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n the previous chapter, you learned how to write efficient SQL to maximize an application s performance The use of optimal SQL and efficient design of the layout of the database objects are parts of a planned or proactive tuning effort This chapter focuses on the efficient use of the resources Oracle works with: memory, CPU, and storage disks The chapter discusses how to monitor and optimize memory allocation for the Oracle instance In this context, you ll learn about the traditional database hit ratios, such as the buffer cache hit ratios However, focusing on the hit ratios isn t necessarily the smartest way to maintain efficient Oracle databases because you need to focus on the user s response time Investigating factors that are causing processes to spend excessive time waiting for resources is a better approach to performance tuning.

The procedure do_or_insert inserts a given number of parent records and a given number of children for each parent record into the object view components_or_view: 54 55 56 57 58 59 60 61 62 63 64 65 66 67 procedure do_or_insert ( p_num_of_parents in int := 50, p_num_of_children in int := 500 ) as l_part_type_tab part_type_tab; l_part_type part_type; l_part_or_id number := 1; begin l_part_type_tab := part_type_tab(); l_part_type_tab.extend( p_num_of_children ); for i in 1..p_num_of_parents loop for j in 1..p_num_of_children loop

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This chapter provides you with a solid introduction to Oracle wait events and tells you how to interpret them and reduce the incidence of these wait events in your system A fairly common problem in many production systems is that of a database hang, when things seem to come to a standstill for some reason This chapter shows you what to do during such events The chapter explains the key dynamic performance tables that you need to be familiar with to understand instance performance issues Although you ve encountered the Automatic Database Diagnostic Monitor (ADDM) and Automatic Workload Repository (AWR) in earlier chapters, this chapter reviews their role in instance tuning You can also use the Active Session History (ASH) feature to understand recent session history Analyzing ASH information helps solve numerous performance issues in a running instance.

Although it s nice to be able to design a system proactively for high performance, more often than not, the DBA has to deal with reactive tuning when performance is unsatisfactory and a fix needs to be found right away The final part of this chapter deals with a simple methodology to follow when your system performance deteriorates and you need to fine-tune the Oracle instance I begin this chapter with a short introduction to instance tuning and then turn to cover in detail the tuning of crucial resources such as memory, disk, and CPU usage Later on in the chapter, I review the important Oracle wait events, which will help you get a handle on several kinds of database performance issues..

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.

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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.

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