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.

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.





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Search engine optimization is the activity of improving the volume and quality of real time traffic to web pages or whole sites from search engines through natural search results for targeted keywords. Most often a website that gets a higher position or ranking in the search results is the one which the searchers will visit more frequently. Therefore, it is important that a site is optimized to get real time traffic the right way to make it more search-engine friendly and get a higher rank in the search results.

Though SEO helps in boosting real time traffic to a website, it should not be considered as the marketing of the site. It may be easy for one to pay and appear in the paid search results for a set of keywords, however, the concept behind the SEO technique is to get the topmost ranking without paying since your site is relevant to the search query entered by the user.

The amount of time that can be spent on optimizing a website to get real time traffic can range from a few minutes to a long term activity. If your product or service is such that the keywords used are uncommon, then some general SEO would be sufficient to get a top rating. However, if your product or service industry is competitive or is in a saturated market, then it is important to dedicate considerable amount of time and effort for SEO. Even if one decides on simple SEO solutions, it is necessary to understand how search engine algorithms work and which items are crucial in SEO to get real time traffic.

The marketing approach that SEO adopts for increasing a site’s relevance is consideration of how search engines work and what searches are performed by users. The SEO process attempts to concentrate its efforts on a site’s coding, presentation, structuring, and also resolving issues that prevent search engine indexing program from spidering a website entirely.

Additionally, SEO efforts also include inserting unique content to web pages to make it more attractive to users and also to ensure that the search engine robots can easily index the content. Optimizing a site to get real time traffic can either be done by in house personnel or outsourced to professional optimizers who carry out SEO projects as a stand-alone service, like us - SEO Traffic Spider.

SEO tactics can be varied to achieve top ranking in search results. These fall into three categories (White-Hat SEO, Grey-Hat SEO, and Black-Hat SEO) depending on legitimacy and ethics.

White Hat SEO uses strategies which are considered ethically correct and legitimate by SEO’s as well as search engines while spidering a site. It would be best to use this tactic as a means of achieving top ranking in the search results for real time traffic. These tactics will not lead to penalties which are generally imposed when Black Hat SEO is used and even though it may take some amount of time to reap the rewards of this process, it will surely bring in promising results in terms of high rakings.

Grey Hat SEO uses tactics which may be considered legitimate if they are used correctly. However, these have been subjected to misuse by unethical SEO’s and webmasters. It is possible that your website will not get penalized or banned for using this strategy and it may be necessary to use this process at times, however, webmasters are careful in the use of these tactics. This is because search engines may penalize tactics that are subjected to abuse even though they are used in legitimate forms.

Black Hat SEO employs techniques that are considered illegitimate and ethically incorrect and which have been or will surely be penalized and cause your website to be banned by search engines. Since Black Hat SEO is subject to abuse widely because it tends to harm search engine user experience, it is highly recommended to avoid using it as a means of attaining high ranking.



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