Plain Explain and s methods (tools) for to improve Performance

Hi
How can I do to use Plain Explain and others methods for to impove performance ?
Where can I to find tutorial about it ?
thank you in advance

Hi
How can I do to use Plain Explain and others
methods for to impove performance ?
Internally there are potentially several hundred 'procedures' that can be assembled in different ways to access data. For example, when getting one row from a table, you could use an index or a full table scan.
Explain Plan shows the [proposed] access path, or complete list of the procedures, in the order called, to do what the SQL statement is requesting.
The objective with Explain Plan is to review the proposed access path and determine whether alternates, through the use of hints or statistics or indexes or materialized views, might be 'better'.
You often use Wait analysis, through StatsPack, AWR/ADDM, TKProf, Trace, etc. to determine which SQL statement is likely causing a performance issue.
>
Where can I to find tutorial about it ?Ah ... the $64K question. If we only knew ...
There are so many variables involved, that most tutorials are nearly useless. The common approach therefore is to read - a lot. And build up your own 'interpretation' of the reading.
Personal suggestion is to read (in order)
1) Oracle's Database Concepts manual (described some of 'how' this is happening)
2) Oracle's Performance Tuning manual (describes more of 'how' as related to performance and also describes some of the approaches)
3) Tom Kyte's latest book (has a lot of demos and 'proofs' about how specific things work)
4) Don Burleson's Statspack book (shows how to set up and do some basic interpretation)
5) Jonathan's book (how the optimizer works - tough reading, though)
6_ any book by the Oak Table (http://oaktable.net)
Beyond that is any book that contains the words 'Oracle' and 'Performance' in the title or description. BUT ... when reading, use truck-loads, not just grains, of salt.
Verify everything. I have seen an incredible amount of mistakes ... make 'em mysellf all the time, so I tend to recognize them when I see them. Believe nothing unless you have proven it for yourself.. Even then, realize there are exceptions and boundary conditions and ibgs and patches and statistics and CPU and memory and disk speed issues that will change ehat you have proven.
It's not hopeless. But it is a lot of work and effort. And well rewarded, if you decide to get serious.

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Plain Explain and s methods (tools) for to improve Performance

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