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We now come to the first architectural feature that directly affects the way in which you should write your JDBC programs, namely that of the shared pool and the use of bind variables. An Oracle instance consists of certain memory structures that allow you to operate on a physical database. Possibly the most important memory structure associated with an instance is the shared global area (SGA), and the most important component of the SGA for a JDBC programmer is the shared pool, because the manner in which you use the shared pool via your code has an enormous bearing on the performance of your code.

The shared pool is an Oracle memory structure that consists of shared program constructs accessed and executed on your behalf by Oracle. These include stored PL/SQL procedures and packages, shared cursors, data dictionary objects, etc. When you submit a SQL statement (such as select, insert, update, delete, or merge) to Oracle, it has to parse the statement and generate an execution plan to execute it.

Note I cover the topic of SQL statement parsing in more detail in the section Overview of How Oracle

When you run this page, you only have to click the text box to see the Calendar control pop up with the result of the date selection entered into the text box as shown in Figure 7-10.

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Since the step of generating the execution plan is very CPU-intensive, Oracle stores the results of this step in the shared pool to avoid reparsing a statement if it is submitted again It follows from the previous discussion that, in general, you should strive to improve reuse of the shared code in the shared pool so that overall parsing overhead is kept to a minimum Using bind variables is an excellent way of achieving this goal A bind variable is a variable (or a parameter) in a SQL statement that is replaced (or bound) at runtime with a valid value in order for the statement to successfully execute.

The following code shows a SQL statement with and without a bind variable: -- SQL with a literal select ename from emp where empno = 7788; -- The same SQL with a bind variable in place of the literal select ename from emp where empno = ; In the former case, every time this statement is submitted with a different empno value in the where clause, it will be treated as a completely new statement and it will have to be parsed, an execution plan will have to be generated, and so on In the latter case, all subsequent executions of similar SQL statements after the first one will reuse the existing execution plan for the statement from the shared pool You can use bind variables in virtually all languages that can talk to Oracle (JDBC in Java, Pro*C, C++, and, of course, PL/SQL).

Notice the great transition from month to month when you click on the arrows of the Calendar control. Of course, you can further enhance the appearance of the control by using CSS and assigning it to the CssClass property of the Calendar control. Also, if you click on the month (on top of the control), the calendar switches to the year view (see Figure 7-11).

As you ll see, in general, the performance of a system degrades rapidly if you don t use bind variables Let s look at an example First we need to create a simple table, t1: benchmark@ORA10G> create table t1 2 ( 3 x number 4 ); Table created The following JDBC class, DemoBind, compares two approaches of inserting 10,000 records into table t1, first without using bind variables and then using bind variables..

discuss bind variables in more depth. Don t worry if you aren t able to fully understand the mechanics of this program for now the focus at this stage is to demonstrate the importance of bind variables to the performance of your JDBC programs.

CHAPTER 7 USING THE ASP.NET AJAX CONTROL TOOLKIT (PART 1)

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