run to analyze the ratio is 49 any problem

Hello

run to analyze the ratio is 49 any problem?

I guess that you are looking at a Statspack or AWR report?

First, it is important to understand what is the Execute ratio analysis.

It is calculated as:

round(100*(1-:prse/:exe),2)

So the idea is, for a given SQL statement, in an ideal world, analyze you once and run it several times. If you do this, your analysis Execute ratio will tend towards 100%. 100% is a "perfect score".

You analyze more, compared to the executions, the ratio will fall. If you analyze once per run, your analysis Execute ratio will increase to 0%. It's not good, but it could actually be even worse than that. Some applications of brain dead actually do an analysis more than executions. If this happens, your analysis Execute ratio will be negative.

Thus, the 49 is "bad"? What is bad? Well, it depends. While it is true that any analysis Execute ratio that is less than 90 could potentially be improved, the question really is how much that will benefit your system?

So, you should ask yourself a few questions. First of all, you have even a probem performance? If not, then any effort spent tuning system is almost certainly a waste of time. If you do have a performance problem, you should be profiling critical, in order to analyse and understand business processes where they spend their time. If one or more, bad execution, critical business process spends too much time on the analysis, then it may be worth looking at what is happening.

In general, such as Parse Execute, buffer cache hit ratios, etc., are almost never useful in isolation. However, if all you have is an AWR or Statspack report, and you try to understand if the ratio Execute analysis needs attention, then you should look at some other numbers in the report. Review the Top 5 timed events; If none of them have nothing to do with the analysis? If this isn't the case, then the analysis probably isn't a problem. Look at % of the Non-Parse CPU; If it is very high, said in the early 1990s, almost certainly analysis isn't a problem important, so who cares about the Parse Execute ratio?

Finally, if you do think that, in your case, Execute ratio analysis is a problem, it is important to know that the only way to improve it is by reducing the number of analysis or to increase the number of executions. And, the only way to change the number of analysis or executions, by changing the client program. There is no instance level control or a parameter that will have an impact on this statistic.

Hope that helps you understand how to interpret this statistic,

-Mark

Tags: Database

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