ID #1110

Maximiser la vitesse du tOracleInput vers le tOracleOutput

Voici un excellent truc pour optimiser vos alimentations Oracle (parfois jusqu'Ă  X 100).

NB: Alimentations concernées : tOracleInput vers un tOracleOutput (2 bases Oracle différentes). 


Selon les benchmarks réalisés *

Sans optimisations :    10 000 enregistrements chargé en 20 secondes.

Avec Optimisations : 100 000 enregistrements en 2.3 secondes.


 tOracleInput ------>row1 (Main ) ----> tMap ------>OUT1 (Main ) -----> tOracleOutput


Une des bonnes pratiques invite à déclarer dans les jobs une première connexion vers la base source et une seconde vers la base cible, les composants étant ensuite paramétrés pour utiliser ces connexions. Cela permet d'ouvrir une unique session vers chacune des bases, évitant ainsi d'ouvrir plusieurs sessions pour un même client.

Cette solution facilite la maintenance de l'application, elle peut poser par contre parfois certains problèmes de performance. En effet lorsqu'un composant d'insertion utilise ce type de connexion, Talend lui interdit l'utilisation de buffer. En conséquence de quoi les performances s'écroulent. La solution consiste alors à ne pas utiliser une connexion commune mais de la paramétrer sur chacun des composants de type tOracleOutput et (ne pas cocher "USE AN EXISTING CONNECTION").

En plus, pour encore doubler la vitesse (dans plusieurs cas), dans le tOracleInput nous pouvons cocher dans Advanced Setting : "USE CURSOR", et placer une taille de 20 000 ou 40 000, selon le besoin. 

* Les benchmarks ont été réalisés le 2014.02.19 sur Talend 5.2.2r99271 et Oracle 10g( : 

NB : Ceci peut éventuellement s'appliquer à d'autres bases de données (testé avec succès sur DB2 (AS400)).

Tags: tOracleOutput tOracleInput vitesse

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Derničre mise ŕ jour: 2014-04-10 16:25
Auteur: Michel Preti
Révision: 1.2

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