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Description Specifies the number of To: fields to match on Specifies the number of invalid e-mail recipients (nonexistent e-mail addresses) to match on Specifies the encoding scheme to match on for attached files (7bit, 8bit, base64, binary, others, quoted-printable) Specifies the number of bytes to match on for an attached file Specifies a regular expression to use to match on an attached filename or extension Specifies the length of an e-mail sender s address to match on Specifies a regular expression or regular expression class map to use to match on an e-mail sender s address

180 160 140 Total Compensation 120 ($000) 100 80 60 17%

Although views are a useful tool for queries, they present serious problems if we express updates, insertions, or deletions with them The dif culty is that a modi cation to the database expressed in terms of a view must be translated to a modi cation to the actual relations in the logical model of the database To illustrate the problem, consider a clerk who needs to see all loan data in the loan relation, except loan-amount Let loan-branch be the view given to the clerk We de ne this view as create view loan-branch as loan-number , branch-name (loan) Since we allow a view name to appear wherever a relation name is allowed, the clerk can write: loan-branch loan-branch {(L-37, Perryridge )} This insertion must be represented by an insertion into the relation loan, since loan is the actual relation from which the database system constructs the view loan-branch However, to insert a tuple into loan, we must have some value for amount There are two reasonable approaches to dealing with this insertion: Reject the insertion, and return an error message to the user Insert a tuple (L-37, Perryridge , null) into the loan relation Another problem with modi cation of the database through views occurs with a view such as create view loan-info as customer -name, amount (borrower

match [not] mime filename length match [not] mime filetype regex match sender-address length gt match [not] sender-address regex

loan)

The McGraw Hill Companies, 2001

Table 12-1 E-mail Policy Parameters for the match Command (Continued)

3

inspect esmtp command in a layer 3/4 policy map:

This view lists the loan amount for each loan that any customer of the bank has Consider the following insertion through this view: loan-info loan-info {( Johnson , 1900)} The only possible method of inserting tuples into the borrower and loan relations is to insert ( Johnson , null) into borrower and (null, null, 1900) into loan Then, we obtain the relations shown in Figure 336 However, this update does not have the desired effect, since the view relation loan-info still does not include the tuple ( Johnson , 1900) Thus, there is no way to update the relations borrower and loan by using nulls to get the desired update on loan-info Because of problems such as these, modi cations are generally not permitted on view relations, except in limited cases Different database systems specify different conditions under which they permit updates on view relations; see the database system manuals for details The general problem of database modi cation through views has been the subject of substantial research, and the bibliographic notes provide pointers to some of this research

ciscoasa(config)# policy-map L3/4_policy_map_name ciscoasa(config-pmap)# class L3/4_class_map_name ciscoasa(config-pmap-c)# inspect esmtp [L7_policy_map_name]

Examine the relationship between pay and performance using a variety of dispersion charts to review trends and pay and performance relationships Prepare unique charts for each job Be careful to eliminate data of personnel who only worked part of the year Using the dispersion charts, determine what the program really rewards versus what it purports to reward

In Section 351 we mentioned that view relations may appear in any place that a relation name may appear, except for restrictions on the use of views in update ex-

Let s look at an example to illustrate how to use layer 7 policy maps with e-mail inspection I ll use the following example:

The McGraw Hill Companies, 2001

ciscoasa(config)# regex BAD_SENDER1 @abc\com ciscoasa(config)# class-map type regex match-any BAD_SENDERS ciscoasa(config-cmap)# match regex BAD_SENDER1 ciscoasa(config)# policy-map type inspect esmtp L7_EMAIL_MAP

.