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notes refer to papers that describe where negation can be used in recursive Datalog programs The view relations of a recursive program that contains a set of rules R are de ned to contain exactly the set of facts I computed by the iterative procedure DatalogFixpoint in Figure 510 The recursion in the Datalog program has been turned into an iteration in the procedure At the end of the procedure, infer(R, I) = I, and I is called a xed point of the program Consider the program de ning empl-jones, with the relation manager, as in Figure 511 The set of facts computed for the view relation empl-jones in each iteration appears in Figure 512 In each iteration, the program computes one more level of employees under Jones and adds it to the set empl-jones The procedure terminates when there is no change to the set empl-jones, which the system detects by nding I = Old I Such a termination point must be reached, since the set of managers and employees is nite On the given manager relation, the procedure Datalog-Fixpoint terminates after iteration 4, when it detects that no new facts have been inferred You should verify that, at the end of the iteration, the view relation empl-jones contains exactly those employees who work under Jones To print out the names of the employees supervised by Jones de ned by the view, you can use the query empl-jones(N ) To understand procedure Datalog-Fixpoint, we recall that a rule infers new facts from a given set of facts Iteration starts with a set of facts I set to the facts in the database These facts are all known to be true, but there may be other facts that are true as well1 Next, the set of rules R in the given Datalog program is used to infer what facts are true, given that facts in I are true The inferred facts are added to I, and the rules are used again to make further inferences This process is repeated until no new facts can be inferred For safe Datalog programs, we can show that there will be some point where no more new facts can be derived; that is, for some k, Ik+1 = Ik At this point, then, we have the nal set of true facts Further, given a Datalog program and a database, the xed-point procedure infers all the facts that can be inferred to be true.

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1 The word fact is used in a technical sense to note membership of a tuple in a relation Thus, in the Datalog sense of fact, a fact may be true (the tuple is indeed in the relation) or false (the tuple is not in the relation)

The McGraw Hill Companies, 2001

ciscoasa(config)# url-server (inside) vendor websense host 19216812 protocol tcp version 4 ciscoasa(config)# filter url 80 0 0 0 0 ciscoasa(config)# filter url 8080-8099 0 0 0 0 ciscoasa(config)# url-cache dst 128

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Conversion and transition methods provide the means to move from an old plan to a new planThe extent of the changes is a function of the degree of program change in one or more of the following plan elements:

In this example, the url-server command specifies that the server is a Websense server and that the connection is using TCP Any web traffic on port 80 or port 8080 through 8099 will be examined for filtering The appliance can cache information returned by the Websense server using 128KB of memory As you can see from this example, the setup of web filtering on the appliances is easy