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  Oracle Tips by Burleson

SPREPORT Load Profile

Earlier, while learning about the 3rd party Profiler, there was a section with a resource profile.  That resource profile was used to show the various response-time components.  Similarly, the Load Profile section in the STATSPACK report is a characterization of the amount of work that the database was doing during the report interval.  The components are measured in two ways; per second and per transaction.  These components are statistics just like logical and physical reads as well as parsing, sorting and other methods used to measure how busy a database is.

Each of the elements in the Load Profile contributes to the amount of time it takes to process any given statement.  For example, if users are reporting widespread problems with performance, and the number of sorts per second is significantly higher than it was during the baseline measurement, it may be helpful to look for any recently introduced code with heavy sort activity.  This could be related to code that is performing unnecessary sorts or to an increase in the normal amount of data being sorted, and may require an adjustment in the sort_area_size for some or all users. 

If there is a baseline measurement available, the Load Profile section of this report is a good place to start the analysis.  If the baseline is from a time when there was user consensus that performance was good, then the Load Profile from a “bad” period can be compared to the baseline to help find any discrepancies.   

Instance Efficiency Percentages (Target 100%)


      Buffer Nowait %:  100.00      Redo NoWait %:    100.00
      Buffer Hit    %:  92.80 In-memory Sort %: 99.98
      Library Hit   %:  98.97 Soft Parse %:     95.73
      Execute to Parse %:     95.30 Latch Hit %:      100.00
      Parse CPU to Parse Elapsed %: 41.47 % Non-Parse CPU:  73.16 
Shared Pool Statistics        Begin End
            -------     ------
      Memory Usage %:   95.70 95.68
      % SQL with executions>1:      69.23 85.19
      % Memory for SQL w/exec>1:    46.21 56.05

The above book excerpt is from:

Oracle Wait Event Tuning

High Performance with Wait Event Interface Analysis 

ISBN 0-9745993-7-9  

Stephen Andert


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