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NEW QUESTION 20
When you drop an external DELTA table using the SQL Command DROP TABLE table_name, how does it impact metadata(delta log, history), and data stored in the storage?
- A. Drops table from metastore, metadata(delta log, history)but keeps the data in storage
- B. Drops table from metastore, metadata(delta log, history)and data in storage
- C. Drops table from metastore, data but keeps metadata(delta log, history) in storage
- D. Drops table from metastore, but keeps metadata(delta log, history)and data in storage
- E. Drops table from metastore and data in storage but keeps metadata(delta log, history)
Answer: D
Explanation:
Explanation
The answer is Drops table from metastore, but keeps metadata and data in storage.
When an external table is dropped, only the table definition is dropped from metastore everything including data and metadata(Delta transaction log, time travel history) remains in the storage. Delta log is considered as part of metadata because if you drop a column in a delta table(managed or external) the column is not physically removed from the parquet files rather it is recorded in the delta log. The delta log becomes a key metadata layer for a Delta table to work.
Please see the below image to compare the external delta table and managed delta table and how they differ in how they are created and what happens if you drop the table.
Diagram Description automatically generated
NEW QUESTION 21
Which of the following SQL commands are used to append rows to an existing delta table?
- A. APPEND INTO DELTA table_name
- B. UPDATE table_name
- C. APPEND INTO table_name
- D. COPY DELTA INTO table_name
- E. INSERT INTO table_name
Answer: E
Explanation:
Explanation
The answer is INSERT INTO table_name
Insert adds rows to an existing table, this is very similar to add rows a traditional Database or Da-tawarehouse.
NEW QUESTION 22
What are the different ways you can schedule a job in Databricks workspace?
- A. Continuous, Incremental
- B. Cron, On Demand runs
- C. Cron, File notification from Cloud object storage
- D. On-Demand runs, File notification from Cloud object storage
- E. Once, Continuous
Answer: B
Explanation:
Explanation
The answer is, Cron, On-Demand runs
Supports running job immediately or using can be scheduled using CRON syntax
NEW QUESTION 23
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