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In Synapse, we can have the built-in serverless option or we can build our own dedicated pools.
If we want to be more predictive using machine learning, we can use Spark Notebooks.
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Azure Stream Analytics
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Used to analyze large volumes of streaming data from multiple sources.
Helps to extract insight out of data streams by using :
Static or slow-changing reference data (Blob Storage or SQL DB)
Azure ML for complex querying and real-time data scoring
Responds to queries by trigerring communications/workflows or by sending data to dashboards or storage.