Which of the following code blocks will remove the rows where the value in column age is greater than 25 from the existing Delta table my_table and save the updated table?
Answer(s): C
A data engineer has realized that they made a mistake when making a daily update to a table. They need to use Delta time travel to restore the table to a version that is 3 days old. However, when the data engineer attempts to time travel to the older version, they are unable to restore the data because the data files have been deleted.Which of the following explains why the data files are no longer present?
Answer(s): A
The most likely reason why the data files are no longer present when the data engineer attempts to time travel to an older version of a Delta table is that the VACUUM command was run on the table. The VACUUM command removes files that are no longer in use by the Delta table, including files that are required for time travel. Therefore, if the VACUUM command is run on a Delta table, it can make it impossible to use time travel to recover older versions of the table.
Which of the following Git operations must be performed outside of Databricks Repos?
Answer(s): E
For following tasks, work in your Git provider:Create a pull request.Resolve merge conflicts.Merge or delete branches.Rebase a branch.
https://docs.databricks.com/repos/index.html
Which of the following data lakehouse features results in improved data quality over a traditional data lake?
Answer(s): B
ACID-compliant transactions ensure that data is consistent, reliable, and accurate. By supporting ACID transactions, a data lakehouse can provide improved data quality over a traditional data lake. This is because ACID transactions guarantee that updates to the data are either completed in their entirety or not at all, reducing the risk of data corruption or errors.
A data engineer needs to determine whether to use the built-in Databricks Notebooks versioning or version their project using Databricks Repos.Which of the following is an advantage of using Databricks Repos over the Databricks Notebooks versioning?
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