Databricks Certified Data Engineer Associate Practice Mode

Community Discussion

Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.

• Chose A0

  - Correct answer : A — `rescue`, which prevents schema evolution and captures unexpected columns in the rescued data column instead of failing the stream. A . The `rescue` mode is built exactly for this case: it blocks automatic schema evolution and instead captures unexpected column values in the rescued data column without ever failing the stream. B . The `none` mode avoids failure but simply ignores unexpected columns, meaning their values are not preserved anywhere, which fails the second requirement. C . The `addNewColumns` mode does preserve new columns by evolving the schema, but it still interrupts the stream with an exception, which fails the no-failure requirement. D . The `failOnNewColumns` mode does the opposite of what is needed, halting the stream indefinitely until a person manually supplies an updated schema.