Sqoop 面试题与答案
问题 21. Explain the purpose of the --boundary-query option in Sqoop.
The --boundary-query option allows you to specify a SQL query that is used to determine the range of values for the splitting column.
Example:
sqoop import --connect jdbc:mysql://localhost:3306/db --table mytable --boundary-query SELECT MIN(id), MAX(id) FROM mytable
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问题 22. How can you import data into Hive using Sqoop?
You can import data into Hive using Sqoop by specifying the --hive-import option along with the target Hive table using --hive-table.
Example:
sqoop import --connect jdbc:mysql://localhost:3306/db --table mytable --hive-import --hive-table myhivetable
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问题 23. What is the purpose of the --columns option in Sqoop?
The --columns option allows you to specify a comma-separated list of columns to import, excluding others from the source table.
Example:
sqoop import --connect jdbc:mysql://localhost:3306/db --table mytable --columns id,name
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问题 24. Explain the purpose of the --hive-overwrite option in Sqoop.
The --hive-overwrite option in Sqoop is used to overwrite existing data in the Hive table during import.
Example:
sqoop import --connect jdbc:mysql://localhost:3306/db --table mytable --hive-import --hive-table myhivetable --hive-overwrite
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问题 25. What is the purpose of the --fetch-size option in Sqoop?
The --fetch-size option specifies the number of rows to fetch in each round trip between Sqoop and the database during import.
Example:
sqoop import --connect jdbc:mysql://localhost:3306/db --table mytable --fetch-size 100
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