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August 2012

Xplan: now with “self” measures for row source operations

One of the most useful information that the Oracle kernel attaches to plans in the library cache are measures of various resource consumption figures, such as elapsed time, consistent and current gets, disk reads, etcetera. These can be made available for each plan line (aka “row source operation”).

These figures are always cumulative, that is, include both the resource consumed by the line itself and all of its progeny.…

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