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Last, but not least, views are a powerful means to implement data security. Views allow you to hide certain data from database users and applications. The view query precisely determines which rows and columns are exposed via the view. By using the GRANT and REVOKE commands on your views, you specify in detail which actions against the view data are allowed. In this approach, you don t grant any privileges at all on the underlying base tables, since you obviously don t want database users or applications to bypass the views and access the base tables directly.

As you ve learned in this chapter, views are virtual tables, and they are supposed to behave like tables as much as possible. For retrieval, that s no problem. However, data manipulation via views is not always possible. A view is theoretically updatable if the DML command against the view can be unambiguously decomposed into corresponding DML commands against rows and columns of the underlying base tables. Let s consider the three views created in Listings 10-10 and 10-11. Listing 10-10. CRS_OFFERINGS View, Based on a Join SQL> create or replace view crs_offerings as 2 select o.course as course_code, c.description, o.begindate 3 from offerings o 4 join 5 courses c 6 on (o.course = c.code); View created. SQL> Listing 10-11. Simple EMP View and Aggregate AVG_EVALUATIONS View SQL> create or replace view emp as 2 select empno, ename, init 3 from employees; View created. SQL> create or replace view avg_evaluations as 2 select course 3 , avg(evaluation) as avg_eval

The Search window, opened by clicking the Search button, is another way to search database records (see Figure 9-15). It allows you to enter search terms; to view result statistics; and to gain quick access to field names, Concordance s dictionary file, and Concordance s Fuzzy feature (a way to locate similar words).

Now you have static content served by nginx and the web application served by a backend server running on localhost. Note the slightly odd syntax for specifying serving static files, in that the static directory in the root directive is missing in the /static location block for serving the static files. Load balancing with nginx is slightly different from lighttpd, having more in common with the Apache way of doing things. First, you define a cluster of servers: upstream my_cluster { server 127.0.0.1:3000; server 192.168.1.100:3000; } Then you point the proxy_pass definition at the cluster: location / { proxy_set_header Host $http_host; proxy_set_header X-Forwarded-Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_pass http://my_cluster; } Note that you can specify an optional weight to each node in the cluster so as to specify the number of requests that each back-end server gets.

registrations by course;

Figure 9-15. The user has entered New York as a search phrase in the Search window. The number of hits (occurrences) and number of documents containing those hits for each word of the search phrase is displayed.

View created. SQL> First, let s look at the most simple view: the EMP view. The Oracle DBMS should be able to delete rows from the EMPLOYEES table via this view, or to change any of the three column values exposed by the view. However, inserting new rows via this view is impossible, because the EMPLOYEES table has NOT NULL columns without a default value (such as the date of birth) outside the scope of the EMP view. See Listing 10-12 for some DML experiments against the EMP view. Listing 10-12. Testing DML Commands Against the EMP View SQL> delete from emp 2 where empno = 7654; 1 row deleted. SQL> update emp 2 set ename = 'BLACK' 3 where empno = 7698; 1 row updated. SQL> insert into emp 2 values (7999,'NEWGUY','NN'); insert into e * ERROR at line 1: ORA-01400: cannot insert NULL into ("BOOK"."EMPLOYEES"."BDATE") SQL> rollback; Rollback complete. SQL> Note that the ORA-01400 error message in Listing 10-12 actually reveals several facts about the underlying (and supposedly hidden) table: The schema name (BOOK) The table name (EMPLOYEES) The presence of a mandatory BDATE column