RDA - Top SQL report
- From: "Srikanth Kalluri" <SKalluri@xxxxxxxxx>
- To: "Oracle-L Freelists" <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 1 Mar 2006 15:10:52 -0800
Hi,
The question is regarding (Remote Diagnostics Assistant; Metalink Note:
314422.1) Oracle Support provides to troubleshoot performance issues in a
database {RDA} and the calculation of the "Top SQL Report"
More specifically, I am curious how the following ratios are deemed "Expected
Respose Time (in Seconds)"
From v$sqlarea:
{ (disk_reads/executions)/50 }
{ (buffer_gets/executions)/500 }
Also, what is the significance of the numbers 50 and 500 respectively?
Queries used in the report:
select
sql_text,
executions,
disk_reads / decode(executions,0,1, executions) / 50
from
v$sqlarea
where
disk_reads / decode(executions,0,1, executions) / 50 > 100
order by executions desc;
select
sql_text,
executions,
buffer_gets / decode(executions,0,1, executions) / 500
from
v$sqlarea
where
buffer_gets/ decode(executions,0,1, executions) / 500 > 100
order by executions desc;
Thanks,
Sri
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