NewComb uniqueness violation

Question

User-150770710 posted

Hi

I am using NewComb to generate GUID in my web application. The key is used for activity log, which any action taken by user would be recorded.

I just hit error of uniqueness violation when deploy to customer. The # of access is high but should be extremely high. Any ideas how could it happen? 

Thank you

Answer 1

User-2131369213 posted

 

The odds for that are astronomical. Either there is a bug or you just won the jackpot of the galaxy. :-)

 

just use    Guid test = Guid.NewGuid();

 

Answer 2

User-150770710 posted

Hi

I use NewComb is to have sequential GUID.

I don't think I won jackpot, because it hit so frequent especially in peak hours.

Answer 3

User-578657687 posted

Hi,

To reproduce this issue is difficult, I suggest you to use “GUID.NewGuid”, like the code snippet below:

// This code example demonstrates the Guid.NewGuid() method.

using System;

class Sample 
{
    public static void Main() 
    {
    Guid g;
// Create and display the value of two GUIDs.
    g = Guid.NewGuid();
    Console.WriteLine(g);
    Console.WriteLine(Guid.NewGuid());
    }
}

/*
This code example produces the following results:

0f8fad5b-d9cb-469f-a165-70867728950e
7c9e6679-7425-40de-944b-e07fc1f90ae7

*/

Also, you can use GUID Generation to create GUID, this tutorial demonstrates how to use it.<o:p></o:p>

<o:p> </o:p>

For more information about GUID Structure please look at the following link:<o:p></o:p>

http://msdn.microsoft.com/en-us/library/cey1zx63(v=VS.80).aspx<o:p></o:p>

http://msdn.microsoft.com/en-US/library/system.guid_members(v=VS.80).aspx <o:p></o:p>