Query Store is integrated with the query processor in the database engine. A simplified Query Store architecture in SQL Server 2017 is shown in the following figure:
Query Store architecture
Query Store actually has three stores:
- Query and Plan Store: This stores information about executed queries and execution plans used for their execution
- Runtime Statistics store: This store holds aggregated execution parameters (execution time, logical reads, and so on) for executed queries within a specified time
- Wait Stats Store: This store persists wait statistics information
All three stores have instances in memory and persisted ...
