Sqoop Interview Questions

Sqoop Interview Questions and Answers

Sqoop interview questions and answers are helpful at the time of giving an interview on Hadoop. Sqoop is used in multiple companies where we use Hadoop. While giving the interview on Hadoop technology sqoop tools questions and answers are very helpful. At the time of applying for the post of Hadoop then we need to prepare the question and answer of sqoop technology. Sqoop is the tool of Hadoop.

Sqoop Interview Questions and Answers

Top 15 Sqoop Interview Questions and Answers

Below are the top question and answers of the Sqoop as follows. These questions are helpful while giving mock tests or interviews.

Q1. Which default database is used in sqoop?

Answer:

Sqoop uses different databases, but it will use MySQL as the default database. Sqoop uses the multiple RDBMS database for importing and exporting the data from HDFS. We use sqoop in Hadoop to import and export data as required.

Q2. How can we execute the SQL query in sqoop to import the rows?

Answer:

While using the –m 1 option in the import command we can import the rows from sqoop. This command creates a single MapReduce task and then we can import the rows directly.

Q3. What is apache sqoop?

Answer:

By using apache sqoop we import the data from multiple types of databases. Sqoop is also used to import the data from the file of Hadoop. Sqoop provides mainly two facilities like sqoop import and sqoop export. We can also use sqoop to extract the data.

Q4. What we’ve understood from the sqoop eval?

Answer:

The sqoop eval is used for sample demo at the time of importing data. We run a sample RDBMS query using this tool. After running the RDBMS query we can examine the result of a query by using the console. By using the eval tool it is possible to recognize the output and also need to know what kind of data we are importing.

Q5. Is Sqoop using MapReduce techniques or not?

Answer:

Sqoop uses MapReduce techniques for the parallel exports and imports of data between the Hadoop file system and database. We are using MapReduce in sqoop only for fault resistance.

Q6. What default file format is used in sqoop while importing the data?

Answer:

Sqoop imports the data by using two file formats i.e. delimited and sequence file formats. The delimited file format is the default file format used by sqoop and it is used to import the data. The delimited file format will explicitly uses the –as-textfile argument. At the time of passing an argument by using a command then the string produces the string-based representations. The sequence file format in sqoop is a binary format. In this file format record is stored in record-specific data types which are shown by java classes.

Q7. How can we execute the free-form query in sqoop?

Answer:

We execute a free-form query in sqoop to import the rows sequentially. We are using –m 1 options for the same. This option creates only the map-reduce task. So we can import the rows directly.

Q8. What is the use of sqoop merge?

Answer:

Sqoop merge is a tool used to combine two different datasets. We can override the entire dataset by using this tool. The sqoop merge provides the flattening process at the time of merging two datasets. We need to use the merge key command. It is very useful while transferring a large amount of data between Hadoop and RDBMS databases.

Q9. What is the use of –the compress-codec parameter?

Answer:

This parameter is used to get the export files by using sqoop import which is mentioned in the formats.

Q10. Is the JDBC driver capable of using sqoop while connecting to the database?

Answer:

The JDBC driver is not fully capable of connecting to the database. A connector and JDBC driver are required to connect to the database. When connecting to any RDBMS system, we require a connector and an FDBC driver. We cannot connect to the database server without a connector.

Q11. What is the use of –directive mode in sqoop?

Answer:

We use –directive mode to import single as well as multiple tables into the Hbase or HDFS. This mode is very useful while using the sqoop tool.

Q12. What is the use of export in sqoop?

Answer:

The sqoop export will transfer data from Hadoop to RDBMS. It will fetch the table before transferring. After fetching the table, it will be made available on the database server. To export the database or tables created by sqoop, we use the sqoop export command.

Q13. What are the benefits of using sqoop?

Answer:

Below are the benefits of apache sqoop as follows. It contains multiple benefits at the time using it while importing and exporting data.

Parallel data transmission – It uses the YARN for the data import and export process. It also provides the facility of fault tolerance.
Essential data import – By using sqoop we can import the required data. We can also import the specified rows from all the rows in the table.
Supporting all RDBMS – Sqoop supports all RDBMS. Majorly it will be supporting MySQL, MSSQL, Oracle, and many more RDBMS database systems.
Loads data into HDFS – It imports the data from the RDBMS database into the HDFS.
Easy data loading – While using sqoop we can easily load the data from any of the RDBMS.

Q14. Which command we are using in sqoop?

Answer:

At the time of working with sqoop, we are using the below commands as follows. Import and export are mostly used.

Export
Import all tables
Create
Codegen
Eval
Version
List tables
List all databases

Q15. What are the features of sqoop?

Answer:

Sqoop contains several features as follows.

Compression
Parallel import and export
Connect to all RDBMS
Directly loading data into Hbase
Full load
High security
Incremental load

Conclusion

In this article, we have explained the top questions and answers to the sqoop framework. These questions and answers are very useful at the time of giving the interview and attending any test related to Hadoop or HDFS.