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Prior to implementing support for roles, several DBMS brands, including Sybase and SQL Server, offered a third alternative for dealing with groups of similar users. They support group-ids, which identify groups of related user-ids. Privileges can be granted both to individual user-ids and to group-ids, and a user may carry out a database action if it is permitted by either the user-id or group-id privileges. Group-ids thus simplify the administration of privileges given to groups of users. However, they are nonstandard, and a database design using them may not be portable to another DBMS brand. Some versions of DB2 also support groups of users but take a different approach. The DB2 database administrator can configure DB2 so that when you first connect to DB2 and supply your user-id (known as your primary authorization-id), DB2 automatically looks up a set of additional user-ids (known as secondary authorization-ids) that you may use. When DB2 later checks your privileges, it checks the privileges for all of your authorization-ids, primary and secondary. On an IBM mainframe system, the DB2 database administrator normally sets up the secondary authorization-ids so that they are the same as the user group names used by Resource Access Control Facility (RACF), the IBM mainframe security facility. Thus, the DB2 approach effectively provides group-ids, but does so without adding to the user-id mechanism.
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SQL security protections apply to specific objects contained in a database. The SQL1 standard specified two types of security objects tables and views. Thus, each table and view can be individually protected. Access to a table or view can be permitted for certain user-ids and prohibited for other user-ids. Subsequent versions of the SQL standard expand security protections to include other objects, including domains and user-defined character sets, and add a new type of protection for table or view access. Most commercial SQL products support additional types of objects that are subject to security controls. In a SQL Server database, for example, a stored procedure is an important database object. The SQL security scheme determines which users can create and drop stored procedures and which users are allowed to execute them. In IBM s DB2, the physical tablespaces where tables are stored are treated as security objects. The database administrator can give some user-ids permission to create new tables in a particular tablespace and deny that permission to other user-ids. Other SQL implementations support other security objects. However, the underlying SQL security scheme of specific privileges applied to specific objects, granted or revoked through the same SQL statements is almost universally applied.
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The set of actions that a user can carry out against a database object are called the privileges for the object. The SQL1 standard specifies four basic privileges for tables and views: The SELECT privilege allows you to retrieve data from a table or view. With this privilege, you can specify the table or view in the FROM clause of a SELECT statement or subquery. The INSERT privilege allows you to insert new rows into a table or view. With this privilege, you can specify the table or view in the INTO clause of an INSERT statement.
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The DELETE privilege allows you to delete rows of data from a table or view. With this privilege, you can specify the table or view in the FROM clause of a DELETE statement. The UPDATE privilege allows you to modify rows of data in a table or view. With this privilege, you can specify the table or view as the target table in an UPDATE statement. The UPDATE privilege can be restricted to specific columns of the table or view, allowing updates to these columns but disallowing updates to any other columns. These four privileges are supported by virtually all commercial SQL products.
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