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We ve covered only three of the most common web servers for use as a reverse proxy, but there are many others. One of particular note is Varnish. There are a couple of detailed articles about Varnish as part of the 2008 Catalyst advent calendar: http://www.catalystframework.org/calendar/ 2008/14 and http://www.catalystframework.org/calendar/2008/17. Squid is a proxy server that may be installed in a reverse proxy configuration. It s a fairly old proxy, but it s very powerful and widely used. For this reason, it s quite likely that you ll come across system administrators with expertise in configuration of Squid. Perlbal is a Perl-based reverse-proxy load balancer and web server. It s also powerful, and there s a reasonable amount of expertise around. Pound seems to be in roughly the same space as nginx as a lightweight open source reverse proxy, although our impression is that nginx is easier to use.

Although you can enter search queries into the <Quick Search> field displayed by default when a Concordance database is opened, Concordance provides a Search window that adds additional search features. You can open this window by clicking the Search button, by selecting the Search Search menu item, or by pressing the F2 function key. The Search window allows you to specify if the entire database should be searched, if just notes should be searched, or both. Other features include displaying a field list, displaying the contents of the dictionary file, and defining fuzzy searches. The Search window displays a history of searches, with search terms that have been used, the number of occurrences of the search terms, and the number of documents across which those search terms appear. You shouldn t confuse this summary with the query history that Concordance retains with each new search.

Before you think you ve discovered a security breach in the Oracle DBMS, I should explain that you get this informative error message only because you are testing the EMP view while connected as BOOK. If you are connected as a different database user with INSERT privilege against the EMP view only, the error message becomes as follows: ORA-01400: cannot insert NULL into ( )

At the beginning of this chapter, we showed running the built-in server, either as a stand-alone or in front of a front-end proxy. FastCGI is an alternative to this and in fact is probably the most common way to deploy a Catalyst application. It s still one of the best ways, and it even has some advantages over HTTP::Prefork particularly the ability to respawn processes by itself (HTTP::Prefork needs to be manually restarted if it stops). As we outlined in 1, FastCGI is just like a normal CGI script but wrapped in an event loop so that it s contained within a persistent process.

The CRS_OFFERINGS view (see Listing 10-10) is based on a join of two tables: OFFERINGS and COURSES. Nevertheless, you are able to perform some data manipulation via this view, as long as the data manipulation can be translated into corresponding actions against the two underlying base tables. CRS_OFFERINGS is an example of an updatable join view. The Oracle DBMS is getting closer and closer to the full implementation of Ted Codd s rule 6 (see 1). Listing 10-13 demonstrates testing some DML commands against this view. Listing 10-13. Testing DML Commands Against the CRS_OFFERINGS View SQL> delete from crs_offerings where course_code = 'ERM'; 1 row deleted. SQL> insert into crs_offerings (course_code, begindate) 2 values ('OAU' , trunc(sysdate)); 1 row created. SQL> rollback; Rollback complete. SQL> There are some rules and restrictions that apply to updatable join views. Also, the concept of keypreserved tables plays an important role in this area. As the name indicates, a key-preserved table is an underlying base table with a one-to-one row relationship with the rows in the view, via the primary key or a unique key. These are some examples of updatable join view restrictions: You are allowed to issue DML commands against updatable join views only if you change a single underlying base table. For INSERT statements, all columns into which values are inserted must belong to a key-preserved table. For UPDATE statements, all columns updated must belong to a key-preserved table. For DELETE statements, if the join results in more than one key-preserved table, the Oracle DBMS deletes from the first table named in the FROM clause. If you created the view using WITH CHECK OPTION, some additional DML restrictions apply, as explained a little later in this section.