Page History

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Indicates the percentage of CPU time spent by all processes, on the computer hosting the SQL Server instance, executing in User mode. 

Page Life Expectancy

The number of seconds a page stays in the buffer pool without references. 

Procedure Cache Hit Ratio (Percent)

The ratio of procedure cache hits to procedure cache lookups.This indicates when an execution plan is reused from memory as opposed to compiled from disk. 

SQL Server CPU Usage (Percent)

Indicates the percentage of the total CPU used by the SQL Server instance. 

SQL Server Memory Usage (Percent)

Indicates the percentage of total memory used by SQL Server.

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