You might want to have the installable cloud app working in the customer-specific database environment. For example, you might want your customers to connect with different databases based on their login credentials. To do that, you can
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define different database connection caches for different customers and then specify the CacheName value in DBParm (See Using CacheName property of DBParm for details), or
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define different cache groups for different customers (each group contains one or more caches) and then specify the CacheGroup value in DBParm. See Using CacheGroup property of DBParm for details.
For more about database connections, see Working with Database Connections.