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If the RELOADS column of the V$LIBRARYCACHE view shows large values, it means that many SQL statements are being reloaded into the library pool after they ve been aged out. You might want to increase your shared pool, but this still may not do the trick if the application is large, the number of executions is large, or the application doesn t use bind variables. If the SQL statements aren t exactly identical and/or if they use constants instead of bind variables, more hard parses will be performed, and hard parses are inherently expensive in terms of resource usage. You can force the executable SQL statements to remain in the library cache component of the shared pool by using the Oracle-provided DBMS_SHARED_POOL package. The package has the KEEP and UNKEEP procedures; using these you can retain and release objects in the shared pool. You can use the V$LIBRARY_CACHE_MEMORY view to determine the number of library cache memory objects currently in use in the shared pool and to determine the number of freeable library cache memory objects in the shared pool. The V$SHARED_POOL_ADVICE view provides you with information about the parse time savings you can expect for various sizes of the shared pool. asp.net code 128 barcode VB6 - Code128 A,B and C-VBForums
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truetype tot.net code 128 http://microsoft.com/downloads/windows-internet- explorer-7-for-windows-xp-sp2 in .NET framework. Make Code 128 Code Set C in . The key idea behind optimizing the use of the library cache is to reuse previously parsed or executed code. One of the easiest ways to do this is to use bind variables rather than literal statements in the SQL code. Bind variables are like placeholders: they allow binding of application data to the SQL statement. Using bind variables enables Oracle to reuse statements when the only things changing in the statements are the values of the input variables. Bind variables enable you to reuse the cached, parsed versions of queries and thus speed up your application. Here s an example of the use of bind variables. The following code sets up a bind variable as a number type: SQL> VARIABLE bindvar NUMBER; SQL> BEGIN 2 :bindvar :=7900; 3 END; 4 / PL/SQL procedure successfully completed. SQL> This technique, which is a very common way to obtain completion feedback for asynchronous blind commands, is shown in Figure 9-7. vb net code 128 checksum Response ( Error ) Codes - Authorize . net Developer
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Code 128 VB . NET Barcode Generator Control / Library is a mature barcode generating library, which can be easily integrated into VB . NET class project. You can now issue the following SQL statement that makes use of the bind variable you just created: SQL> SELECT ename FROM scottemp WHERE empid = :bindvar; ENAME JAMES You can execute this statement multiple times with different values for the bind variable The statement is parsed only once and executes many times Unlike when you use a literal value for the emp_id column (7499, for example), Oracle reuses the execution plan it created the first time, instead of creating a separate execution plan for each such statement This cuts hard parsing (and high latch activity) and the attendant CPU usage drastically, and dramatically reduces the time taken to retrieve data For example, all the following statements can use the parsed version of the query that uses the bind variable: SELECT ename FROM scottemp WHERE empid = 7499; SELECT ename FROM scott. emp WHERE empid = 7788; SELECT ename FROM scottemp WHERE empid = 7902; Unfortunately, in too many applications, literal values rather than bind values are used You can alleviate this problem to some extent by setting up the following initialization parameter: CURSOR_SHARING=FORCE Or you could use the following parameter: CURSOR_SHARING=SIMILAR By default, the CURSOR_SHARING initialization parameter is set to EXACT, meaning that only statements that are identical in all respects will be shared among different executions of the statement Either of the alternative values for the CURSOR_SHARING parameter, FORCE or SIMILAR, ensures Oracle will reuse statements even if they aren t identical in all respects For example, if two statements are identical in all respects and differ only in literal values for some variables, using CURSOR SHARING=FORCE will enable Oracle to reuse the parsed SQL statements in its library cache. vb net code 128 checksum Code 128 Barcode Generator for ASP . NET Application - TarCode.com
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