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Databricks Certified-Data-Engineer-Professional Exam Syllabus Topics:
| Section |
Objectives |
| Topic 1: Monitoring and Alerting |
- Alerting
- 1. Use SQL Alerts for data quality monitoring
- 2. Configure Lakeflow Jobs notifications for job status and performance issues
- Monitoring
- 1. Use Databricks REST APIs and CLI for monitoring jobs and pipelines
- 2. Use Lakeflow Spark Declarative Pipelines event logs for monitoring
- 3. Use system tables for resource, cost, audit, and workload monitoring
- 4. Use Query Profiler and Spark UI to monitor workloads
|
| Topic 2: Developing Code for Data Processing using Python and SQL |
- Building and Testing ETL Pipelines
- 1. Compare streaming tables and materialized views
- 2. Use APPLY CHANGES APIs for change data capture
- 3. Develop unit and integration tests for data processing code
- 4. Create and automate ETL workloads using Jobs through UI, APIs, and CLI
- 5. Compare Spark Structured Streaming and Lakeflow Spark Declarative Pipelines
- 6. Build production-ready batch and streaming pipelines using Lakeflow Spark Declarative Pipelines and Auto Loader
- 7. Use control flow operators in pipeline components
- 8. Configure environments, dependencies, memory, and retry behavior
- Using Python and Tools for Development
- 1. Design and implement scalable Python project structures optimized for Databricks Asset Bundles
- 2. Manage and troubleshoot third-party library installations and dependencies
- 3. Develop User-Defined Functions using Pandas/Python UDFs
|
| Topic 3: Cost & Performance Optimisation |
- Cost Optimization
- 1. Understand how Unity Catalog managed tables reduce operational overhead
- Delta Optimization
- 1. Apply data skipping and file pruning techniques
- 2. Understand deletion vectors and liquid clustering
- 3. Use Change Data Feed to address streaming table limitations and improve latency
- Query Performance
- 1. Use Query Profile to identify performance bottlenecks
- 2. Identify inefficient joins and excessive data shuffling
|
| Topic 4: Data Ingestion & Acquisition |
- Design and implement data ingestion pipelines
- 1. Build append-only pipelines for batch and streaming data using Delta
- 2. Ingest Delta Lake, Parquet, ORC, Avro, JSON, CSV, XML, Text, and Binary data
- 3. Ingest data from message buses and cloud storage
|
| Topic 5: Data Governance |
- Metadata and Discoverability
- 1. Create and maintain descriptions and metadata for enterprise data
- Unity Catalog Permissions
- 1. Understand the Unity Catalog permission inheritance model
|
| Topic 6: Debugging and Deploying |
- Deploying CI/CD
- 1. Build and deploy Databricks resources using Databricks Asset Bundles
- 2. Integrate Git-based CI/CD workflows using Databricks Git Folders
- Debugging and Troubleshooting
- 1. Use Spark UI, cluster logs, system tables, and query profiles for diagnostics
- 2. Analyze errors and remediate failed job runs
- 3. Use Lakeflow Spark Declarative Pipelines event logs and Spark UI for debugging
|
| Topic 7: Data Sharing and Federation |
- Delta Sharing
- 1. Configure Databricks-to-Databricks Sharing
- 2. Configure sharing with external platforms using the open sharing protocol
- 3. Share live Lakehouse data with external computing platforms
- Lakehouse Federation
- 1. Configure Lakehouse Federation with appropriate governance
|
| Topic 8: Data Transformation, Cleansing, and Quality |
- Advanced Data Transformation
- 1. Apply window functions, joins, and aggregations to large datasets
- 2. Write efficient Spark SQL and PySpark transformations
- Data Quality
- 1. Develop data quarantining processes for invalid data
- 2. Apply data quality controls using Lakeflow Spark Declarative Pipelines or Auto Loader
|
| Topic 9: Ensuring Data Security and Compliance |
- Data Security
- 1. Use row filters and column masks for sensitive data
- 2. Use ACLs to secure workspace objects and enforce least privilege
- 3. Apply anonymization and pseudonymization techniques
- Compliance
- 1. Develop data purging solutions according to data retention policies
- 2. Implement pipelines that detect and mask personally identifiable information
|
| Topic 10: Data Modelling |
- Dimensional Modelling
- 1. Design dimensional models for analytical workloads
- Scalable Data Models
- 1. Optimize data layout using Liquid Clustering
- 2. Understand Liquid Clustering versus partitioning and Z-Ordering
- 3. Design and implement scalable data models using Delta Lake
|
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最新的 Databricks Certification Certified-Data-Engineer-Professional 免費考試真題 (Q172-Q177):
問題 #172
A table in the Lakehouse named customer_churn_params is used in churn prediction by the machine learning team. The table contains information about customers derived from a number of upstream sources. Currently, the data engineering team populates this table nightly by overwriting the table with the current valid values derived from upstream data sources.
The churn prediction model used by the ML team is fairly stable in production. The team is only interested in making predictions on records that have changed in the past 24 hours.
Which approach would simplify the identification of these changed records?
- A. Apply the churn model to all rows in the customer_churn_params table, but implement logic to perform an upsert into the predictions table that ignores rows where predictions have not changed.
- B. Replace the current overwrite logic with a merge statement to modify only those records that have changed; write logic to make predictions on the changed records identified by the change data feed.
- C. Calculate the difference between the previous model predictions and the current customer_churn_params on a key identifying unique customers before making new predictions; only make predictions on those customers not in the previous predictions.
- D. Convert the batch job to a Structured Streaming job using the complete output mode; configure a Structured Streaming job to read from the customer_churn_params table and incrementally predict against the churn model.
- E. Modify the overwrite logic to include a field populated by calling
spark.sql.functions.current_timestamp() as data are being written; use this field to identify records written on a particular date.
答案:B
解題說明:
The approach that would simplify the identification of the changed records is to replace the current overwrite logic with a merge statement to modify only those records that have changed, and write logic to make predictions on the changed records identified by the change data feed.
This approach leverages the Delta Lake features of merge and change data feed, which are designed to handle upserts and track row-level changes in a Delta table. By using merge, the data engineering team can avoid overwriting the entire table every night, and only update or insert the records that have changed in the source data. By using change data feed, the ML team can easily access the change events that have occurred in the customer_churn_params table, and filter them by operation type (update or insert) and timestamp. This way, they can only make predictions on the records that have changed in the past 24 hours, and avoid re-processing the unchanged records.
問題 #173
A data team's Structured Streaming job is configured to calculate running aggregates for item sales to update a downstream marketing dashboard. The marketing team has introduced a new field to track the number of times this promotion code is used for each item. A junior data engineer suggests updating the existing query as follows: Note that proposed changes are in bold.
Original query:

