@Adi Jabkowsky,
New hive entities will be synced automatically if you enable "Hive Atlas Hook" in hive configs. Whenever you create a database or table, a message is posted to kafka topic using hive hooks and the same message is read by atlas and the corresponding entity is created in Atlas.
For testing, you can create a sample database,table and check in Atlas UI
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Please "Accept" the answer if this is helpful.
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-Aditya