By Christian Antognini
What do you do while your database software isn’t operating speedy sufficient? You troubleshoot, after all. discovering the sluggish a part of an software is usually the straightforward a part of the conflict. It’s discovering an answer that’s tricky. Troubleshooting Oracle Performance is helping by means of offering a scientific method of addressing the underlying factors of negative database software performance.
- Written for developers through an software developer who has realized by means of doing
- Gives a scientific method of solving database software functionality problems
- Helps you propose for functionality as you will for the other software requirement
What you’ll learn
- See find out how to deal with and plan for functionality as a easy program requirement.
- Identify functionality difficulties utilizing a scientific and repeatable strategy.
- Configure your question optimizer to fulfill your program functionality ambitions.
- Optimize desk accesses, joins, and actual desk format.
- Read and realize inefficient SQL execution plans.
- Reduce inefficiencies from an excessive amount of procedural code.
Who is that this booklet for?
For software builders and database directors concerned with troubleshooting functionality difficulties of Oracle-based applications
About the Apress seasoned Series
The Apress professional sequence books are sensible, specialist tutorials to maintain you on and relocating up the pro ladder.
You have got the task, now you must hone your talents in those tricky aggressive occasions. The Apress seasoned sequence expands your abilities and services in just the components you wish. grasp the content material of a professional ebook, and you'll continuously be capable to get the task performed in a certified improvement venture. Written via specialists of their box, seasoned sequence books from Apress provide the hard-won strategies to difficulties you'll face on your expert programming career.
Related Titles from Apress
- Cost-Based Oracle Fundamentals
- The paintings and technological know-how of Oracle functionality Tuning
- Forecasting Oracle Performance
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Additional resources for Troubleshooting Oracle Performance
Sample text
1. The concept of bind variable peeking is simple. During the physical optimization phase, the query optimizer peeks at the values of bind variables and uses them as literals. The problem with this approach is that the generated execution plan depends on the values provided by the first execution. sql, illustrates this behavior. Note that the first optimization is performed with the value 990. Consequently, the query optimizer chooses a full table scan. It is this choice, since the cursor is shared (the sql_id and the child number are the same), that impacts the second query that uses 10 for the selection.
For the moment, just think that this is the way things generally work. fm Page 16 Wednesday, March 26, 2008 3:56 PM 16 CHAPTER 2 ■ KE Y CONCEPTS Open cursor Parse cursor Cursor returns data? Yes Define output variables No Cursor uses bind variables? Yes Bind input variables No Execute cursor Cursor returns data? Yes Fetch cursor No More data? No Close cursor Figure 2-1. fm Page 17 Wednesday, March 26, 2008 3:56 PM CHAPTER 2 ■ KEY CONCEPTS Depending on the programming environment or techniques you are using, the different steps depicted in Figure 2-1 may be implicitly or explicitly executed.
Its parsed representation that includes the execution plan (which describes how the SQL engine will execute the SQL statement) is loaded in the shared pool, specifically, in the library cache. The structure in the UGA is updated to store a pointer to the location of the shareable cursor in the library cache. The next section will describe parsing in more detail. Define output variables: If the SQL statement returns data, the variables receiving it must be defined. This is necessary not only for queries but also for DELETE, INSERT, and UPDATE statements that use the RETURNING clause.