IBM Switch 15 Manuale Utente Pagina 245

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235
Performance Considerations for Streams and Nodes
offset v alue is not a literal integer; for example, @OFFSET(Sales, Month). The offset value is the
eld name Mont
h, whose value is unk nown until executed. The s erver must save all values of the
Sales eld to ensure accurate results. Where an uppe r bound is known, you should provide it as
an additional argument; for exa mple, @OFFSET(Sales, Month, 12). This operation instructs the
server to sto
re no more than the 12 most recent values of Sales. Sequence functions, bounded o r
otherwise, almost always inhibit SQL generation.
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