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User Each database has a set of users assigned to it. Each database user maps to a login, so each user is a pseudo-account that is an alias to an SQL Server login account. User accounts do not necessarily have to have the same user name as their corresponding login accounts. When an administrator grants access to a database for a particular login account, using either a GUI tool such as Enterprise Manager or the sp_adduser stored procedure supplied with the DBMS, the user account corresponding to the login account is created by the DBMS. In Figure 8-1, the Mgr125 login corresponds to User A in the Employees database and to User D in the Products database. These privileges permit the login to connect to the database(s) but do not give the user any privileges against objects in those databases. I discuss how this happens later in this chapter. Privileges Each user account in a database may be granted any number of privileges (also called permissions). System privileges are general privileges applied at the database level. Microsoft SQL Server divides these into server privileges, which include such permissions as starting up, shutting down, and backing up the SQL Server, and statement privileges, which include such permissions as creating a database and creating a table. Object privileges allow speci c actions on a speci c object, such as allowing select and update on Table T1. Figure 8-1 contains arrows that show the granting of object privileges on Table T1 to User A in the Employees database and on Table T4 to User D in the Products database. These privileges work in much the same way across all relational databases, thanks to SQL standards, and are therefore covered in the Database Privileges section a little later in this chapter.
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Oracle s security architecture, shown in Figure 8-2, is markedly different compared to that of Microsoft SQL Server and Sybase Adaptive Server. The differences between the two are highlighted as each component is introduced: Instance This is a copy of the Oracle DBMS software running in memory. Each instance manages only one database. Database This is the collection of les managed by a single Oracle instance. Taken together, the Oracle instance and database comprise what Microsoft SQL Server and Sybase Adaptive Server call the SQL Server. Figure 8-2 depicts the Dev1 database. User Each database account is called a user. As with Microsoft SQL Server and Sybase Adaptive Server, the user account may be authenticated
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Schema Mgr125 Synonym for Employees.T1 Synonym for Products.T4
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Schema (User) Products
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Figure 8-2
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externally (that is, by the operating system) or internally (by the DBMS). Each user is automatically allocated a schema (de ned next), and this user is the owner of that schema, meaning it automatically has full privileges over any object in the schema. The following prede ned users are created automatically when the database is created (not shown in Figure 8-2): The SYS user is the owner of the Oracle instance and its schema contains objects that Oracle uses to manage the instance. This user is equivalent to the sa user in Microsoft SQL Server and Sybase Adaptive Server. The SYSTEM user is the owner of the Oracle database and its schema contains objects that Oracle uses to manage the database. This user and its corresponding schema are similar to the dbo (database owner) user in the master database in Microsoft SQL Server and Sybase Adaptive Server. Many Oracle database options create their own user accounts when those options are installed. Schema This is the collection of database objects that belong to a speci c Oracle user. The Oracle schema is equivalent to what Microsoft SQL Server
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