IBM Switch 15 Manuel d'utilisateur Page 245

  • Télécharger
  • Ajouter à mon manuel
  • Imprimer
  • Page
    / 270
  • Table des matières
  • MARQUE LIVRES
  • Noté. / 5. Basé sur avis des utilisateurs
Vue de la page 244
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.
Vue de la page 244
1 2 ... 240 241 242 243 244 245 246 247 248 249 250 ... 269 270

Commentaires sur ces manuels

Pas de commentaire