Time spent by the various sessions either consuming or waiting for CPU cycles. This reading is an aggregation of CPU Usage and CPU Wait, which are both taken directly from the operating system (rather than MSSQL wait states).
Number of seconds a page will stay in the buffer pool without references. Low values of this metric require the buffer pool to frequently flush the page to the physical disk, thereby possibly indicating a memory issue. Such an issue should be investigated to see if it results from lack of physical memory, inefficient queries and so on.
If the server on which SQL Server is running has multiple CPU cores, SQL Server can run a single query in parallel, using multiple threads. In addition to running user queries on multiple processors, SQL Server can also use multiple threads to build indexes. Typically, queries that make heavy use of CPU cycles are good candidates for parallel execution. For example, a query joining several large tables and sorting the output before returning it to the user is likely to benefit from a parallel execution plan.
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