Strange Login and AppDomain xx created

Salam ELIAS 112 Reputation points

On a sql 2k16, when I go through error logs, I find a lot of messages las follows

Server Date Process Count Text
SQL2K12 2021-03-15 13:30:44.640 spid17s 1 AppDomain 39 (MDS.mds_schema_user[runtime].38) unloaded.
SQL2K12 2021-03-15 13:00:15.550 spid62 1 AppDomain 40 (master.sys[runtime].39) created.
SQL2K12 2021-03-15 13:00:15.550 spid62 1 AppDomain 40 (master.sys[runtime].39) created.
SQL2K12 2021-03-15 10:00:43.090 spid45s 1 AppDomain 39 (MDS.mds_schema_user[runtime].38) created.

Not sure what this appDomain creating and unloading?

SQL Server
SQL Server
A family of Microsoft relational database management and analysis systems for e-commerce, line-of-business, and data warehousing solutions.
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  1. Erland Sommarskog 106K Reputation points MVP

    In addition to Tom's post: these AppDomain relates the CLR, running .NET inside SQL Server, which apparently Master Data Services uses.

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  2. CarrinWu-MSFT 6,866 Reputation points

    Hi @Salam Elias ,

    Represents an application domain, which is an isolated environment where applications execute. This class cannot be inherited. Application domains provide a unit of isolation for the common language runtime. They are created and run inside a process. Application domains are usually created by a runtime host, which is an application responsible for loading the runtime into a process and executing user code within an application domain. The runtime host creates a process and a default application domain, and runs managed code inside it. Please refer to AppDomain Class and Using Application Domains to get more information.

    Best regards,

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  3. Salam ELIAS 112 Reputation points

    So many thanks. I would like to accept all your answers but it seems I can't. In this case I will ask the following question and I think is related to this probelm.
    I receive an alert indicating
    SQL2K12 2021-03-16 10:01:12.400 SALAM\SQL2K12$ 1 ::1 Reason: Could not find a login matching the name provided

    I am not aware of any application I have that uses such login in my domain salam. I tried to do a trace on the sql server, entering "winNtLogin = SALAM\SQL2K12$", nothing is logged in the profiler in spite of the fact that I still get the alert every 60 minutes

  4. Salam ELIAS 112 Reputation points

    No, I rerun right now with Audit fail, I thought Audit login in and out will show something, sorry.
    I will let you know, I will wait for my script to run

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