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STATSPACK benefits

In addition to using these views and scripts, it is possible to use STATSPACK to gather much, if not all, of the same information.  STATSPACK has advantages such as built in snapshot statistics gathering instead of the process shown earlier.  It also has a ready-made query in the form of a report called spreport.sql which can be found in most $ORACLE_HOME/rdbms/admin directories. 

The install is pretty straightforward, and it must be done before any data can be retrieved using it.  This could be a definite disadvantage in a reactive performance tuning situation where a solution is needed NOW.  Another problem could be that the report it produces is rather general in nature.  While using tools like oraperf.com can help navigate this report, nothing beats a simple query that tells where a given session is waiting when the user is asking why this report is taking so long.  That will be examined more with the use of STATSPACK in Chapter 7.

Benefits

In order to wrap up the discussion of the Wait Interface, it is important to highlight the benefits of using it instead of, or in addition to, other tuning methodologies.  The nature of the Wait Interface makes analysis more precise than ratios.  The analysis shows the specific area of concern, which allows for a more direct resolution.  Whereas ratios take details of the activity of the database and summarize them into a single metric, the Wait Interface uses the details to let the Remote DBA see what is slowing the database down.  Ratios have a “one-trick pony” solution – the typical solution to a bad ratio is to throw more memory at the problem, which doesn’t always work.  The Wait Interface simply provides more accurate information, which may lead to adding more memory if warranted, but could lead elsewhere.


The above book excerpt is from:

Oracle Wait Event Tuning

High Performance with Wait Event Interface Analysis 

ISBN 0-9745993-7-9  

Stephen Andert 

http://www.rampant-books.com/book_2004_2_wait_tuning.htm

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