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JVM has a method area common across all the threads. It contains per-class elements like constant pool, fields, method local data, method code, constructor codes etc. which are used in class and initialization of objects/interfaces.This method area gets created during JVM start-up. It is generally part of Heap area. It could be of fixed size or vary. Its memory may not be contiguous. JVM implementation can give control to programmer over Method area creation, its sizing etc. If method area memory is not sufficient to satisfy an allocation request then JVM throws OutOfMemoryError.
Since a vector stores elements in the form of objects, you can store objects of various types (heterogeneous) in it.Example:import java.util.*; class Demo{} public class VectorSample { public static void main(String args[]) { Demo obj = new Demo(); Vector v = new Vector(3, 2); System.out.println("Initial size: " + v.size()); System.out.println("Initial capacity: " + v.capacity()); v.addElement(new Integer(1)); v.addElement(new String("krishna")); v.addElement(new Float(3.5f)); v.addElement(obj); System.out.println("Capacity after four additions: " + v.capacity()); } }
We can verify whether the given string is empty using the isEmpty() method of the String class. This method returns true only if length() is 0. Example import java.lang.*; public class StringDemo { public static void main(String[] args) { String str = "tutorialspoint"; // prints length of string System.out.println("length of string = " + str.length()); // checks if the string is empty or not System.out.println("is this string empty? = " + str.isEmpty()); } } Output length of string = 14 is this string empty? = false
In SAP HANA database, you have different system schema. _SYS_BIC schema in SAP HANA database is used to store column views of all the activated objects in HANA repository. When an object is created and activated (HANA Modeling views, Stored Procedures), run time objects are saved under _SYS_BIC/Column views in database.These column views are used by front-end tools like BusinessObjects to get the data in a query.
Note that while modifying or creating the property configuration file, only the property which is different from default value needs to be set. The mistake in property configuration file may result in incorrect action or result of data source.
The add(E e) method of the java.util.ArrayList class appends the specified element E to the end of the list.Example:import java.util.ArrayList; public class ArrayListDemo { public static void main(String[] args) { ArrayList arrlist = new ArrayList(5); arrlist.add(15); arrlist.add(20); arrlist.add(25); for (Integer number : arrlist) { System.out.println("Number = " + number); } } }Output:Number = 15 Number = 20 Number = 25
LinkedList should be used where modifications to a collection are frequent like addition/deletion operations. LinkedList is much faster as compare to ArrayList in such cases. In case of read-only collections or collections which are rarely modified, ArrayList is suitable.
The array is faster in case of access to an element while List is faster in case of adding/deleting an element from the collection.
AUTO_INCREMENT means that the column will get the value automatically. To illustrate it we have created a table ‘employees’ as follows − mysql> Show Create Table employees\G *************************** 1. row *************************** Table: employees Create Table: CREATE TABLE `employees` ( `Id` int(11) NOT NULL AUTO_INCREMENT, `Name` varchar(35) DEFAULT NULL, PRIMARY KEY (`Id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 1 row in set (0.00 sec) From the above result set, we can see that column id is given the auto-increment option. Now, when we will insert the value in Name ... Read More
Index Server is heart of SAP HANA system and is responsible for processing all SQL statements sent to HANA database. This server contains SQL/MDX Processing engine that is responsible to process and analyze data in HANA db.Index Server also contains Persistence layer for scalability and restoration of the system. In case of system failure, power failure or database corruption, Persistence layer is responsible for the restoration of HANA system to last save point.When you are running complex and large calculations, and there is a system failure Persistence layer is used to ensure that transactions are either fully executed or complete ... Read More