> For the complete documentation index, see [llms.txt](https://docs.ngsurvey.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ngsurvey.com/fr/installation-setup/installation/cluster-scale-out-configuration.md).

# Configuration de cluster / mise à l’échelle horizontale

Configurez plusieurs serveurs pour les Sondages à forte demande

Pour améliorer les performances, ngSurvey met en cache certaines parties des données sur le serveur ; si vous exécutez sur un cluster ou sur plusieurs serveurs partageant la charge, vous devez activer le caching distribué afin de vous assurer que tous les nœuds de votre cluster disposent des mêmes données à jour.

Pour activer le caching distribué, vous pouvez définir la valeur de la variable d’environnement suivante sur true.

<pre><code><strong>NGSurvey:DistributedCache
</strong></code></pre>


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