May 2019
Intermediate to advanced
484 pages
11h 23m
English
Content preview from Learn T-SQL Querying
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Actual Time Statistics
Time is an important measurement, not only by itself, but because these properties track the time in milliseconds an operator spent during execution. As such, comparing these with waits accrued during execution, and the overall query elapsed execution time, allows database professionals to pinpoint expensive areas of the plan with great accuracy.
The Actual Elapsed CPU Time (ms) (ActualCPUms* in showplan XML) shows the CPU time accumulated over all threads, with details on each thread for parallel queries. The Actual Elapsed Time (ms) (ActualElapsedms* in showplan XML) shows the elapsed time the operator took to execute. Although there is detail on each thread for parallel queries, the overall elapsed time is the same ...
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