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With this approach the client and server keep the HTTP connection open persistently, rather than closing and reopening it after every message. The result is instant message delivery to all connected clients, but there are some significant limitations. All the AMF channel types used for messaging send and receive data between client and server as simple HTTP requests from the client. In the background, the server s servlet API uses blocking I/O, also known as synchronous input/output, so with long polling and streaming you have to explicitly manage the number of concurrent connections to avoid overwhelming the server s available threads. For example, when using an AMF streaming channel, each browser session can have only a single concurrent connection. (You can change this in the channel configuration.) If you try to test a messaging application with multiple browser windows from a single browser application (for example, Firefox) on the same system, only the first copy of the application will successfully connect to the server. Application instances in additional browser windows will fail to connect because the maximum number of connections per browser session has been exceeded. You can solve this during testing by using multiple browser products (for example, both Internet Explorer and Firefox) or multiple computer systems.



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be further restricted to exclude certain columns These columns receive NULL values when a user without access privileges modifies the table Users may also have privileges to execute Data Definition Language (DDL) operations that enable users to alter table properties, create triggers, create indexes, or create references where the table is used as the parent key to any foreign keys that the user creates in his or her own tables This dependency restricts our ability to modify the parent key column in the original table to maintain references to foreign keys in other tables Oracle roles allow applications to implement RBAC, which enables simplified security administration by separating the direct mapping from users to privileges through intermediate roles Users are assigned to roles based on their job function, and roles are assigned database privileges based on the access operations needed to fulfill that function.





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defined in a domain . Here, LDE is the differential operator, is the unknown quantity, and f is the excitation or forcing function. For a complete definition, the boundary conditions on the boundary enclosing must also be defined. When solving this problem with FEM, there are four basic steps involved (see the references for a more detailed description). First, the domain must be subdivided or discretized into a finite number of subregions (or elements). With a sufficiently fine subdivision, very complex geometries (and materials) can be analyzed. The discretization will affect the computer storage requirements, the computation time, and the accuracy of the solution. Second, the solution within each element is approximated by a suitable function; often a first-order polynomial is used. In the third step, all elemental equations are brought together and the boundary conditions are imposed to get the final system of equations. If a proper discretization was made, the FEM formulation results in a banded matrix formulation. Finally, this system of equations can be solved in different ways, preferably by using a method that takes advantage of the banded matrix.

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Roles can be dynamically enabled or disabled to limit user privileges in a controlled manner Roles can be password-protected A user must know the password to enable (that is, assume) the role A role can be granted system or object privileges Once created, a role can be granted to other roles (under some consistency constraints) If role R1 is explicitly granted to role R2, any user who explicitly enables R2 implicitly and automatically gains all the privileges owned by R1 Users with the GRANT privilege can assign or remove roles using the GRANT and REVOKE statements As an Oracle specific detail, roles do not belong to a particular schema Oracle does not support true role hierarchies in terms of the partial order and inheritance properties of the hierarchical RBAC model described in [SFK00].

TABLE 9-1

The ability to grant roles to roles, however, is quite powerful in creating set-theoretic models within the application to create hierarchical properties Oracle defines the security domain for a user or role as the collection of all the privileges enabled through direct grants, schema membership, or explicit and implicit role grants Dependencies between two or more privileges granted implicitly through roles can cause unexpected results if we can combine them Security domains may enable self-promotion if we permit privileges to be arbitrarily combined to create new access rights Oracle forbids the execution of some DDL statements if received through a role; for example, a user with the CREATE VIEW privilege cannot create a view on a table on which he or she has the SELECT privilege, if that privilege is not directly granted but is acquired through a role grant.

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