Some fields share a number of characteristics, and we want to search across those fields.

The system is accessing the disk too frequently.

The documents need strict validation.

The working set does not fit in memory.

When should you ever read from secondaries?

To increase performance in a write-heavy system.

When doing ad-hoc queries and analytic jobs.

To provide reads with lower latency.

Which of the following phases are included in our data modeling methodology for MongoDB?

Identify the relationships between models.

Identifying the workload of the system.

Applying schema design patterns.

The create operations in database:

is an operation which involve writing data to the database

is an operation which change data that already exists in a database

Point out the correct statement.

The query to retrieve the parent of a node is fast and straightforward

The query to retrieve the parent of a node is slow and complex

The query to retrieve the parent of a node is slow and straightforward

Which of the following statements are true about one-to-zillions relationships?

We must take extra care when writing queries that retrieve data on the zillions side.

The relationship representations that embed documents are not recommended.

It is a special case of the one-to-many relationship.

Which of the following are valid ways to represent a one-to-one relationship with the document model in MongoDB?

Link to a single document in another collection.

Embed the fields in the document.

Embed the fields as a sub-document in the document.

Point out the wrong statement.

The query scans the index and the collection

Creating indexes that support queries results in greatly increased query performance

An index supports a query when the index contains all the fields scanned by the query

Which of the following statements are true about data modeling using MongoDB?

MongoDB will help you iterate on the schema designs of your models throughout your application's lifecycle

MongoDB is schema-less so you should not worry about designing a schema for your models.

MongoDB should only be used for unstructured datasets.

Which of the following is/are true?

Picking a good shard key is one of the most important parts of sharding.

Vertical scaling is generally cheaper than horizontal scaling.

Ordered bulk operations are faster than unordered.

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

MongoDB is one of the leading NoSQL databases?

False

True

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

MongoDB indexes use a _______ data structure.

B-tree

All of the mentioned

Hash

Map

MULTIPLE SELECT QUESTION

45 sec • 1 pt

Consider a one-to-many relationship observed between a county and the cities in that county. Which of the following are valid ways to represent this one-to-many relationship with the document model in MongoDB?

document having a field to reference the document of its county.

Embed the entities for the cities as an array of sub-documents in the corresponding county document.

Embed all the fields for a city as a subdocument in the corresponding county document.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is not part of the first phase of the data modeling methodology?

Identifying the durability of each write operation.

Listing the write operations.

Listing the read operations.

Quantifying each of the operations in terms of latency and frequency

Identifying the relationships between the units of data.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

_______ scaling adds more CPU and storage resources to increase capacity.

All of the mentioned

Horizontal

Vertical

Partition

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following pattern is best for static trees that do not change?

Root

Parent

Child

None of the mentioned

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The ________ References pattern stores each tree node in a document; in addition to the tree node, the document stores the id of the node’s parent.

Root

Child

None of the mentioned

Parent

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Mongodb

MongoDB is one of the leading NoSQL databases?

MongoDB indexes use a _______ data structure.

Consider a one-to-many relationship observed between a county and the cities in that county. Which of the following are valid ways to represent this one-to-many relationship with the document model in MongoDB?

Which of the following is not part of the first phase of the data modeling methodology?

_______ scaling adds more CPU and storage resources to increase capacity.

Which of the following pattern is best for static trees that do not change?

The ________ References pattern stores each tree node in a document; in addition to the tree node, the document stores the id of the node’s parent.

What is MongoDB Data Modeling?

The most frequent operations in a given application are

Which of the following pattern is more straightforward to use?

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