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In order to implement the requirements stated in the preceding section, the protection requirements have to be categorized and organized A three-dimensional access matrix which is the product of the number of accessors, the number of access types, and the number of data elements and links will be excessively large 12-6-1 Cliques The e ect of a large number of users can be reduced by establishing user categories or cliques For example, all data entry personnel may be identi ed as a member of the same clique Thus there will be a table which maps the individual user identi cation into a clique identi cation A further reduction of number of cliques required is possible if an individual can be a member of more than one clique, since fewer special categories may be needed On the other hand, unexpected privileges may be the result of multiple, concurrent clique memberships To avoid this problem, an accessor may have to state the database area to which access is desired, so that only one clique membership is active at a time A clique-identi cation number is assigned internally Once a clique member is authenticated, this number is hard to forge and will provide a better protection than user-identi cation keys It may be desirable to periodically reauthenticate the submitters of clique-identi cation numbers A monitoring process can check if the user s identi cation is appropriate for a legitimate member of the clique or would suggest that a stolen clique number exists Clique numbers which have been compromised can be withdrawn and new numbers assigned 12-6-2 Data Objects The organization of the protection objects depends greatly on the type of database control which is provided in the system For an object to be protected, it has to be accessed through a naming mechanism Objects on levels where actual addresses are used cannot be identi ed for protection If the system provides detailed descriptions of record contents and linkages (ie, a schema), quite detailed protection is possible If no facilities of this type are provided, protection generally is limited to the le level.

It is good programming practice to explicitly set the accessibility of all methods and members of your class. Although you can rely on the fact that class members are declared private by default, making their access explicit indicates a conscious decision and is self-documenting.

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discuss the referential integrity enforcement steps taken by the DBMS in terms of our Enrolled and Students tables, with the foreign key constraint that Enrolledsid is a reference to (the primary key of) Students In addition to the instance S1 of Students, consider the instance of Enrolled shown in Figure 34 Deletions of Enrolled tuples do not violate referential integrity, but insertions of Enrolled tuples could The following insertion is illegal because there is no student with sid 51111: INSERT INTO Enrolled (cid, grade, sid) VALUES ( Hindi101 , B , 51111) On the other hand, insertions of Students tuples do not violate referential integrity although deletions could Further, updates on either Enrolled or Students that change the sid value could potentially violate referential integrity SQL-92 provides several alternative ways to handle foreign key violations We must consider three basic questions: 1 What should we do if an Enrolled row is inserted, with a sid column value that does not appear in any row of the Students table In this case the INSERT command is simply rejected 2 What should we do if a Students row is deleted The options are: Delete all Enrolled rows that refer to the deleted Students row Disallow the deletion of the Students row if an Enrolled row refers to it Set the sid column to the sid of some (existing) default student, for every Enrolled row that refers to the deleted Students row For every Enrolled row that refers to it, set the sid column to null In our example, this option con icts with the fact that sid is part of the primary key of Enrolled and therefore cannot be set to null Thus, we are limited to the rst three options in our example, although this fourth option (setting the foreign key to null) is available in the general case 3 What should we do if the primary key value of a Students row is updated The options here are similar to the previous case SQL-92 allows us to choose any of the four options on DELETE and UPDATE For example, we can specify that when a Students row is deleted, all Enrolled rows that refer to it are to be deleted as well, but that when the sid column of a Students row is modi ed, this update is to be rejected if an Enrolled row refers to the modi ed Students row:.

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