Virtual Private Database in Oracle Enterprise 11g

Oracle Enterprise Database11g has the Virtual Private Database feature to provide security features to your database. Virtual Private Database or VPD is very useful in situations when associated database roles and standard object privileges cannot provide application security requirements. You can set the Virtual Private Database policies to be simple or complex depending upon the amount of security you need to provide to the database.

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You can create a secure virtual private database to keep it safe from unauthorized access. Virtual private database is used in environment where multiple users access the same database and only specific information should be available to each group. The best way to secure your virtual private database is to implement security features during its creation or designing. The level of security is very high as you secure your database instead of controlling it with some other application.



Best way is to associate security policies with the views and tables of the database. It is designed in such a way that security policy is implemented whether you access the data directly or indirectly. What is more? You can also define security policies for a set of statements that eliminates the need to develop security policies individually for all statements. It is also possible to apply multiple policies for a group of views, synonym or tables.

A new feature known as Column Masking is also used with Virtual Private Database which overcomes the drawbacks of Column relevance. Main problem with column level Virtual Private Database security was that it restricted the rows that contains data for sensitive columns. However, with column masking the data of all such rows is displayed where the sensitive columns have null value. This way more information is available for the authorized users and only the sensitive information is hidden.

Virtual Private Database can be made more secure by providing security at the column or row level by combining VPD with application context feature. Providing security at such deep levels was termed as fine-grained access control or FGAC where you can secure a row or column separately also. Whenever a DML or DDL query is initiated by the user Oracle Database dynamically modifies the query before data retrieval or data manipulation. However, the user is unaware of the security procedures followed at back end, as it is transparent for users and whenever he or she access the data only the authorized information is shown. Moreover, you need not to modify your application code whenever you want to change any of the security policies. Just change the Virtual Private Database policies to grant or deny access to any part of database. Irrelevant of the fact that you use any source to connect to the database, that is, whether you use an application, SQL or web interface, there is no way by which your application security can be infected.

Various other types of VPD policy types such as Static, Shared and Context-Sensitive are also used to provide a better level of security. You may use context-sensitive and static policies to secure multiple database objects. Shared policies would save your overheads on re-executing policy functions repetitively for every query.

What Employers Seek In Oracle Candidates

There are hundreds, if not thousands, of high tech computer jobs open for those
with Oracle expertise. The highly reputable and popular Oracle products are used
by firms in every part of the globe. As a result, experts who can walk in the
door ready to start work on Oracle and keep the applications running efficiently
are in great demand.



Knowing what employers are looking for when they seek to hire for high tech
Oracle computer jobs helps students or would-be students and job candidates
prepare their skills. So, let's take a look at a few of these Oracle jobs
available now.



In Phoenix Arizona, for example, we found 58 Oracle related high tech computer
job openings. Positions included Windows Administrator II and III, business
analyst and Oracle developer, database management senior specialist for Oracle
10g, Oracle DBA and senior Oracle DBA, business applications analyst, clinical
applications support, Cerner PathNet support analyst, Oracle / Java developer,
and database manager, among many others.



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The high tech Windows administrator computer jobs were both senior level
position in a OneNeck Windows administration group. Requirements were ability to
administrate a medium to large environment of Windows server without
supervision. The primary focus of these positions was work on projects directed
by the firm's customer management team.



The employer seeking the business analyst and Oracle developer wants someone
with high tech computer knowledge whose job skills include writing functional
specifications, analysis of programming activities and excellent team and
communication capabilities. The candidate for this Oracle job should have a
strong technical background including business analysis. Development of Crystal
reports experience is a plus as well. This employer specifies that the firm does
not seek DBAs.



A senior level data base management position including 10g RAC specialization
requires two years of Oracle 9g RAC experience and five years of Oracle DBA.
This is not a full time permanent position, but rather a contract position for
one month, with responsibility for decision making critical to the database
architecture, as well as the control and deployment processes to implement and
maintain 10G databases using RAC.



Oracle DBA jobs at the senior level are abundant, full time and contract. One, a
six-month contract position that might be extended to as long as one year, is a
three-day week job. The work will be at two locations fifty miles apart, working
with data services of the firm's clients.



A more entry-level Oracle DBA computer job is as part of a high tech team
environment that supports engineering and MIS groups within the firm. This
employee will focus her or his efforts on product and service support both
internal and external. The specific functions of this high tech Oracle computer
jobs include maintaining the database as well as its applications. Requirements
include technical expertise and user interface capabilities. User support will
be a part of the job tasks too. Knowledge to qualify for this Oracle job include
Oracle database in a Sun environment. At least two years experience with Oracle
DBA is a must.



Additionally, this employer is looking for someone with excellent communication
skills, autonomy, top-notch phone skills and vendor troubleshooting capability.



To land the advertised Oracle applications business analyst position, the
candidate would need experience with Oracle applications and Order management.



For the highly specialized clinical applications support job in the medical
field, the candidate would need to be an registered nurse who also has clinical
application support training as well as Cerner clinical applications help desk
proficiency.



A global provider of business solutions and information technology is seeking a
Cerner PathNet support analyst to support the clinical departments' business
needs for project execution and enhancement. Application support and maintenance
is the primary job task. Problem resolution will include system functions,
operations, reporting, input and output, and general operations. This analyst
will install patches, install vendor fixes to problems, create ad hoc reports
and extraction of data and on call troubleshooting and system support.



The person who lands this high tech Oracle computer job will have knowledge of
service operations in an acute care environment, experience in clinical
applications support, as well as Cerner Classic PathNet and hospital acute care
experience.



Familiarity with Cerner Millennium Lab application, Oracle database tools and
VMS or AIX operating systems are plusses. Strong problem solving and analytical
skills as well as effective communication skills both written and verbal are
required.