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Oracle doesn t give anything but minimal and casual advice regarding the appropriate settings of key resources, such as total memory allocation or the sizes of the components of memory. Oracle has some general guidelines about the correct settings for several key initialization parameters that have a bearing on performance. However, beyond specifying wide ranges for the parameters, the company s guidelines aren t helpful to DBAs deciding on the optimal levels for these parameters.

Context A process P1 wishes to send a message to a process P2. The message may be a command or a request for information. While the message is being processed, P1 does not need to obtain progress feedback from P2. Forces When the execution time of a command is expected to be short, there may be little justification for progress feedback. Even if the execution time is long, it may not be feasible for P2 to report partial completion feedback results, because it might be too complicated to do, unwarranted, impractical, or even impossible.

Oracle says this is because all these parameters are heavily application dependent All of this means that you as a DBA have to find out the optimal sizes of resource allocations and the ideal settings of key initialization parameters through trial and error As a DBA, you re often called in to tune the instance when users perceive slow response caused by a bottleneck somewhere in the system This bottleneck can be the result of either an excessive use of or insufficient provision of some resource In addition, database locks and latches may cause a slowdown You have to remember, though, that in most cases, the solution isn t simply to increase the resource that seems to be getting hit hard that may be the symptom, not the cause of a problem If you address the performance slowdown by fixing the symptoms, the root causes will remain potential troublemakers.

Performance tuning an Oracle database instance involves tuning memory and I/O as well as operating system resources such as CPU, the operating system kernel, and the operating system memory allocation When you receive calls from the help desk or other users of the system complaining that the system is running slowly, you can only change what s under your direct control mainly, the allocation of memory and its components and some dynamic initialization parameters that have a bearing on instance performance Depending on what the various indicators tell you, you may adjust the shared pool and other components of memory to improve performance You can also change the operating system priority of some processes, or quickly add some disk drives to your system One of the main reasons for a slow response time in a production system is due to user processes waiting for a resource.

Blind interactions apply to both push and pull interactions. Let P1 be the talker or interrogator, and let P2 be the listener or respondent. An interaction is called blind when P1 can t obtain status updates from P2 while P2 is busy processing the command or request. P1 basically issues a command and waits for P2 to execute it. While execution is underway, P1 might go off and do other things. What s important about blind interactions is that P1 can t ask P2 how long the command will take to complete or how far along P2 is in the execution of a command. Both synchronous and asynchronous interactions can be blind.

Oracle provides several ways of monitoring waits, but you need to understand their significance in your system Long wait times aren t the problem themselves; they re symptoms of deep-seated problems The DBA should be able to connect different types of waits with possible causes in the application or in the instance Although some manuals tell you that you should do performance tuning before application tuning before you proceed to tuning areas such as memory, I/O, and contention real life isn t so orderly Most of the time, you don t have the opportunity to have the code revised, even if there are indications that it isn t optimal Instead of being an orderly process, tuning databases is an iterative process, where you may have to go back and forth between stages.