Let's begin by defining the term stream as it applies to the stream API:
A stream operates on a data source, such as an array or a collection. A stream, itself, never provides storage on a data. It simply moves data, possibly filtering, sorting, or otherwise operating on that data is the process. as a genral rule, however a stream operation by itself does not modyfy the data source. For Example: sorting a stream does not change the order of the source. Rather, sorting a stream results in the creation of a new stream that produces the sroted result.
A Simple Stream Example : Let's work through an example that uses streams. The following program creates an ArrayList called myList that holds a collection of integers. Next, it obtains a stream that uses myList as a source.

package streamclasses; import java.util.ArrayList; import java.util.Optional; import java.util.stream.Stream; /** * * @author manoj.vishwakarma */ public class StreamClassDemo { public static void main(String[] args) { //Create a list of integer Values ArrayList<Integer> myList=new ArrayList<Integer>(); myList.add(7); myList.add(18); myList.add(10); myList.add(5); myList.add(24); myList.add(17); myList.add(5); System.out.println("Original Lise:" +myList); //Obtain a stream to the array list. Stream<Integer> myStream=myList.stream(); //Obtain the minimum and maximum value by using of min(), max(), isPresent(), and get() Optional<Integer> minValu=myStream.min(Integer::compare); if(minValu.isPresent()){ System.out.println("Minimum Value:"+minValu.get()); } // Must obtain a new stream because previous call to min() is a terminal opration that consumed the stream //Max value myStream=myList.stream(); Optional<Integer> maxValu=myStream.max(Integer::compare); if(maxValu.isPresent()){ System.out.println("Max Value:"+maxValu.get()); } //Sort the stream by use of sorted() Stream<Integer> sortStream=myList.stream().sorted(); //Display the sorted stream by use of forEacg(). System.out.println("Sorted stream"); sortStream.forEach((n)->System.out.println(n+"")); //Dispaly only the odd values by use of filter() Stream<Integer> oddValue=myList.stream().sorted().filter((n)->(n%2)==1); //Display the sorted stream by use of forEacg(). System.out.println("Odd Values"); oddValue.forEach((n)->System.out.println(n+"")); //Display only the odd value that are greater than 5. Notice That two filter operations are pipelined oddValue=myList.stream().sorted().filter((n)->(n%2)==1) .filter((n)->n>5); System.out.println("Odd Values grater than 5:"); oddValue.forEach((n)->System.out.println(n+"")); } }
OUTPUT:

This command undoes changes made by Oracle Database to the data files that exist when you run the command. FLASHBACK can fix logical failures, but not physical failures
FLASHBACK DATABASE is usually much faster than a RESTORE operation followed by point-in-time recovery because no data files are restored. The time needed to perform FLASHBACK DATABASE depends on the number of changes made to the database since the desired flashback time. On the other hand, the time needed to do a traditional point-in-time recovery from restored backups depends on the size of the database.
For Example :

Note: If Flashback is not working on SQL Tools/Oracle DataTable you can First run the command given below and then run the flashback command.

Multiple DataBase Connection and Data shifting using Spring boot API configuration Example.

      Create Spring Boot Java (Microservices).

Select the technologies and library(Maven Dependency ) to be.