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On 16/10/11 20:22, Sreekumar TP wrote:
> Does the first execution of step cache the entire result set and tje
> subsequent steps get the results from the cache?

No, the first execution does the minimum amount of work necessary in order
to get you the first result row.  Subsequent steps do only the work
necessary to get the next row.

However if your query needs the rows to be sorted then all of the result
rows will have to be found first in order to do the sorting.  (Some sorts
can be satisfied from an index.)

Roger
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