| Memory grant feedback | Memory grant feedback adjusts the size of the memory allocated for a query based on past performance. SQL Server 2022 preview introduces [Percentile and Persistence mode memory grant feedback](../relational-databases/performance/intelligent-query-processing.md#percentile-and-persistence-mode-memory-grant-feedback). Requires enabling Query Store.<br/><br/> - **Persistence**: A capability that allows the memory grant feedback for a given cached plan to be persisted in the Query Store so that feedback can be reused after cache evictions. <br/>- **Percentile**: A new algorithm improves performance of queries with widely oscillating memory requirements, using memory grant information from several previous query executions over, instead of just the memory grant from the immediately preceding query execution. |
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