Re: tuning PL/SQL

From: Michael Thomas <mhthomas_at_yahoo.com>
Date: Mon, 30 Aug 2004 18:23:46 -0700 (PDT)
Message-ID: <20040831012346.68069.qmail@web50603.mail.yahoo.com>

Hi,

• David <thump_at_cosmiccooler.org> wrote:
  > I have been working on tracing session statements to
  > derive the explain
  > plan and LIO values.
  > What does one do to accomplish the same when PL/SQL
  > code is encountered.
  > Extended SQL Tracing provides no explain plan or
  > fetch(buffer gets) values
  > Also, to confirm is it disk or query fetch divided
  > by count to determine
  > LIO figure?
  > Thanks
  > --
  > ..
  > David
  >
  
  1. One solution might be to identify how much time each line of PL/SQL consumes and how many times each line executes. Have you tried DBMS_PROFILER?

The 9.2 Oracle docs on DBMS_PROFILER start here: http://tinyurl.com/6pwmf

It would help identify specific portions of code to for optimization work. For example, this might give you prioritized information on which SQL statements need tuning (based on response time).

2) I believe the Hotsos SQL test harness can now profile PL/SQL, including statistics and timed events, based on my review of the latest test harness version. But, this is a relatively new feature, and I have not tested it yet. Docs says it does not do plans on SQL statements within PL/SQL.

3) There are other good methods to measure PL/SQL performance. Examples include code in C McDonald's new PL/SQL book, and using logoff session triggers to gather OWI related details suggested in the new OWI book.

HTH. Good luck.

Regards,

Mike Thomas                 

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Received on Mon Aug 30 2004 - 20:19:24 CDT