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Update intelligent-query-processing-memory-grant-feedback.md #10365

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4 changes: 1 addition & 3 deletions ...nal-databases/performance/intelligent-query-processing-memory-grant-feedback.md
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Expand Up @@ -188,12 +188,10 @@ This feature was introduced in [!INCLUDE [ssSQL22](../../includes/sssql22-md.md)

- Percentile memory grant feedback is enabled by default in [!INCLUDE [ssSQL22](../../includes/sssql22-md.md)], but has no effect if Query Store isn't enabled or when Query Store isn't in a "read write" state.

- Persistence for memory grant, CE, and DOP feedback is on by default in [!INCLUDE [ssSQL22](../../includes/sssql22-md.md)], but has no effect when Query Store isn't enabled or when Query Store isn't in a "read write" state.
- Persistence for memory grant, CE, and DOP feedback is on by default in [!INCLUDE [ssSQL22](../../includes/sssql22-md.md)] and [!INCLUDE [ssazuremi-md](../../includes/ssazuremi-md.md)], but has no effect when Query Store isn't enabled or when Query Store isn't in a "read write" state.

- Percentile and persistence for memory grant feedback is available in [!INCLUDE [ssazure-sqldb](../../includes/ssazure-sqldb.md)], and enabled by default on all databases, both existing and new.
Comment on lines 189 to 193

- Percentile and persistence for memory grant feedback isn't currently available in [!INCLUDE [ssazuremi-md](../../includes/ssazuremi-md.md)].

It's recommended that you have a performance baseline for your workload before the feature is enabled for your database. The baseline numbers will help you determine if you're getting the intended benefit from the feature.

Memory grant feedback (MGF) is an existing feature that adjusts the size of the memory allocated for a query based on past performance. However, the initial phases of this project only stored the memory grant adjustment with the plan in the cache – if a plan is evicted from the cache, the feedback process must start again, resulting in poor performance the first few times a query is executed after eviction. The new solution is to persist the grant information with the other query information in the Query Store so that the benefits last across cache evictions. Memory grant feedback persistence and percentile address existing limitations of memory grant feedback in a non-intrusive way.
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