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Field-level permissions are applied uniquely to each user This means that, each time you create a new user account, if Enable security is checked, you must take the time to determine how the user can interact with every field in the database You must apply this same care when modifying the structure of a database After creating a new field, you should immediately set permissions for that field, for all users You must reset existing field-level permissions for a field that s renamed via the File Modify menu, for each user Because of the additional overhead involved in modifying the structure of a database for which the security model is mature, you ll want to approach structural changes to a database methodically.

The next section of MakeFile.PL contains information about our application s dependencies. Our application will translate sentences into kitty pidgin with the Perl module Acme::LOLCAT, so we add the line requires 'Acme::LOLCAT' to this section of Makefile.PL. We are going to want to make our application available both as a standard web page and as a very simple web service, so we need to install a suitable view for each. The TT (Template Toolkit) view is the usual choice for rendering HTML for Catalyst applications. For the web service view, we will use a JavaScript Object Notation (JSON; a data serialization language that is similar to YAML but easier to write by hand). We might want Unicode strings to be dealt with transparently, which means that our application should have no problems accepting characters like in our input, so we will make use of Catalyst::Plugin::Unicode. The whole set of modifications to this part of the Makefile.PL file is as follows: requires requires requires requires 'Acme::LOLCAT'; 'Catalyst::View::TT'; 'Catalyst::View::JSON'; 'Catalyst::Plugin::Unicode';

If you are interested in knowing which tables are present in your database, which columns they have, whether or not those columns are indexed, which privileges are granted to you, and similar information, you should query the data dictionary Another common term for data dictionary is catalog By the way, we already queried the data dictionary implicitly before, in 2, when using the SQL*Plus DESCRIBE command; this command queries the data dictionary under the hood The data dictionary is more or less the internal housekeeping administration of Oracle The data dictionary stores information about the data, also referred to as metadata The data dictionary is automatically maintained by Oracle; therefore, the data dictionary is always up-to-date DBMSs - like Oracle - store data dictionary data in precisely the same way as they store regular data: in tables This is in compliance with Ted Codd s rule 4 (see 1).

To set permissions for a field, click the desired field, highlighting it, and then select one of the four options Full access, Read only, Write only, and No rights described in the following sections Pressing the Ctrl key on the keyboard allows for multiple selections The interface also provides a Select All button to highlight all fields Four security settings are available for each field These settings are exclusive, despite the check boxes that appear next to the respective labels (check boxes usually indicate multiple selections are possible) For example, a field cannot be both Read only and have No rights Full Access The user can both read and write to the field Note that field-level permissions affect administrative functions as well.

The big advantage of this approach is that you can use the SQL language to query data dictionary data in the same way that you query ordinary data In other words, if you master the SQL language, you need to know only the names of the data dictionary tables and the names of their columns Data dictionary access is a potential security risk That s why the Oracle DBMS offers system privileges and roles to regulate and protect access to the data dictionary For example, there is a role SELECT_CATALOG_ROLE, which contains all privileges that you need to be able to access the data dictionary data Listing 3-8 demonstrates how Oracle controls data dictionary access The listing was generated from SQL*Plus Listing 3-8 Needing the SELECT_CATALOG_ROLE Role SQL> describe dba_sys_privs ERROR: ORA-04043: object "SYS""DBA_SYS_PRIVS" does not exist SQL> connect / as sysdba Connected.