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Note that the definitions of the terms used in the preceding description vary from one DBMS product to another. The steps in Figure 17-1 vary in the amount of database access they require and the amount of CPU time they take. Parsing a SQL statement does not require access 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 with 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. However, some products such as Oracle automatically maintain a SQL cache that stores recently executed statements in memory. If the same statement is submitted to the SQL engine additional times, the parse step, and in some cases the bind step, can be skipped. Furthermore, if results of a previous identical query are still in memory, reexecution of the query may not be necessary.

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When the precompiler encounters a data structure reference in the INTO clause, it replaces the structure reference with a list of the individual variables in the structure, in the order they are declared within the structure. Thus, the number of items in the structure and their data types must correspond to the columns of query results. The use of data structures in the INTO clause is, in effect, a shortcut. It does not fundamentally change the way the INTO clause works. Support for the use of data structures as host variables varies widely among DBMS brands. It is also restricted to certain programming languages. DB2 supports C and PL/I structures but does not support COBOL or assembly language structures, for example.

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The SQL1 standard specified the SQL language used to describe a database structure, but it did not specify how databases are created, 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 creates a database as part of the Oracle software installation process, like DB2.

In contrast, the situation is quite different in programmatic SQL. 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.

Host variables provide two-way communication between the program and the DBMS. In the program shown in Figure 17-21, the host variables repnum and repname illustrate the two different roles played by host variables: I The repnum host variable is an input host variable, used to pass data from the program to the DBMS. The program assigns a value to the variable before executing the embedded statement, and that value becomes part of the SELECT statement to be executed by the DBMS. The DBMS does nothing to alter the value of the variable. I The repname host variable is an output host variable, used to pass data back from the DBMS to the program. The DBMS assigns a value to this variable as it executes the embedded SELECT statement. After the statement has been executed, the program can use the resulting value. Input and output host variables are declared the same way and are specified using the same colon notation within an embedded SQL statement. However, it s often useful to think in terms of input and output host variables when you re actually coding an embedded SQL program. Input host variables can be used in any SQL statement where a constant can appear. Output host variables are used only with the singleton SELECT statement and with the FETCH statement, described in the next section of this chapter.

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