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SQL offers several commands to implement data security and to restrict data access. First of all, access to the database must be defined. User authorization is implemented by providing database users a login name and a password, together with some database-wide privileges. These are the most important commands in this area: CREATE USER, to define new database users ALTER USER, to change properties (privileges and passwords) of existing database users DROP USER, to remove user definitions from the database

note A byte is the length of a single ASCII character. A UTF-8 glyph, the most common encoding of nonEuropean characters, can be between 1 and 3 bytes long.

You select the appropriate delimiters, text qualifiers, and new line characters using the drop-down boxes labeled Comma, Quote, and Newline respectively. You select the date format from the Date format drop-down box. As with the corresponding check box in the Import Wizard, the Ignore first line check box causes the program to skip the first line of the delimited file. The Documents loaded and the Status fields provide feedback to the administrator during the load. The Go button performs the same function as the Browse button in the Open dialog of the Import Wizard. Once the import has been completed, you close the Import dialog by clicking the Done button.

If users are authorized to access the database, you can implement fine-grained data access by granting specific privileges. The Oracle DBMS offers two types of privileges: system privileges and object privileges. System privileges pertain to the right to perform certain (nonobject-related) actions; for example, you can have the CREATE SESSION privilege (allows you to log on to the database) and the CREATE TABLE privilege. Oracle supports approximately 140 different system privileges. Object privileges involve the right to access a specific database object in a specific way; for example, the right to issue SELECT, INSERT, and UPDATE commands against the EMPLOYEES table. Table 2-2 lists the most important Oracle object privileges.

Every web application will make use of GET requests, and almost every web application will make use of POST requests. We ll quickly mention a few other methods used to make requests to HTTP servers. OPTIONS and TRACE are used to get information from the server about what methods the server supports and information about the network, respectively (TRACE just echoes back the received request so that you can tell if it s being modified by any intermediate servers such as a proxy server). CONNECT is for setting up a secure connection under the secure HTTP protocol, HTTPS, which is beyond the scope of this short explanation. Of more relevance to Catalyst are PUT and DELETE, which are used for the implementation of REST web services. PUT is essentially the same as a POST request, but it s supposed to be used only for the creation of resources rather than POST, which is supposed to be used for the modification of resources (in practice, most of the time outside of a REST web service POST is used for both). DELETE is used to remove resources, and it obviously requires some kind of user access control. Just for giggles, let s try and DELETE the root resource at www.example.com: DELETE / HTTP/1.1 Host: www.example.com

Note Granting and revoking system privileges is typically a task for database administrators. See Oracle SQL Reference, part of the official documentation set for the Oracle Database, for more details on both system and object privileges.