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SELECT USERNAME FROM DBA_USERS;
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The DB2 system catalog table that contains user names also contains the information about their roles and privileges within the database (that is, whether they are a database administrator, whether they can create tables, whether they can create programs that access
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The System Catalog
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the database). Here is the equivalent query to the preceding queries for retrieving user names from the DB2 catalog: List all the user-ids known to DB2.
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SELECT DISTINCT GRANTEE FROM SYSCAT.DBAUTH WHERE GRANTEETYPE = 'U';
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In addition to storing database structure information, the system catalog generally stores the information required by the DBMS to enforce database security. As described in 15, various DBMS products offer different variations on the basic SQL privileges scheme. These variations are reflected in the structure of the system catalogs for the various DBMS brands. DB2 has one of the most comprehensive schemes for user privileges, extending down to the individual columns of a table. Table 16-11 shows the DB2 system catalogs that store information about privileges and briefly describes the role of each one. The authorization scheme used by SQL Server is more fundamental and streamlined than that of DB2. It treats databases, tables, stored procedures, triggers, and other entities uniformly as objects to which privileges apply. This streamlined structure is reflected in the catalog view, SYS.DATABASE_PERMISSIONS, shown in Table 16-12, which implements the entire privileges scheme for a SQL Server database. Each row in the table represents a single GRANT or REVOKE statement that has been issued.
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System Table TABAUTH
Role Implements table-level privileges by telling which users have permissions to access which tables and for which operations (SELECT, INSERT, DELETE, UPDATE, ALTER, and INDEX) Implements column-level privileges by telling which users have permission to update or to reference which columns of which tables Determines which users have permission to connect to the database, to create tables, and to perform various database administration functions Implements schema-level privileges by telling which users have permission to create, drop, or alter objects (tables, views, domains, and so on) within a schema Implements index-level privileges by telling which users have control privileges over various indexes Implements programmatic access privileges by telling which users have the ability to control, bind (create), and execute various database access programs ( packages )
COLAUTH DBAUTH SCHEMAAUTH INDEXAUTH PACKAGEAUTH
TABLE 16-11
DB2 System Catalog Views that Implement Permissions
Part IV:
Database Structure
Column Name class
Data Type tinyint
Information Class on which permission exists O = Database 1 = Object or column 3 = Schema 4 = Database principal 5 = Assembly 6 = Type 10 = XML schema collection 15 = Message type 16 = Service contract 17 = Service 18 = Remote service binding 19 = Route 23 = Full-text catalog 24 = Symmetric key 25 = Certificate 26 = Asymmetric key Description of class on which permission exists ID of thing on which permission exists Secondary ID of thing on which permission exists Database principal ID to which the permission is granted Database principal ID of the grantor of the permission Database permission type Name of the permission State of the permission Description of permission state
class_desc major_id minor_id grantee_ principal_id grantor_ principal_id type permission_name state state_desc
TABLE 16-12
nvarchar(60) int int int int char(4) sysname char(1) nvarchar(60)
Columns of the SYS.DATABASE_PERMISSIONS Table (SQL Server)
The SQL Information Schema
The SQL standard does not directly specify the structure of a system catalog that must be supported by DBMS implementations. In practice, given the widely differing features supported by different DBMS brands and the major differences in the system catalogs that were already being used by commercial SQL products when the SQL2 standard was adopted, it would have been impossible to reach an agreement on a standard catalog definition. Instead, the writers of the SQL standard defined an idealized system catalog that a DBMS vendor might design if it were building a DBMS to support the SQL standard from scratch. Since MySQL was developed after the SQL Information Schema was added to the SQL standard, it was built to conform to the standard. Microsoft added a number of views compliant with the SQL Information Schema to SQL Server 2008. More vendors are likely to follow.
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