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The SQL2 standard significantly extended the SQL1 notion of database definition and database schemas. As previously noted, the SQL2 standard requires that data definition statements be executable by an interactive SQL user or by a SQL program. With this capability, changes to the database structure can be made at any time, not just when the database is created. In addition, the SQL1 concepts of schemas and users (officially called authorization-ids in the standard) is significantly expanded. Figure 13-13 shows the high-level database structure specified by the SQL2 standard. The highest-level database structure described by the SQL2 standard is the SQLenvironment. This is a conceptual collection of the database entities associated with a

13:

GRANT privilege [,privilege ...] [ON object] TO grantee [,grantee ...] [WITH GRANT OPTION | WITH ADMIN OPTION];

Figure 13-13.

DBMS implementation that conforms to the SQL2 standard. The standard doesn t specify how a SQL-environment is created; that depends on the particular DBMS implementation. The standard defines these components of a SQL-environment: I DBMS software that conforms to the SQL2 standard. I Named users (called authorization-ids in the standard) who have the privileges to perform specific actions on the data and structures within the database. I Program modules that are used to access the database. The SQL2 standard specifies the actual execution of SQL statements in terms of a module language, which in practice is not used by most major commercial SQL products. No matter how the SQL programs are actually created, however, the standard says that, conceptually, the SQL-environment includes the program s database access code. I Catalogs that describe the structure of the database. SQL1-style database schemas are contained within these catalogs. I Database data, which is managed by the DBMS software, accessed by the users through the programs, and whose structure is described in the catalogs. Although the standard conceptually describes the data as outside of the catalog structure, it s common to think of data as being contained in a table that is in a schema, which is in a catalog.

Within a SQL-environment, the database structure is defined by one or more named catalogs. The word catalog in this case is used in the same way that it has historically been used on mainframe systems to describe a collection of objects (usually files). On minicomputer and personal computer systems, the concept is roughly analogous to a directory. In the case of a SQL2 database, the catalog is a collection of named database schemas. The catalog also contains a set of system tables (confusingly, often called the system catalog) that describe the structure of the database. The catalog is thus a selfdescribing entity within the database. This characteristic of SQL2 catalogs (which is provided by all major SQL products) is described in detail in 16. The SQL2 standard describes the role of the catalog and specifies that a SQLenvironment may contain one or more (actually zero or more) catalogs, each of which must have a distinct name. It explicitly says that the mechanism for creating and destroying catalogs is implementation-defined. The standard also says that the extent to which a DBMS allows access across catalogs is implementation defined. Specifically, whether a single SQL statement can access data from multiple catalogs, whether a single SQL transaction can span multiple catalogs, or even whether a single user session with the DBMS can cross catalog boundaries are all implementation-defined characteristics. The standard says that when a user or program first establishes contact with a SQL-environment, one of its catalogs is identified as the default catalog for the session. (Again, the way in which this catalog is selected is implementation-defined.) During the course of a session, the default catalog can be changed with the SET CATALOG statement.

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The SQL2 schema is the key high-level container for objects in a SQL2 database structure. A schema is a named entity within the database and includes the definitions for the following: I Tables. Along with their associated structures (columns, primary and foreign keys, table constraints, and so on), tables remain the basic building blocks of a database in a SQL2 schema. I Views. These are virtual tables, derived from the actual tables defined in the schema, as described in 14. I Domains. Function like extended data types for defining columns within the tables of the schema, as described in 11. I Assertions. These database integrity constraints restrict the data relationships across tables within the schema, as described earlier in the section Assertions. I Privileges. Database privileges control the capabilities that are given to various users to access and update data in the database and to modify the database structure. The SQL security scheme created by these privileges is described in 14.