rdlc data matrix

rdlc data matrix

rdlc data matrix

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rdlc data matrix

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Thus, if a view relation is computed and stored, it may become out of date if the relations used to de ne it are modi ed To avoid this, views are usually implemented as follows When we de ne a view, the database system stores the de nition of the view itself, rather than the result of evaluation of the relational-algebra expression that de nes the view Wherever a view relation appears in a query, it is replaced by the stored query expression Thus, whenever we evaluate the query, the view relation gets recomputed Certain database systems allow view relations to be stored, but they make sure that, if the actual relations used in the view de nition change, the view is kept up to date Such views are called materialized views The process of keeping the view up to date is called view maintenance, covered in Section 145 Applications that use a view frequently bene t from the use of materialized views, as do applications that demand fast response to certain view-based queries Of course, the bene ts to queries from the materialization of a view must be weighed against the storage costs and the added overhead for updates

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

lim h(t) = 4

loan)

video (You can click the folder icon to browse your system if you like)

The McGraw Hill Companies, 2001

3

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

A plot of the function is shown in Fig 14-2 The function steadily rises to a maximum, then decays with a tiny bit of oscillatory behavior and reaches the steady-state value EXAMPLE 14-3 Examine the impulse response stability for a circuit with H (s) = SOLUTION Inverting, we nd h(t) = e 2t cos 20t Clearly

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-

this will automatically start the playback on your DV camcorder Each new scene will be added to the sample menu, as shown here:

The McGraw Hill Companies, 2001

.

lim h(t) = 0