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Buffer Cache Tuning

The first case deals with a typical problem.  A trouble ticket has been opened and assigned to the DBA.  The complaint is that the application is running slowly. Therefore, the DBA is asked to “make the database faster”.  This is not a foreign request to a DBA. 

STATSPACK was previously installed, and the DBA is unable to immediately determine that any specific userid is being affected more than others; therefore, the DBA will take a few snapshots and gather about a two-minute interval of data.   

After getting the snapshots, the DBA runs spreport.sql and looks at the report. Figure 7.10 shows the first section to be viewed. 

Instance Efficiency Percentages (Target 100%)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

      Buffer Nowait %:  100.00      Redo NoWait %:    100.00

      Buffer Hit    %:  30.48 In-memory Sort %: 99.27

      Library Hit   %:  89.09 Soft Parse %:     92.36

      Execute to Parse %:     28.67 Latch Hit %:      100.00

      Parse CPU to Parse Elapsed%:  81.37 % Non-Parse CPU:  89.55


The above book excerpt is from:

Oracle Wait Event Tuning

High Performance with Wait Event Iinterface Analysis 

ISBN 0-9745993-7-9  

Stephen Andert 

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

  
 

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