# Non-durable gateway deduplication persistence


> [!CAUTION]
> All information stored is discarded when the process ends. This can result in more-than-once message delivery.

The non-durable gateway deduplication persistence uses a least-recently-used (LRU) cache. By default this cache can contain up to 10,000 items. The maximum size can be changed using the following API:

<!-- snippet: NonDurableDeduplicationConfigurationCacheSize -->

```cs
var gatewayStorageConfiguration = new InMemoryDeduplicationConfiguration
{
    CacheSize = 50000
};

endpointConfiguration.Gateway(gatewayStorageConfiguration);
```

<!-- endsnippet -->