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AWS Certified Data Engineer > Migration and Transfer > Flashcards

Migration and Transfer Flashcards

1
Q

What is the purpose of AWS Application Discovery Service?

A

To help plan data center migrations by identifying on-premises servers and applications, their dependencies, and performance characteristics.

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2
Q

What are the two ways Application Discovery Service gathers data?

A

Agentless and Agent-based Discovery

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3
Q

Which service is the successor to CloudEndure Migration and simplifies migrating applications to AWS using a lift-and-shift approach?

A

Agentless discovery (for basic server info) and Agent-based discovery (for deeper system and network details).

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4
Q

What is AWS Application Migration Service (MGN) primarily used for?

A

“Lift-and-shift” migrations, quickly rehosting applications in AWS with minimal changes and downtime.

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5
Q

What makes AWS Database Migration Service (DMS) different from MGN?

A

DMS focuses specifically on migrating databases to AWS, supporting both homogenous and heterogenous migrations.

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6
Q

Can you use DMS to migrate a database from your data center to Azure?

A

No, DMS is for migrating databases into AWS. The source can be on-premises or in another cloud, but the target must be an AWS service.

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7
Q

What is the role of AWS Schema Conversion Tool (SCT)?

A

To convert the schema of a database to a format compatible with a different database engine.

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8
Q

When would you choose to use AWS Snowball for data migration?

A

When you have a large amount of data that would take a long time (over a week) to transfer over the network.

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9
Q

What is the difference between Snowball and Snowball Edge?

A

Snowball is for data transport only. Snowball Edge can also perform edge computing tasks.

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10
Q

What are some examples of edge computing use cases with Snowball Edge?

A

Preprocessing data, machine learning, media transcoding in locations with limited internet connectivity.

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11
Q

What is AWS DataSync used for?

A

To move large amounts of data between on-premises storage, other cloud providers, and AWS storage services.

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12
Q

Does DataSync require an agent?

A

Yes, for transfers to/from outside of AWS. No agent is needed for transfers between AWS services.

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13
Q

What is the main purpose of AWS Transfer Family?

A

To provide a fully managed, secure file transfer service into and out of Amazon S3 and EFS.

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14
Q

What protocols does Transfer Family support?

A

FTP, FTPS, and SFTP.

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15
Q

How does Transfer Family integrate with existing authentication systems?

A

It can connect with Active Directory, LDAP, Okta, Amazon Cognito, and custom solutions.

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16
Q

What are the benefits of deploying AWS DMS in a Multi-AZ configuration?

A

Increased data redundancy, elimination of I/O freezes, and minimized latency spikes.

17
Q

What is continuous data replication (CDC) with AWS DMS?

A

A feature that allows for near real-time replication of changes from a source database to a target database.

18
Q

What is the difference between homogenous and heterogenous migrations with DMS?

A

Homogenous migrations involve the same database engine (e.g., Oracle to Oracle). Heterogenous migrations involve different database engines (e.g., SQL Server to Aurora).

19
Q

What are some examples of valid source and target locations for AWS DMS?

A

Sources can include on-premises databases, Amazon RDS, and Amazon S3. Targets can include Amazon RDS, Amazon Redshift, and Amazon S3.

20
Q

What are some key considerations when using AWS Schema Conversion Tool (SCT)?

A

SCT is used for converting database schemas between different engines, and compute-intensive instances are recommended for optimal performance.

21
Q

How does AWS Migration Hub help with migration projects?

A

It provides a central location to track and monitor the progress of migrations across multiple AWS services.

22
Q

What is the purpose of the AWS Application Discovery Agent?

A

To gather detailed information about system configuration, performance, running processes, and network connections on your on-premises servers.

23
Q

What is the role of AWS Migration Hub in a migration project?

A

It provides a central dashboard to track the progress of your migrations across different AWS services and tools.

24
Q

Can you use AWS DataSync to transfer data between different storage classes within Amazon S3?

A

Yes, DataSync can move data between any S3 storage classes, including Glacier.

25
Q

What file systems are supported by AWS DataSync for transferring data to AWS?

A

NFS, SMB, HDFS, and those compatible with the S3 API.

26
Q

How frequently can you schedule replication tasks with AWS DataSync?

A

Hourly, daily, or weekly.

27
Q

What are the available options for AWS Snowball Edge devices?

A

Compute Optimized (for running EC2 instances and Lambda functions) and Storage Optimized (for large-scale data transfers).

28
Q

What is the AWS OpsHub used for?

A

It’s a client application that simplifies the process of configuring and managing AWS Snow Family devices.

29
Q

What happens to the data on a Snowball device after it is shipped back to AWS?

A

The data is securely transferred to your designated S3 bucket, and then the device is completely wiped clean.

30
Q

Why might you choose AWS Transfer Family over other file transfer methods?

A

It offers a fully managed service, integrates with existing authentication systems, and supports common file transfer protocols like FTP, FTPS, and SFTP.

31
Q

What are some typical use cases for AWS Transfer Family?

A

Sharing files with partners, distributing public datasets, and integrating with CRM or ERP systems.

32
Q

What are some of the database engines supported by AWS DMS as a source or target?

A

Oracle, Microsoft SQL Server, MySQL, MariaDB, PostgreSQL, MongoDB, SAP, and DB2.

33
Q

Can AWS DMS migrate data to Amazon DynamoDB?

A

Yes, DynamoDB is a valid target for AWS DMS.

34
Q

What is the advantage of using DMS for database migrations?

A

DMS minimizes downtime during migrations, as the source database remains available throughout the process.

AWS Certified Data Engineer (14 decks)

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