Skip to main content

Using GuidCOMB in SQL Server and PostgreSQL

On a project I’m working on, we expect to have a really large amount of data. Therefore we decided to switch our ID strategy from Integers to GUIDs. Problem is that when you start using GUIDs as part of your database index, they become really fragmented resulting in longer write times.

To solve this, you can use the GuidCOMB technique where a part of the GUID is replaced by a sorted date/time value. This guarantees that values will be sequential and avoids index page splits.

NHibernate and Marten supports the GuidCOMB technique out-of-the-box but if you want to use it with other tools you can try RT.Comb,  a small .NET Core library that generated “COMB” GUID values in C#.

Here is a sample how to use it in combination with Entity Framework:

  • Let’s first create an Entity Framework Value Generator that uses the RT.Comb library:
  • To apply this generator when an object is added to a DbContext, you can specify it in the Fluent mapping configuration:
Labels:

Popular posts from this blog

Podman– Command execution failed with exit code 125

After updating WSL on one of the developer machines, Podman failed to work. When we took a look through Podman Desktop, we noticed that Podman had stopped running and returned the following error message: Error: Command execution failed with exit code 125 Here are the steps we tried to fix the issue: We started by running podman info to get some extra details on what could be wrong: >podman info OS: windows/amd64 provider: wsl version: 5.3.1 Cannot connect to Podman. Please verify your connection to the Linux system using `podman system connection list`, or try `podman machine init` and `podman machine start` to manage a new Linux VM Error: unable to connect to Podman socket: failed to connect: dial tcp 127.0.0.1:2655: connectex: No connection could be made because the target machine actively refused it. That makes sense as the podman VM was not running. Let’s check the VM: >podman machine list NAME         ...
Read more

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.
Read more

VS Code Planning mode

After the introduction of Plan mode in Visual Studio , it now also found its way into VS Code. Planning mode, or as I like to call it 'Hannibal mode', extends GitHub Copilot's Agent Mode capabilities to handle larger, multi-step coding tasks with a structured approach. Instead of jumping straight into code generation, Planning mode creates a detailed execution plan. If you want more details, have a look at my previous post . Putting plan mode into action VS Code takes a different approach compared to Visual Studio when using plan mode. Instead of a configuration setting that you can activate but have limited control over, planning is available as a separate chat mode/agent: I like this approach better than how Visual Studio does it as you have explicit control when plan mode is activated. Instead of immediately diving into execution, the plan agent creates a plan and asks some follow up questions: You can further edit the plan by clicking on ‘Open in Editor’: ...
Read more