In SQL Server 2022, the Query Store feature includes a new feature called optimized plan forcing, which allows you to force a specific query plan for a given query, even if the Query Optimizer would choose a different plan. This can be useful in cases where you know that a specific query plan performs better than other plans that the Query Optimizer might choose.
To use optimized plan forcing with Query Store, you first need to enable the feature by setting the "QUERY_STORE_OPTIMIZED_PLAN_FORCING" database configuration option to "ON". Once this is done, you can then use the "ALTER DATABASE" command to specify a forced plan for a specific query.
For example, the following command forces a specific plan for a query with the query ID of 1234:
ALTER DATABASE [DatabaseName] SET QUERY_STORE FORCED_PLAN (QUERY_ID = 1234, PLAN_ID = 5678);
This will force the specified plan with ID 5678 to be used for any future executions of the query with ID 1234, even if the Query Optimizer would normally choose a different plan.
You can also use the Query Store reports and views to monitor the use of forced plans and their performance over time. This can help you identify cases where a forced plan is no longer optimal and needs to be updated or removed.
It's important to note that optimized plan forcing should be used with caution and only in cases where you have thoroughly tested the forced plan and confirmed that it consistently performs better than other plans. In some cases, a forced plan may not perform as well as other plans in certain situations, and it can be difficult to identify and correct these issues once the plan is forced.
Overall, optimized plan forcing with Query Store is a powerful feature that can help optimize query performance in SQL Server 2022, but it should be used judiciously and with careful testing and monitoring
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