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add maxOfflineRequests info #882

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Sep 13, 2019
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add maxOfflineRequests info #882

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2 changes: 2 additions & 0 deletions pages/en/lb3/Defining-data-sources.md
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Expand Up @@ -141,6 +141,8 @@ You can use different data source definitions (including database credentials) f
environment variable, as explained in [Environment-specific configuration](Environment-specific-configuration.html#data-source-configuration),
for example `datasources.production.json` for production environment when NODE_ENV is 'production'.

Additionally, Node.js has a [default of 10 maximum listeners](https://nodejs.org/api/events.html#events_eventemitter_defaultmaxlisteners), but if you exceed this number, a warning is thrown. To avoid this warning, you can change this number by setting the `maxOfflineRequests` setting to a higher number. By default, LoopBack uses 16 as the maximum amount.

## Using multiple data source configurations

LoopBack merges environment-specific configurations (for example in `datasources.production.json`) with the baseline configuration in `datasources.json`.
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