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All application code, whether it is pure SQL code or code embedded in the form of PL/SQL program units, such as procedures and packages, is parsed first and executed later Oracle stores all compiled SQL statements in the library cache component of the shared pool The library cache component of the shared pool memory is shared by all users of the database Each time you issue a SQL statement, Oracle first checks the library cache to see if there is an already parsed and ready-to-execute form of the statement in there If there is, Oracle uses the library cache version, reducing the processing time considerably this is called a soft parse If Oracle doesn t find an execution-ready version of the SQL code in the library cache, the executable has to be built fresh this is called a hard parse.

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Oracle uses the library cache part of the shared pool memory for storing newly parsed code If there isn t enough free memory in the shared pool, Oracle will jettison older code from the shared pool to make room for your new code All hard parses involve the use of critical system resources, such as processing power and internal Oracle structures, such as latches; you must make every attempt to reduce their occurrence High hard-parse counts will lead to resource contention and a consequent slowdown of the database when responding to user requests You should make decisions about the library cache size based on hit and miss ratios on the library cache as discussed in 22 If your system is showing more than the normal amount of misses (meaning that code is being reparsed or re-executed often), it is time to increase the library cache memory.

The way to do this is to increase the total memory allocated to the shared pool..

data can be found by running a number of other programs, including uptime, w, or top. The output of these commands contains uptime data as well as load information that would have to be parsed to gather the data you want. It is fairly simple to extract the load averages from this output with awk, but obtaining load averages directly as demonstrated in our script, without determining the uptime as well, is a bit more economical in terms of system resources.

New Oracle Database 10g OCP candidates who wish to obtain the Oracle Database 10g DBA OCP credential must attend one instructor-led course either in-class or online, from the approved list of Oracle University courses.

// As I will discuss later, #pargma managed is not recommended; it is only // used to show exceptions thrown across managed / unmanaged boundaries // without using two source files #pragma unmanaged int f() { int i = 1; return (1 / --i); } #pragma managed int main() { try { f(); } catch (System::Exception^ ex) { System::Console::WriteLine(ex->GetType()->FullName); } } If you compile and execute this application, the type name System.DivideByZeroException will be written in the catch block. Most SEH exception codes will be mapped to the type System::Runtime::InteropServices::SEHException. The mapping to System.DivideByZeroException is one of the few special cases. Table 7-4 shows the SEH exceptions for which a special mapping exists. Table 7-4. Mapping SEH Exceptions to Managed Exceptions

OCM: The Oracle Database 10g OCM credential is for the Oracle database guru the senior database professional with both classroom and on-the-job experience. The prerequisites are that candidates earn an Oracle Database 10g OCP credential and complete advanced-level coursework. The final stage requires that candidates prove their skills through an intensive two-day hands-on practical examination. My views on certification are really very practical. Preparing for certification will force you to learn all the little details that you ve been ignoring for some reason or another, and it will clarify your thinking regarding many concepts. Also, the need to certify will compel you to learn some aspects of database administration that you either don t like for some reason or currently don t use in your organization. So if you re not already certified, by all means start on that path. You can get all the information you need by going to Oracle s certification Web site at http://www.oracle.com/ education/certification. Believe me, that certificate does look nice hanging in your cubicle, and it s a symbol of the vast amount of knowledge you ve acquired in the field over time. You can rightfully take pride in obtaining OCP-certified DBA status!