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Earlier in the chapter, we discussed the idea of applying conditional security to commands to create some context-based or rules-based mechanism for database commands The commands can be used for objects on which the user has direct object privileges or for system commands, such as CREATE USER, that do not apply to a specific object or schema The notion is similar to the conditional security checks that you would perform for SARs, but this time it s applied to basic commands DBV s command rules offer another new security layer that allows the authorization of a database command such as SELECT or CREATE USER for custom-defined rules The rules may, and often do, use rules and factors The result is that you derive the same conditional security capabilities that you might otherwise get from enabling a role with SARs The decision to allow a command to execute is based on an existing privilege and a rule that must be passed An important differentiation exists between SARs and command rules With SARs, the user does not have the privileges to perform the action The privileges are granted to the role, and when the role is enabled, the user can perform the action Conditional security was performed to enable the role, thus giving the user privileges With command rules, and for DBV in general, the user must already have the base database privileges DBV acts as an additional security monitor after the basic database privileges have been verified These privileges can be obtained in one of three ways: They may be logged into the schema that owns the objects We call this the object owner model They may have direct object grants to the object For example, for a user logged into the SR_ADMIN schema, an appropriate grant can be made to allow the user to access the PRODUCTS table in the SH schema by having the user SH issue a GRANT SELECT ON PRODUCTS to SR_ADMIN, which is a specific object-level privilege They may be able to perform an action based on a system or system ANY privileges.

To copy a worksheet to a new workbook, use a copy worksheet command with the worksheet name but without either the before parameter or the after parameter For example, the following statement copies the worksheet named Materials from the active workbook to a new workbook:

We would like to partition the data points into groups that are compact in the sense of having small diameter k- CLUSTER Output: A partition of the points into k clusters C 1 , , Ck Goal: Minimize the diameter of the clusters, max max d(xa , xb )

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With command rules, the user must already have the privilege Command rules pertain to commands that do not need to have relevance to any DBV realms and as such can overrule a command that is allowed by a realm s policy This makes sense when you consider the many system commands that are irrelevant to any data object (such as CREATE USER) This makes DBV transparent and allows it to work for existing applications If the existing application security model prevented a user from performing an action, DBV does not and cannot undo the existing security NOTE DBV adds a layer of security that is called at runtime to mediate actions and access Access = DB privilege + DBV rule

tell the active workbook to copy worksheet sheet "Materials"

One way to visualize this task is to imagine n points in space, which are to be covered by k spheres of equal size What is the smallest possible diameter of the spheres Figure 95 shows an example This problem is NP-hard, but has a very simple approximation algorithm The idea is to pick k of the data points as cluster centers and to then assign each of the remaining points to the center closest to it, thus creating k clusters The centers are picked one at a time, using an intuitive rule: always pick the next center to be as far as possible from the centers chosen so far (see Figure 96) Pick any point 1 X as the first cluster center for i = 2 to k: Let i be the point in X that is farthest from 1 , , i 1 (ie, that maximizes minj<i d( , j )) Create k clusters: Ci = {all x X whose closest center is i } 273

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This gives you a new workbook that s the active workbook You can then either work with it directly as the active workbook (for example, you ll probably want to save it) or assign it to a variable so that you can keep track of it

Figure 96 (a) Four centers chosen by farthest- rst traversal (b) The resulting clusters (a)

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