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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 system table, SYSPROTECTS, shown in Table 16-12, which implements the entire privileges scheme for SQL Server. Each row in the table represents a single GRANT or REVOKE statement that has been issued.
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Implements table-level privileges by telling which users have permissions to access which tables, 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 )
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INDEXAUTH PACKAGEAUTH
Table 16-11.
DB2 System Catalog Views that Implement Permissions
16:
The System Catalog
Column Name
id uid action protecttype columns
Data Type
INT SMALLINT TINYINT TINYINT VARBINARY(32)
Information
Internal ID of protected object Internal ID of user or group with privilege Numerical privilege code Numerical code for grant or revoke Bitmap for column-level update privileges
Table 16-12.
Selected Columns of the SYSPROTECTS Table (SQL Server)
The SQL2 Information Schema
The SQL2 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 SQL2 standard defined an idealized system catalog that a DBMS vendor might design if he or she were building a DBMS to support the SQL2 standard from scratch. The tables in this idealized system catalog (called the definition schema in the standard) are summarized in Table 16-13.
DATABASE STRUCTURE
System Table
USERS SCHEMATA DATA_TYPE_DESCRIPTOR DOMAINS DOMAIN_CONSTRAINTS Table 16-13.
Contents
One row for each user ( authorization-id ) in the catalog cluster One row for each schema in the catalog cluster One row for each domain or column defined with a data type One row for each domain One row for each domain constraint
Idealized System Catalog Used by the SQL2 Standard
SQL: The Complete Reference
System Table
TABLES VIEWS COLUMNS VIEW_TABLE_USAGE
Contents
One row for each table or view One row for each table or view One row for each column in each table or view definition One row for each table referenced in each view definition (if a view is defined by a query on multiple tables, there will be a row for each table) One row for each column referenced by a view One row for each table constraint specified in a table definition One row for each column specified in each primary key, each foreign key, and each uniqueness constraint (if multiple columns are specified in a key definition or uniqueness constraint, there will be multiple rows representing that constraint) One row for each foreign key definition specified in a table definition One row for each check constraint specified in a table definition One row for each table referenced in each check constraint, domain constraint, or assertion One row for each column referenced in each check constraint, domain constraint, or assertion One row for each assertion defined One row for each privilege granted on each table One row for each privilege granted on each column One row for each character set defined One row for each collation defined One row for each translation defined One row for each language (e.g., COBOL, C, and so on) supported by this DBMS brand
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