Why secondary indexes enable flexible queries in DynamoDB - Quick Recap

Recall & Review

beginner

What is a secondary index in DynamoDB?

A secondary index is a data structure that lets you query the table using an alternate key, different from the primary key.

beginner

How do secondary indexes enable flexible queries?

They allow you to search data using different attributes without scanning the whole table, making queries faster and more efficient.

intermediate

What are the two types of secondary indexes in DynamoDB?

Global Secondary Index (GSI) and Local Secondary Index (LSI). GSIs can have different partition and sort keys, LSIs share the partition key but have a different sort key.

beginner

Why is using a secondary index better than scanning the whole table?

Because it lets you directly access the data you want using an alternate key, avoiding slow and costly full table scans.

intermediate

Can secondary indexes be updated independently from the main table in DynamoDB?

No, secondary indexes are automatically updated by DynamoDB when the main table data changes, keeping them in sync.

What does a secondary index in DynamoDB allow you to do?

A Delete data faster

B Backup data to another region

C Encrypt data automatically

D Query data using an alternate key

Secondary indexes let you query data using keys other than the primary key.

Which type of secondary index can have a different partition key than the main table?

A Local Secondary Index (LSI)

B Primary Index

C Global Secondary Index (GSI)

D Composite Index

Global Secondary Indexes can have different partition and sort keys from the main table.

Why are secondary indexes useful for flexible queries?

A They reduce the need for full table scans

B They increase storage space

C They speed up data insertion

D They encrypt data

Secondary indexes let you query efficiently without scanning the entire table.

What happens to secondary indexes when you update the main table?

A They must be updated manually

B They update automatically

C They become invalid

D They are deleted

DynamoDB automatically updates secondary indexes to keep them in sync with the main table.

Which secondary index shares the same partition key as the main table?

A Local Secondary Index (LSI)

B Foreign Index

C Primary Index

D Global Secondary Index (GSI)

Local Secondary Indexes share the partition key but have a different sort key.

Explain how secondary indexes improve query flexibility in DynamoDB.

Think about how you can search data differently without slowing down.

Describe the difference between Global Secondary Index and Local Secondary Index.

Focus on keys and how they affect querying.