Gain insights into DynamoDB, from table creation to security and monitoring. Delve into access control and avoid common mistakes to confidently use this AWS technology.

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DynamoDB is a beautiful piece of technology. This course covers it in depth. You will learn what DynamoDB is, what it can do, and how to use it. You will learn about table creation and go into the details of security and monitoring. Additionally, you will learn how to manage access control in DynamoDB and how to monitor the usage. 

After taking this course you will become confident in using DynamoDB and will have the know-how to avoid those rookie mistakes that people make while using this technology. No matter how familiar you are with AWS technologies, this course has something for you. For the beginner, this course gives a nice flavor of AWS technologies. And for advanced practitioners, this course provides a definitive guide to DynamoDB and related technologies.

DynamoDB Deep Dive: NoSQL for Software Engineers

# Utility of secondary indexes
We have seen how we can query on primary keys or scan the table. Both the options for reading data have their respective trade-offs. Querying on the primary key is fast, but it can only give us a limited set of access patterns. The scan can give us any access pattern, but it is slow and costly. There is a third way, using a secondary index, which is relatively cheap and provides us with more access patterns.

Reading option | Access patterns | Cost | Speed |
--- | --- | --- |---|
Query on primary key|Limited|Low|High
Scan on table|Many (virtually all)|Very high|Slow
Query on secondary indexes|Moderate| Moderate| High

# Types of secondary indexes
There are two types of secondary indexes:

1. **Global Secondary Index(GSI):**
This index allows us to define an alternate partition key and an optional sort key. This function is similar to that of creating a copy of the table with a new primary key.

2. **Local Secondary Index(LSI):**
This index allows us to define a new sort key with the same partition key. This function is similar to that of keeping a new copy of each partition of our table.

||Alternate partition key| Alternate sort key
--|--|--|
Global secondary index|Yes|Optionally
Local secondary index|No|Yes

# Considerations while choosing secondary indexes
Secondary indexes are powerful but they come with their own set of responsibilities.

- Secondary indexes increase your read and write costs. 
- We can only create local secondary indexes at the time of creating the tables. 
- LSIs use the same partition key as the table and consume read and write capacity units from the table's provisioned units. 
- GSIs can have their own separate partition keys. We also need to provision throughput units for GSI separately. We can create or delete GSI for an existing table.



Understand the basics of the local secondary indexes and global secondary indexes.

Welcome!

What is DynamoDB?

Creating Tables

Create a Table in DynamoDB

Creating Items

Create Items in a DynamoDB Table

Reading Data

Read Data in a DynamoDB Table

Secondary Index

Secondary Index in a DynamoDB Table

Monitoring

CloudWatch Monitoring for DynamoDB

Access Management

DynamoDB Best Practices

Conclusion

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Introduction to Secondary Indexes In DynamoDB

Utility of secondary indexes