Lesson Learned #343: How to Optimize Your Database Performance with DISABLE_VERSIONING and ALLOW_SNAPSHOT_ISOLATION

Lesson Learned #343: DISABLE_VERSIONING Wait Type and ALLOW_SNAPSHOT_ISOLATION
Introduction
As a Cloud Architect, it is important to understand the core principles and the best practices of database management. As the cloud technology continues to evolve, so too does the need for more efficient and reliable database management. A common issue when working with SQL Server databases is the impact of the DISABLE_VERSIONING wait type and ALLOW_SNAPSHOT_ISOLATION. In this blog post, we will explore the issues associated with this wait type and isolation setting, and provide some strategies for mitigating the associated risks.

Understanding the Problem
The DISABLE_VERSIONING wait type and ALLOW_SNAPSHOT_ISOLATION setting can have a significant impact on SQL Server performance and reliability. When this wait type is enabled, SQL Server is not able to detect deadlocks in the database and can cause the database to become unresponsive. Furthermore, when this wait type is enabled, the ALLOW_SNAPSHOT_ISOLATION setting can also cause poor database performance and reliability. In some cases, this wait type has been known to cause database corruption.

Mitigating the Risk
The best way to mitigate the risks associated with the DISABLE_VERSIONING wait type and ALLOW_SNAPSHOT_ISOLATION setting is to disable both of these settings in the database. This can be done by using the ALTER DATABASE command in SQL Server. This command will disable both the DISABLE_VERSIONING wait type and the ALLOW_SNAPSHOT_ISOLATION setting. Additionally, it is important to ensure that the database is regularly monitored for any potential issues with these settings.

Conclusion
The DISABLE_VERSIONING wait type and ALLOW_SNAPSHOT_ISOLATION setting can have a significant impact on the performance and reliability of a SQL Server database. It is important to understand the risks associated with these settings, and to take steps to mitigate those risks. By disabling both the DISABLE_VERSIONING wait type and the ALLOW_SNAPSHOT_ISOLATION setting in the database, and regularly monitoring the database for any issues related to these settings, Cloud Architects can ensure that their databases remain reliable and performant.
References:
Lesson Learned #343:DISABLE_VERSIONING wait type and ALLOW_SNAPSHOT_ISOLATION
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1. “Lesson Learned #343”
2. “Wait Type DISABLE