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The number of SQL recompilations. A recompile occurs when an execution plan for an SQL statement needs to be changed, due to implicit or explicit decision.
Implicit recompilations occurs when the data structure (views, tables and their indexes) undergoes changes, or when their statistic data is updated. Explicit recompilations result from procedures that include explicit demand for recompilation (either in the procedure definition or in its execution), or from use of dynamic code, when parameterization is not forced.
Unusually high rate of recompilations vs. compilations ratio indicates that the re-compilation is inefficient, and prevents the use of existing, cached execution plans.
Average duration of the SQL statements that executed during the specified time range.
The percentage of CPU utilization by the SQL Server background services.
Total amount of dynamic memory the server is using for the dynamic SQL cache.
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