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The traditional means of ensuring data security (using privileges, roles, views, etc) works pretty well, but it has certain limitations Chief among these is the fact that most security measures are too broad-based, with the result that you end up unnecessarily restricting users when your primary goal is to ensure that users can freely access information they need In addition to the traditional concepts of roles and privileges, Oracle provides more fine-grained, lower-level data security techniques For example, you can allow all users to access a central table, such as a payroll table, but you can institute security policies that limit an individual user s access to only those rows in the table that pertain to his or her department Such limitations are transparent to the database users Oracle uses two related mechanisms to enforce fine-grained security within the database: an application context and a fine-grained access control policy. asp.net mvc qr code generator QR Code generation in ASP . 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Returns the PropertyInfo for the property that this index is indexing Returns the items that match the value passed to it Removes and adds back the given item from the index Returns whether the index has been established Sets the index as not loaded anymore Sets the index as loaded A security policy is attached to the table or tables to which you want to control access, and stored procedures are written to modify any relevant SQL statements made against the tables in question When a user issues an UPDATE statement against a table with such a security policy, Oracle will dynamically append a predicate (a WHERE clause) to the user s statement to modify it and limit the user s access to that table For example, if a user belonging to the sales department issues the statement UPDATE EMPLOYEE SET salary=salary*110, the security policies attached to the employee table will cause Oracle to add the fine-grained security function to the clause WHERE dept='SALES' to ensure that only employees in sales are affected Here is the original query: UPDATE EMPLOYEE SET salary=salary*110 And here is the modified statement: UPDATE EMPLOYEE SET salary=salary*1. 10 WHERE dept='SALES' To create a VPD, you have to create what is known as an application context and then implement fine-grained access control to enforce the row-level security for database tables and views The application context helps you create security policies that draw upon certain aspects of a user s session information To take a simple example, when a user logs into the database, the user s ID. asp.net generate qr code .NET QR - Code Generator for .NET, ASP . 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