Recurring High PREEMPTIVE_OS_QUERYREGISTRY On Sql Serever 2022

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Introduction

Microsoft SQL Server 2022 is a powerful database management system that offers numerous features and improvements over its predecessors. However, like any other complex system, it can be prone to various issues and performance problems. One such issue that has been reported by several users is the recurring high PREEMPTIVE_OS_QUERYREGISTRY wait type. In this article, we will delve into the causes, symptoms, and solutions for this issue, providing a comprehensive analysis to help you troubleshoot and resolve the problem.

Understanding PREEMPTIVE_OS_QUERYREGISTRY

Before we dive into the analysis, it's essential to understand what PREEMPTIVE_OS_QUERYREGISTRY is. This wait type is related to the registry query operation, which is a system call that retrieves information from the Windows registry. The registry is a database that stores settings and options for the operating system and applications. When a SQL Server process needs to access the registry, it will issue a system call to the operating system, which will then query the registry and return the requested information.

Causes of High PREEMPTIVE_OS_QUERYREGISTRY

There are several reasons why you may experience high PREEMPTIVE_OS_QUERYREGISTRY wait times on your SQL Server 2022 instance. Some of the most common causes include:

1. Registry Hives Corruption

Corruption in the registry hives can cause SQL Server to experience high wait times when querying the registry. Registry hives are the top-level keys in the Windows registry that contain subkeys and values. Corruption in these hives can lead to incorrect or incomplete data being returned, causing SQL Server to wait for the operation to complete.

2. Registry Permissions Issues

Incorrect or missing registry permissions can also cause high PREEMPTIVE_OS_QUERYREGISTRY wait times. When SQL Server tries to access the registry, it may not have the necessary permissions to read or write to the registry keys, leading to wait times.

3. Registry Key Overload

If there are too many registry keys or values, it can cause SQL Server to experience high wait times when querying the registry. This is because the registry is a database, and like any database, it can become slow and inefficient if it contains too much data.

4. SQL Server Configuration Issues

Incorrect or missing SQL Server configuration settings can also cause high PREEMPTIVE_OS_QUERYREGISTRY wait times. For example, if the SQL Server service account does not have the necessary permissions to access the registry, it can lead to wait times.

5. Windows Server Configuration Issues

Windows Server configuration issues can also cause high PREEMPTIVE_OS_QUERYREGISTRY wait times. For example, if the Windows Server service account does not have the necessary permissions to access the registry, it can lead to wait times.

Symptoms of High PREEMPTIVE_OS_QUERYREGISTRY

The symptoms of high PREEMPTIVE_OS_QUERYREGISTRY wait times can vary depending on the cause of the issue. However, some common symptoms include:

  • High CPU usage on the SQL Server instance
  • High memory usage on the SQL Server instance
  • Slow query performance *locks or blocking issues
  • Error messages related to registry access or permissions

Troubleshooting High PREEMPTIVE_OS_QUERYREGISTRY

To troubleshoot high PREEMPTIVE_OS_QUERYREGISTRY wait times, you can follow these steps:

1. Check Registry Hives Corruption

Use the Windows built-in tool, chkdsk, to check for corruption in the registry hives. You can also use third-party tools, such as RegEdit, to manually check for corruption.

2. Check Registry Permissions

Use the Windows built-in tool, icacls, to check the permissions on the registry keys. You can also use third-party tools, such as RegEdit, to manually check the permissions.

3. Check Registry Key Overload

Use the Windows built-in tool, regedit, to check the number of registry keys and values. You can also use third-party tools, such as RegEdit, to manually check the registry.

4. Check SQL Server Configuration

Use the SQL Server Management Studio (SSMS) to check the SQL Server configuration settings. You can also use the sp_configure system stored procedure to check the configuration settings.

5. Check Windows Server Configuration

Use the Windows built-in tool, icacls, to check the permissions on the registry keys. You can also use third-party tools, such as RegEdit, to manually check the permissions.

Solutions for High PREEMPTIVE_OS_QUERYREGISTRY

Once you have identified the cause of the high PREEMPTIVE_OS_QUERYREGISTRY wait times, you can implement the following solutions:

1. Fix Registry Hives Corruption

Use the Windows built-in tool, chkdsk, to fix corruption in the registry hives. You can also use third-party tools, such as RegEdit, to manually fix the corruption.

2. Fix Registry Permissions Issues

Use the Windows built-in tool, icacls, to fix the permissions on the registry keys. You can also use third-party tools, such as RegEdit, to manually fix the permissions.

3. Optimize Registry Key Overload

Use the Windows built-in tool, regedit, to optimize the registry keys and values. You can also use third-party tools, such as RegEdit, to manually optimize the registry.

