What is cold backup, hot backup, warm backup recovery?
What is cold backup, hot backup, warm backup recovery?
Cold backup (All these files must be backed up at the same time, before the
databaseis restarted). Hot backup (official name is ‘online backup’) is a
backup taken of each tablespace while the database is running and is being
accessed by the users.
Is the JDBC-ODBC Bridge multithreaded?
No. The JDBC-ODBC Bridge does not support concurrent access from
different threads. The JDBC-ODBC Bridge uses synchronized methods to
serialize all of the calls that it makes to ODBC. Multithreaded Java
programs may use the Bridge, but they won’t get the advantages of
multithreading.
What is an Applet? Should applets have constructors?
Applets are small programs transferred through Internet, automatically
installed and run as part of web-browser. Applets implements functionality
of a client. Applet is a dynamic and interactive program that runs inside a
Web page displayed by a Java-capable browser. We don’t have the concept
of Constructors in Applets. Applets can be invoked either through browser
or through Appletviewer utility provided by JDK.
Can main method be declared final?
Yes, the main method can be declared final, in addition to being public
static.
Can a public class MyClass be defined in a source file named
YourClass.java?
No the source file name, if it contains a public class, must be the same as the
public class name itself with a .java extension.
What is the default value of the local variables?
The local variables are not initialized to any default value, neither
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