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Identify the missing word(s) in the following sentence within the context of Microsoft Azure. Collecting data in any system has an execution cost of CPU cycles, memory, and disk utilization that is known as observer overhead. The [?] is designed to minimize the impact of its data collection. Data for the [?] is written to memory for each new query, and each execution of an existing query. If this information was written to disk for each execution, the performance overhead would be significant, so SQL Server uses a setting called DATA_FLUSH_INTERVAL_SECONDS to control the frequency of flushing the [?] data to disk.