May 2019
Intermediate to advanced
484 pages
11h 23m
English
Content preview from Learn T-SQL Querying
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Actual Number of Rows
Similarly, having information on the actual number of rows that flowed through the operators allows database professionals to track the most expensive areas of a plan. The Actual Number of Rows (ActualRows* in showplan XML) shows the number of rows output by an operator after any predicates were applied. The Number of Rows Read (ActualRowsRead* in showplan XML) shows the number of rows read before predicates were applied.
In the following screenshot, we see the detail for both properties in the same clustered index scan:
Thread zero is the coordinating thread and does not accumulate I/O, which is handled by all the other ...
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