SQL Injection (dbms_assert)
Using SQL injection, a hacker can pass string input to an application in hopes of gaining unauthorized access to a database. Here is a nice tutorial about this subject and how to prevent it. It shows also the use of the undocumented (in 10g not in 11g) dbms_assert Package.
Oracle Clusterware: Third Voting disk on NFS
A voting disk is a critical file for Oracle Clusterware. You must have at least 3 voting disks. If you have „only“ two SAN then you can configure the third on a NFS share.
Oracle supports now a third voting disk on NFS for HPUX. But only for HPUX 11.31 and Oracle Clusterware 10.2.0.2 onwards.
This white paper describse how to configure it:
Using standard NFS to support a third voting disk on an Extended Distance cluster configuration on Linux,AIX,HP, or Solaris (PDF)
Inheritance and Interface in Java
Here are some possibilities of how to use and mix inheritances and interfaces in Java.
implements: implements an interface to the class
extends: extends the subclass from the superclass
interface Ione {}
interface Itwo {}
interface Ithree extends Ione {}
interface Ifour extends Ione, Itwo {}
class Cone {}
class Ctwo extends Cone {}
class Cthree implements Ione {}
class Cfour extends Cone implements Ione {}
class Cfive extends Cone implements Ione, Itwo {}
