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Materialized views have two important properties, in the areas of maintenance and usage: Maintenance: Materialized views are snapshots. That is, they have a certain content at any point in time, based on refreshment from the underlying base tables. This implies that the contents of materialized views are not necessarily upto-date all the time, because the underlying base tables can change. Fortunately, the Oracle DBMS offers various features to automate the refreshment of your materialized views completely, in an efficient way. In other words, yes, you have redundancy, but you can easily set up appropriate redundancy control. Usage: The Oracle optimizer (the component of the Oracle DBMS deciding about execution plans for SQL commands) is aware of the existence of materialized views. The optimizer also knows whether materialized views are up-to-date or stale. The optimizer can use this knowledge to replace queries written against regular base tables with corresponding queries against materialized views, if the optimizer thinks that approach may result in better response times. This is referred to as the query rewrite feature, which is explained in the next section.

We set the serialized data type using the request header, but we can override this all manually by setting $c->stash->{rest} and $c->response->status Note that our class has no end action because this is taken care of by Catalyst::Controller::REST for us, and we don t have to worry about the end action that we had in the Root controller interfering with this controller The second part of our specification is where we retrieve the data for a URL that already exists in the system This time we ll make a request to our controller with one argument, which will be the URL-encoded address of the resource that we want to run through the Calais service Here are the controller methods that we want: sub record_GET { my ($self, $c, $uri) = @_; # see how $uri is automatically unescaped by Catalyst.

Options from the Setup tab control the printer selected for the print session: Name: The name of the printer that will print the images. You can use the Setup button to select a specific printer. Note that other options, such as available trays, are printer specific, so changing printers might require you to reconfigure other print options. Paper: You can specify size and source options from the drop-down boxes. Size: Selections in this drop-down box correspond to paper sizes, such as Letter and Legal. Source: Selections in this drop-down box correspond to a printer s paper feed source, such as a specific page tray, or a manual paper feed. Orientation: You can select Portrait or Landscape by enabling the corresponding radio button. Print Quality: The print quality of an image is defined by the Dots Per Inch (DPI) setting selected from this drop-down box. The default setting depends on the capabilities of the selected printer. In terms of image quality, a setting of 300 dpi is usually sufficient.

Note When you create materialized views, you normally specify whether you want to enable query rewrite, and how you want the Oracle DBMS to handle the refreshing of the materialized view. Those syntax details are used in Listing 10-21 but further usage information is omitted here. See Oracle SQL Reference for more information.

Summary

my $model = $c->model('Calais'); if (exists $model->storage->{$uri}) { $self->status_ok( $c, entity => { $uri => $model->storage->{$uri} }, ); } else { $self->status_not_found($c, {message => "$uri is not in the database"}); } }.

Let s continue with our simple materialized view, created in Listing 10-21. Assume you enter the following query, selecting all trainers from department 20: SQL> select * from employees where deptno = 20 and job = 'TRAINER' For this query, the optimizer may decide to execute the following query instead: SQL> select * from dept20_mv where job = 'TRAINER' In other words, the original query against the EMPLOYEES table is rewritten against the DEPT20_MV materialized view. Because the materialized view contains fewer rows than the EMPLOYEES table (and

therefore fewer rows need to be scanned), the optimizer thinks it is a better starting point to produce the desired end result. Listing 10-22 shows query rewrite at work, using the SQL*Plus AUTOTRACE feature. Listing 10-22. Materialized Views and Query Rewrite at Work SQL> set autotrace on explain SQL> select * from employees where deptno = 20 and job = 'TRAINER'; EMPNO -----7369 7788 7876 7902 ENAME -------SMITH SCOTT ADAMS FORD INIT ----N SCJ AA MG JOB MGR BDATE MSAL COMM DEPTNO -------- ----- ----------- ----- ----- -----TRAINER 7902 17-DEC-1965 800 20 TRAINER 7566 26-NOV-1959 3000 20 TRAINER 7788 30-DEC-1966 1100 20 TRAINER 7566 13-FEB-1959 3000 20