Wisdom jobs Dynamodb Interview Questions and answers have been framed specially to get you prepared for the most frequently asked questions in many job interviews. Here we have provided Tips and Tricks for cracking Dynamodb interview Questions. These Dynamodb Interview questions and answers are useful for Beginner, Advanced Experienced programmers and job seekers of different experience levels. It's a good idea to go through Dynamodb Interview Questions. All the best in your job search.
Question 1. Explain What Is Dynamodb?
Answer :
Question 2. List Some Benefits Of Using Amazon Dynamodb?
Answer :
Here is the list of some of the benefits of using Amazon DynamoDB:
Question 3. What Are The Non-relational Databases?
Answer :
The Non-Relational databases are NoSQL databases.
These databases are categorized into four groups.
They are:
Question 4. Is Dynamodb Free For Use?
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Question 5. Explain What Is Dynamodb Mapper Class?
Answer :
It is the entry point to DynamoDB.The DynamoDB Mapper class provides access to a DynamoDB endpoint and enables the user to access to their data in various tables, execute queries and scan against tables, and perform CRUD operations on items.
Question 6. List The Data Types Supported By Dynamodb?
Answer :
DynamoDB supports four scalar data types, and they are:
DynamoDB supports collection data types such as:
DynamoDB also supports Null values.
Question 7. Does Dynamodb Support In-place Atomic Updates?
Answer :
Amazon DynamoDB supports quick in-place atomic updates, were the numeric attributes increment and decrement can be done in arrow using just one API call or similarly, you can add or remove sets, lists, or maps.
Question 8. What Kind Of Query Functionality Does Dynamodb Support?
Answer :
Question 9. Does Amazon Dynamodb Support Conditional Operations?
Answer :
For an operation to be completed on an item, you have to specify a condition.You can define a ConditionExpression that can be constructed from the following:
Boolean functions:
ATTRIBUTE_EXIST, CONTAINS, and BEGINS_WITH
Comparison operators:
=, <>, <, >, <=, >=, BETWEEN, and IN
Logical operators:
NOT, AND, and OR.
You can also construct a free-form conditional expression that combines multiple conditional clauses which also includes nested clauses.
Question 10. List Some Difference Between Amazon Dynamodb And Amazon Simpledb?
Answer :
Amazon DynamoDB :
It is a fast and scalable NoSQL Database Service that is designed for internet scale applications, to maintain predictably high performance and to be highly cost-effective for workloads of any scale, on the top of all it is highly recommended.
Amazon SimpleDB :
It has scaling limitations and is a good fit for smaller workloads that requires query flexibility.It automatically indexes all item attributes and supports query flexibility at the cost of performance and scale.
Question 11. List The Apis Provided By Amazon Dynamodb?
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Question 12. What Amazon Dynamodb Batchwriteitem Api Does?
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Question 13. Explain Key-value Store?
Answer :
It is a database service that provides and supports storing, updating and querying the objects that are identified using key and values that constitutes the actual content that is being stored.
Question 14. What Is Dynamodb Auto Scaling?
Answer :
DynamoDB is a superintendent feature that scales up and down the read and write capacity of a DynamoDB or a global secondary index automatically.
Question 15. What Are Global Secondary Indexes?
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Question 16. List Types Of Secondary Indexes Supported By Amazons Dynamodb?
Answer :
Two types of indexes are supported by Amazon DynamoDB.
They are:
Global Secondary index :
It is an index with a partition or a partition sort key that is different from those on the table. The global secondary index is considered to be global because queries on the index can span all the items in a table, across all the partitions.
Local secondary index :
An index that has the same partition key as that of the table but different sort key. It is considered to be “local” because every partition of the index is scoped to a table partition that has the same partition key.
Question 17. How Many Numbers Of Global Secondary Indexes Do You Create Per Table?
Answer :
You are allowed to create a maximum of 5 global secondary indexes per table.
Question 18. What Are Api Calls Supported By A Global Secondary Index?
Answer :
“Query” and “Scan” are the API calls that are supported by Global Secondary Index.
Question 19. How To Delete A Global Secondary Index In Amazon Dynamodb?
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Question 20. What Are Local Secondary Indexes?
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Question 21. What Are Projections?
Answer :
Each index consists of a minimum of 3 attributes.
They are:
Question 22. How To Create Local Secondary Indexes?
Answer :
A Local secondary index needs to be created at the time of creating a table that can’t be added currently.
So, later when you create a local secondary index, try specifying the following two parameters.
Indexed Sort Key :
The attribute on which indexing and querying are performed.
Projected Attributes :
It is the list of attributes from the table that can directly be copied into the local secondary index. Without projected attributes, the local secondary index contains only primary keys and secondary keys.
Question 23. Can I Add Local Secondary Indexes To An Existing Table?
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Question 24. How Many Local Secondary Indexes Can Be Created On One Table?
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Each table can constitute up to five local secondary indexes.
Question 25. Can I Delete Local Secondary Indexes?
Answer :
Currently, the Amazon DynamoDB is incapable of removing the local secondary indexes from the table once they are created, but it is possible to delete the entire table.
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