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Views The views catalog describes each view defined in the database, including its name, the name of its owner, the query that defines the view, and so on. Privileges The privileges catalog describes each set of privileges granted in the database, including the names of the grantor and grantee, the privileges granted, the object on which the privileges have been granted, and so on. Table 16-1 shows the names of the system tables and/or views that provide this information in each of the major SQL-based DBMS products. (Note that MySQL supports the

17:

DBMS DB21 Tables SCHEMATA TABLES REFERENCES TABOPTIONS TABDEP Oracle2 CATALOG OBJECTS TABLES SYNONYMS Informix SYSTABLES SYSREFERENCES SYSSYNONYMS Sybase SYSDATABASES SYSOBJECTS SYSKEYS SQL Server

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to the database and typically can be done very quickly. Optimization, on the other hand, is a very CPU-intensive process and requires access to the database s system catalog. For a complex, multitable query, the optimizer may explore more than a dozen different ways of carrying out the query. However, the cost in computer processing time of doing the query the wrong way is usually so high compared to the cost of doing it the right way (or at least a better way) that the time spent in optimization is more than gained back in increased query execution speed. When you type a SQL statement to interactive SQL, the DBMS goes through all five steps while you wait for its response. The DBMS has little choice in the matter it doesn t know which statement you are going to type until you type it, so none of the processing can be done ahead of time. In programmatic SQL, however, the situation is quite different. Some of the early steps can be done at compile-time, when the programmer is developing the program. This leaves only the later steps to be done at runtime, when the program is executed by a user. When you use programmatic SQL, all DBMS products try to move as much processing as possible to compile-time, because once the final version of the program is developed, it may be executed thousands of times by users in a production application. In particular, the goal is to move optimization to compile-time if at all possible.

DB2 tables have the qualifier SYSCAT (for example, SYSCAT.TABLES). Oracle provides three versions of many of its catalog views, prefixed by ALL_, DBA_, or USER_ (for example, ALL_ TABLES, DBA_TABLES, and USER_TABLES). The ALL_ version shows all objects to which the current user has access, the DBA_ version shows all objects in the entire database, and the USER_ version shows only objects owned by the current user. SQL Server catalog views have the qualifier SYS (for example, SYS.DATABASES). Starting with SQL Server 2000, system tables were deprecated in favor of newly added catalog views.

Figure 17-1.

TABLE 16-1

The central idea of embedded SQL is to blend SQL language statements directly into a program written in a host programming language, such as C, Pascal, COBOL, FORTRAN, PL/I, or Assembler Embedded SQL uses the following techniques to embed the SQL statements: I SQL statements are intermixed with statements of the host language in the source program This embedded SQL source program is submitted to a SQL precompiler, which processes the SQL statements I Variables of the host programming language can be referenced in the embedded SQL statements, allowing values calculated by the program to be used by the SQL statements I Program language variables are also used by the embedded SQL statements to receive the results of SQL queries, allowing the program to use and process the retrieved values.

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I Special program variables are used to assign NULL values to database columns and to support the retrieval of NULL values from the database I Several new SQL statements that are unique to embedded SQL are added to the interactive SQL language, to provide for row-by-row processing of query results Figure 17-2 shows a simple embedded SQL program, written in C The program illustrates many, but not all, of the embedded SQL techniques The program prompts the user for an office number, retrieves the city, region, sales, and target for the office, and displays them on the screen Don t worry if the program appears strange, or if you can t understand all of the statements that it contains before reading the rest of this chapter.

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