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NEW QUESTION # 31
A data engineer is attempting to grant a user access to a view. They successfully run GRANT SELECT ON VIEW sales_catalog.market_data.summary TO analyst_group.
However, the analyst still receives an "Insufficient Permissions" error when trying to query the view.
In which order should the engineer verify the Hierarchy of Securable Objects to ensure the analyst has the necessary usage permissions?
Answer: A
Explanation:
To query the view, the analyst needs USE CATALOG on sales_catalog, then USE SCHEMA on market_data, and SELECT on summary. Privileges on the underlying tables are not required for querying a Unity Catalog view.
NEW QUESTION # 32
A data engineer is working with a very large dataset and wants to improve query performance by colocating related data in the same files. The engineer decides to apply Z-ordering on frequently filtered columns. Which Delta Lake command is used?
Answer: C
NEW QUESTION # 33
Which of the following must be specified when creating a new Delta Live Tables pipeline?
Answer: D
Explanation:
Explanation
https://docs.databricks.com/en/delta-live-tables/tutorial-pipelines.html
NEW QUESTION # 34
In which of the following scenarios should a data engineer use the MERGE INTO command instead of the INSERT INTO command?
Answer: D
Explanation:
The MERGE INTO command is used to perform upserts, which are a combination of insertions and updates, based on a source table into a target Delta table1. The MERGE INTO command can handle scenarios where the target table cannot contain duplicate records, such as when there is a primary key or a unique constraint on the target table. The MERGE INTO command can match the source and target rows based on a merge condition and perform different actions depending on whether the rows are matched or not. For example, the MERGE INTO command can update the existing target rows with the new source values, insert the new source rows that do not exist in the target table, or delete the target rows that do not exist in the source table1.
The INSERT INTO command is used to append new rows to an existing table or create a new table from a query result2. The INSERT INTO command does not perform any updates or deletions on the existing target table rows. The INSERT INTO command can handle scenarios where the location of the data needs to be changed, such as when the data needs to be moved from one table to another, or when the data needs to be partitioned by a certain column2. The INSERT INTO command can also handle scenarios where the target table is an external table, such as when the data is stored in an external storage system like Amazon S3 or Azure Blob Storage3. The INSERT INTO command can also handle scenarios where the source table can be deleted, such as when the source table is a temporary table or a view4. The INSERT INTO command can also handle scenarios where the source is not a Delta table, such as when the source is a Parquet, CSV, JSON, or Avro file5.
1: MERGE INTO | Databricks on AWS
2: [INSERT INTO | Databricks on AWS]
3: [External tables | Databricks on AWS]
4: [Temporary views | Databricks on AWS]
5: [Data sources | Databricks on AWS]
NEW QUESTION # 35
A data engineer has a Job with multiple tasks that runs nightly. Each of the tasks runs slowly because the clusters take a long time to start.
Which of the following actions can the data engineer perform to improve the start up time for the clusters used for the Job?
Answer: E
Explanation:
The best action that the data engineer can perform to improve the start up time for the clusters used for the Job is to use clusters that are from a cluster pool. A cluster pool is a set of idle clusters that can be used by jobs or interactive sessions. By using a cluster pool, the data engineer can avoid the cluster creation time and reduce the latency of the tasks. Cluster pools also offer cost savings and resource efficiency, as they can be shared by multiple users and jobs.
Option A is not relevant, as endpoints available in Databricks SQL are used for creating and managing SQL analytics workloads, not for improving cluster start up time.
Option B is not correct, as jobs clusters and all-purpose clusters have similar start up times. Jobs clusters are clusters that are dedicated to run a single job and are terminated when the job is completed. All-purpose clusters are clusters that can be used for multiple purposes, such as interactive sessions, notebooks, or multiple jobs. Both types of clusters can benefit from using a cluster pool.
Option C is not advisable, as configuring the clusters to be single-node will reduce the parallelism and performance of the tasks. Single-node clusters are clusters that have only one worker node and are typically used for testing or development purposes. They are not suitable for running production jobs that require high scalability and fault tolerance.
Option E is not helpful, as configuring the clusters to autoscale for larger data sizes will not affect the start up time of the clusters. Autoscaling is a feature that allows clusters to dynamically adjust the number of worker nodes based on the workload. It can help optimize the resource utilization and cost efficiency of the clusters, but it does not speed up the cluster creation process.
Cluster Pools
Jobs
Clusters
[Databricks Data Engineer Professional Exam Guide]
NEW QUESTION # 36
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