GUIDs no .NET 9: Novidades que Você Precisa Conhecer | #balta

Summary

In today's video, André Baltieri explores the installation of .NET 9 Preview 7 and delves into the new features of .NET 7, particularly focusing on the GUID (Globally Unique Identifier). He discusses the pros and cons of using GUIDs, such as their unpredictability and the ability to generate them across different platforms. André also highlights the performance considerations when using GUIDs as primary keys in databases compared to integers. A significant update in .NET 9 Preview 7 is the introduction of 'Guid.Create', which allows for the creation of ordered GUIDs, improving their predictability and usefulness in certain scenarios. The video concludes with a call to action for viewers to share their thoughts on the new .NET features and their use of GUIDs in their systems.

Takeaways

• 😀 The video discusses the installation and features of .NET 9 Preview 7.
• 🛠️ The presenter, André Baltieri, demonstrates the installation process of .NET 9 on a Windows machine, simulating a fresh setup.
• 🆕 A new feature in .NET 9 is the introduction of 'Guid', which is explored in the video for its uses and benefits.
• 🔑 Guids are highlighted for their unpredictability, making them suitable for security-sensitive applications where predictability could be a vulnerability.
• 🌐 Cross-platform functionality of Guids is mentioned, noting that they work seamlessly across different platforms like SQL Server and MongoDB.
• 📝 The video explains how to generate a Guid in .NET using 'New Guid' or 'Guid New Guid' syntax and how to format it using 'ToString' method.
• 🔢 A discussion on the performance implications of using Guids versus integers as primary keys in databases is presented, noting that integers are typically faster.
• 📈 The video introduces a new method 'Guid.Create' in .NET 9 that allows for the creation of ordered Guids, which can improve database indexing and search performance.
• 📅 The 'Create' method uses a timestamp-based approach for generating ordered Guids, which can be customized using a 'TimeProvider' for scenarios requiring specific time settings.
• 💬 The presenter encourages viewers to share their thoughts on the new Guid features in .NET 9 and whether they use Guids in their systems, fostering community engagement.

Q & A

What is the main topic of the video?

The video discusses .NET 9 Preview 7, including its installation process and exploring the new features, particularly GUIDs.

How does the speaker suggest installing .NET 9 Preview 7?

The speaker guides viewers through the installation process by visiting dotnet.microsoft.com, selecting the appropriate version for their operating system, and following standard installation steps like 'Next, Next, Finish'.

What is the difference between GUID and INT for IDs in databases?

GUIDs offer unpredictability and are more secure due to their random nature, while INTs are sequential and more performance-efficient for database operations, particularly when used as primary keys.

What is a GUID and how is it typically used?

A GUID (Globally Unique Identifier) is a 128-bit identifier used to ensure unique values in various systems. It is commonly used to create unique keys for users or objects in databases.

What are some advantages of using GUID over INT?

GUIDs provide better security through randomness and are useful when there's a need to avoid predictability, such as in URLs or public-facing identifiers. They also allow for globally unique identification across multiple platforms.

What is one drawback of using GUIDs as primary keys?

GUIDs are larger in size compared to INTs, which can slow down performance, as they require more processing power and storage space in databases.

What is the new feature related to GUIDs in .NET 9 Preview 7?

In .NET 9 Preview 7, a new feature called GUID Version 7 is introduced, which reserves certain bits to generate GUIDs in a sequential manner, improving performance in scenarios where ordered GUIDs are needed.

How does GUID Version 7 improve upon traditional GUID generation?

GUID Version 7 introduces predictability by using a timestamp-based approach, which can improve indexing and retrieval performance when GUIDs are used in databases.

What customization options are available for GUIDs in .NET 9 Preview 7?

Developers can customize GUID generation by specifying their own time provider, such as UTC, to ensure that GUIDs are created based on specific time formats or other parameters.

Why might a developer choose to use GUID for identification but not as a primary key?

A developer might use a GUID for identification due to its global uniqueness but opt not to use it as a primary key because INTs or LONGs offer better performance as primary keys in most databases.

What is the impact of GUID size on database performance?

GUIDs, being 128-bit, require more storage and processing cycles compared to 32-bit or 64-bit INTs, which can slow down queries, indexing, and overall database performance.