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Problem Scenario 1:
You have been given MySQL DB with following details.
jdbc URL = jdbc:mysql://quickstart:3306/retail_db
Please accomplish following activities.
1 . Connect MySQL DB and check the content of the tables.
2 . Copy "retaildb.categories" table to hdfs, without specifying directory name.
3 . Copy "retaildb.categories" table to hdfs, in a directory name "categories_target".
4 . Copy "retaildb.categories" table to hdfs, in a warehouse directory name
See the explanation for Step by Step Solution and configuration.
Solution :
Step 1 : Connecting to existing MySQL Database mysql --user=retail_dba -- password=cloudera retail_db
Step 2 : Show all the available tables show tables;
Step 3 : View/Count data from a table in MySQL select count(1} from categories;
Step 4 : Check the currently available data in HDFS directory hdfs dfs -Is
Step 5 : Import Single table (Without specifying directory).
sqoop import --connect jdbc:mysql://quickstart:3306/retail_db -username=retail_dba - password=cloudera -table=categories
Note : Please check you dont have space between before or after '=' sign. Sqoop uses the
MapReduce framework to copy data from RDBMS to hdfs
Step 6 : Read the data from one of the partition, created using above command, hdfs dfs - catxategories/part-m-00000
Step 7 : Specifying target directory in import command (We are using number of mappers
= 1, you can change accordingly) sqoop import -connect
jdbc:mysql://quickstart:3306/retail_db -username=retail_dba -password=cloudera
~ table=categories -target-dir=categortes_target --m 1
Step 8 : Check the content in one of the partition file.
hdfs dfs -cat categories_target/part-m-00000
Step 9 : Specifying parent directory so that you can copy more than one table in a specified target directory. Command to specify warehouse directory.
sqoop import -.-connect jdbc:mysql://quickstart:3306/retail_db --username=retail dba - password=cloudera -table=categories -warehouse-dir=categories_warehouse --m 1

You create a class that uses unmanaged resources.
You need to ensure that users of the class can explicitly release resources when the instance of the class is no longer required.
Which two actions should you perform? (Each correct answer presents part of the solution. Choose two.)
A. Implement the IDisposable interface.
B. Use a class destructor that calls the Kill method.
C. Inherit from the WeakReference class.
D. Use a class destructor that is called from within the Dispose method.
Answer: A,D
To properly dispose of unmanaged resources, it is recommended that you implement a public Dispose or Close method that executes the necessary cleanup code for the object. The IDisposable interface provides the Dispose method for resource classes that implement the interface. Because it is public, users of your application can call the Dispose method directly to free memory used by unmanaged resources. When you properly implement a Dispose method, the Finalize method becomes a safeguard to clean up resources in the event that the Dispose method is not called.
Reference: Cleaning Up Unmanaged Resources

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