4. Fix SQL Server Configuration Issues

Use the SQL Server Management Studio (SSMS) to fix the SQL Server configuration settings. You can also use the sp_configure system stored procedure to fix the configuration settings.

5. Fix Windows Server Configuration Issues

Use the Windows built-in tool, icacls, to fix the permissions on the registry keys. You can also use third-party tools, such as RegEdit, to manually fix the permissions.

Conclusion

Q: What is PREEMPTIVE_OS_QUERYREGISTRY and why is it causing high wait times?

A: PREEMPTIVE_OS_QUERYREGISTRY is a wait type that occurs when SQL Server is waiting for the operating system to complete a registry query operation. This can cause high wait times if the registry is corrupted, permissions are incorrect, or the registry is overloaded.

Q: How do I identify the cause of high PREEMPTIVE_OS_QUERYREGISTRY wait times?

A: To identify the cause of high PREEMPTIVE_OS_QUERYREGISTRY wait times, you can use the following methods:

  • Check for registry hives corruption using the Windows built-in tool, chkdsk.
  • Check registry permissions using the Windows built-in tool, icacls.
  • Check the number of registry keys and values using the Windows built-in tool, regedit.
  • Check SQL Server configuration settings using the SQL Server Management Studio (SSMS).
  • Check Windows Server configuration settings using the Windows built-in tool, icacls.

Q: What are some common symptoms of high PREEMPTIVE_OS_QUERYREGISTRY wait times?

A: Some common symptoms of high PREEMPTIVE_OS_QUERYREGISTRY wait times include:

  • High CPU usage on the SQL Server instance
  • High memory usage on the SQL Server instance
  • Slow query performance
  • Locks or blocking issues
  • Error messages related to registry access or permissions

Q: How do I troubleshoot high PREEMPTIVE_OS_QUERYREGISTRY wait times?

A: To troubleshoot high PREEMPTIVE_OS_QUERYREGISTRY wait times, you can follow these steps:

  • Check for registry hives corruption using the Windows built-in tool, chkdsk.
  • Check registry permissions using the Windows built-in tool, icacls.
  • Check the number of registry keys and values using the Windows built-in tool, regedit.
  • Check SQL Server configuration settings using the SQL Server Management Studio (SSMS).
  • Check Windows Server configuration settings using the Windows built-in tool, icacls.

Q: What are some common solutions for high PREEMPTIVE_OS_QUERYREGISTRY wait times?

A: Some common solutions for high PREEMPTIVE_OS_QUERYREGISTRY wait times include:

  • Fixing registry hives corruption using the Windows built-in tool, chkdsk.
  • Fixing registry permissions using the Windows built-in tool, icacls.
  • Optimizing the registry keys and values using the Windows built-in tool, regedit.
  • Fixing SQL Server configuration settings using the SQL Server Management Studio (SSMS).
  • Fixing Windows Server configuration settings using the Windows built-in tool, icacls.

Q: Can high PREEMPTIVE_OS_QUERYREGISTRY wait times cause data loss or corruption?

A: Yes, high PREEMPTIVE_OS_QUERYREGISTRY wait times can cause data loss or corruption if the registry is corrupted or permissions are incorrect. It is essential to troubleshoot and resolve the issue as soon as possible to prevent data loss or corruption.

: How can I prevent high PREEMPTIVE_OS_QUERYREGISTRY wait times in the future?

A: To prevent high PREEMPTIVE_OS_QUERYREGISTRY wait times in the future, you can follow these best practices:

  • Regularly back up the registry to prevent corruption.
  • Monitor registry permissions and ensure they are correct.
  • Optimize the registry keys and values to prevent overload.
  • Regularly check SQL Server configuration settings to ensure they are correct.
  • Regularly check Windows Server configuration settings to ensure they are correct.

Q: Can I use third-party tools to troubleshoot and resolve high PREEMPTIVE_OS_QUERYREGISTRY wait times?

A: Yes, you can use third-party tools to troubleshoot and resolve high PREEMPTIVE_OS_QUERYREGISTRY wait times. Some popular third-party tools include:

  • RegEdit: A registry editor that allows you to manually check and fix registry corruption.
  • Icacls: A tool that allows you to check and fix registry permissions.
  • Chkdsk: A tool that allows you to check and fix registry hives corruption.
  • SQL Server Management Studio (SSMS): A tool that allows you to check and fix SQL Server configuration settings.

Q: Can I contact Microsoft support for help with high PREEMPTIVE_OS_QUERYREGISTRY wait times?

A: Yes, you can contact Microsoft support for help with high PREEMPTIVE_OS_QUERYREGISTRY wait times. Microsoft support can provide you with additional guidance and assistance to troubleshoot and resolve the issue.