Proposed query:

Which step must also be completed to put the proposed query into production?
- A. Increase the shuffle partitions to account for additional aggregates
- B. Remove .option (mergeSchema', true') from the streaming write
- C. Run REFRESH TABLE delta, /item_agg'
- D. Specify a new checkpointlocation
- E. Register the data in the "/item_agg" directory to the Hive metastore
答案:D
解題說明:
When introducing a new aggregation or a change in the logic of a Structured Streaming query, it is generally necessary to specify a new checkpoint location. This is because the checkpoint directory contains metadata about the offsets and the state of the aggregations of a streaming query. If the logic of the query changes, such as including a new aggregation field, the state information saved in the current checkpoint would not be compatible with the new logic, potentially leading to incorrect results or failures. Therefore, to accommodate the new field and ensure the streaming job has the correct starting point and state information for aggregations, a new checkpoint location should be specified.
問題 #174
Incorporating unit tests into a PySpark application requires upfront attention to the design of your jobs, or a potentially significant refactoring of existing code.
Which statement describes a main benefit that offset this additional effort?
- A. Ensures that all steps interact correctly to achieve the desired end result
- B. Validates a complete use case of your application
- C. Yields faster deployment and execution times
- D. Troubleshooting is easier since all steps are isolated and tested individually
- E. Improves the quality of your data
答案:D
解題說明:
Unit tests are small, isolated tests that are used to check specific parts of the code, such as functions or classes.
問題 #175
A data engineer is brining an existing production Databricks job under asset bundle management and wants to ensure that:
- The job's current configuration is captured as YAML, and all
referenced files are included in their bundle project.
- Future changes to the bundle's YAML will update the existing job in-
place (not create a new job)
How should the data engineer successfully move the production job under asset bundle management?
- A. Manually create the YAML configuration for the job in your bundle project, ensuring all settings match the existing job. Then, run Databricks bundle deploy the bundle, which will update the existing job in your workspace.
- B. Run Databricks bundle generate job --existing-job-id to generate the YAML and download referenced files. Then, run Databricks bundle deploy to deploy the bundle, which will always update the existing job automatically.
- C. Export the job definition as JSON, convert it to YAML, and place it in your bundle. Then, run Databricks bundle deploy to update the existing job.
- D. Run databricks bundle generate job --existing-job-id to generate the YAML and download referenced files. Then, run Databricks bundle deployment, bind to link the bundle's job resource to the existing job in Databricks.
答案:D
解題說明:
Generating the bundle from the existing job captures the full job configuration as YAML and pulls in all referenced files into the bundle project. Binding the generated job resource to the existing Databricks job establishes a persistent link, ensuring that future bundle deployments update the same production job in place rather than creating a new one.
問題 #176
The business intelligence team has a dashboard configured to track various summary metrics for retail stories. This includes total sales for the previous day alongside totals and averages for a variety of time periods. The fields required to populate this dashboard have the following schema:

For Demand forecasting, the Lakehouse contains a validated table of all itemized sales updated incrementally in near real-time. This table named products_per_order, includes the following fields:

Because reporting on long-term sales trends is less volatile, analysts using the new dashboard only require data to be refreshed once daily. Because the dashboard will be queried interactively by many users throughout a normal business day, it should return results quickly and reduce total compute associated with each materialization.
Which solution meets the expectations of the end users while controlling and limiting possible costs?
- A. Define a view against the products_per_order table and define the dashboard against this view.
- B. Configure a webhook to execute an incremental read against products_per_order each time the dashboard is refreshed.
- C. Use the Delta Cache to persists the products_per_order table in memory to quickly the dashboard with each query.
- D. Use Structure Streaming to configure a live dashboard against the products_per_order table within a Databricks notebook.
- E. Populate the dashboard by configuring a nightly batch job to save the required values as a table overwritten with each update.
答案:E
問題 #177
......
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