Database-Scoped Optimize For Ad Hoc Workloads

Joe Sack introduces a new database-scoped configuration option:

SQL Server provides the “optimize for ad hoc workloads” server-scoped option that is used to reduce the memory footprint of single use ad hoc batches and associated plans.  When enabled at the SQL Server instance scope, the “optimize for ad hoc workloads” option stores a reduced-memory compiled plan stub on the first execution of an ad hoc batch for any database on the instance. This server option has been available in SQL Server for several years now, but until recently there hasn’t been a way to enable this option in Azure SQL Database for individual databases.

We are now introducing a new database scoped configuration called OPTIMIZE_FOR_AD_HOC_WORKLOADS which enables this behavior at the database scope in Azure SQL Database.

I’m not sure if this will make it to the on-prem product, and if it does, I’m not sure how useful it would be in practice.  But it is good that we can use it in Azure SQL Database.

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