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I have a lightning component which needs to be refreshed when a record is changed in the database. Can I use lightning Data Services or must I use the Streaming API?

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A Lightning Data Service record will only update on-screen if the record is edited/updated in another Lightning Data Service context.

So, assuming that the database change is not done by the same user, I would suggest using Streaming API, or an on-screen polling mechanism that does calls to APEX.

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