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implementation of popular SQL products by requiring that DDL statements be executed interactively and by a program. The SQL standard specifies only the parts of the DDL that are relatively independent of physical storage structures, operating system dependencies, and other DBMS brand-specific capabilities. In practice, all DBMS brands include significant extensions to the standard DDL to deal with these issues and other enhanced database capabilities. The differences between the ANSI/ISO standard and the DDL as implemented in popular SQL products are described for each SQL statement through the remainder of this chapter.
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In a large mainframe or enterprise-level network DBMS installation, the corporate database administrator is solely responsible for creating new databases. On smaller workgroup DBMS installations, individual users may be allowed to create their own personal databases, but it s much more common for databases to be created centrally and then accessed by individual users. If you are using a personal computer DBMS, you are probably both the database administrator and the user, and you will have to create the database(s) that you use personally. The SQL1 standard specified the SQL language used to describe a database structure, but it did not specify how to create databases, because each DBMS brand had taken a slightly different approach. Those differences persist in present-day mainstream DBMS products. The techniques used by these SQL products illustrate the differences: IBM s DB2 has a simple default database structure. A DB2 database is associated with a running copy of the DB2 server software, and users access the database by connecting to the DB2 server. A DB2 database is thus effectively defined by an installation of the DB2 software on a particular computer system. Oracle, by default, can create a database as part of the Oracle software installation process, like DB2 does. However, rarely does an Oracle administrator allow the installer to create the database, opting instead to use Oracle s CREATE DATABASE command, or a GUI tool supplied by Oracle, to create the database with parameter settings customized for the expected use of the database. For the most part, each copy of the Oracle DBMS software manages a single database, which is named in an Oracle configuration file; user tables are placed within schemas in that database. Note that multiple Oracle databases can be managed on a given server or mainframe, but in those arrangements, each has its own copy of the DBMS software running on that computer system. Microsoft SQL Server and Sybase include a CREATE DATABASE statement as part of their Data Definition Language. A companion DROP DATABASE statement destroys previously created databases. These statements can be used with interactive or programmatic SQL. The names of these databases are tracked in a special master database that is associated with a single installation of SQL Server. While the architecture is different from DB2 and Oracle, a Sybase or SQL Server database is similar in concept to an Oracle or DB2 schema. Database names must be unique within this SQL Server installation. Options to the CREATE DATABASE statement specify the physical I/O device on which the database is to be located.
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Informix Universal Server (now an IBM product) supports CREATE DATABASE and DROP DATABASE SQL statements as well. An option in the CREATE DATABASE statement allows the database to be created in a specific dbspace, which is a named area of disk storage controlled by the Informix software. Another option controls the type of database logging to be performed for the new database, with trade-offs between performance and data integrity during system failures. MySQL also supports CREATE DATABASE and DROP DATABASE SQL statements. Options in the CREATE DATABASE control storage parameters and the choice of database engines used to manage the database. Each database is placed in its own directory under the root directory for the MySQL installation. The SQL standard specifically avoids a specification of the term database, because it is overloaded with contradictory meanings from DBMS products. The standard uses the term catalog to describe a named collection of tables that is called a database by most popular DBMS brands. (Additional information about the database structure specified by the SQL standard is provided later in the section Database Structure and the ANSI/ISO Standard. ) The standard does not specify how a catalog is created or destroyed, and specifically says that creation or destruction is implementation-dependent. It also indicates how many catalogs there are, and whether individual SQL statements that can access data from different catalogs are implementation-defined. In practice, as shown by the preceding examples, many of the major DBMS vendors have moved toward the use of a CREATE DATABASE/DROP DATABASE statement pair.
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