Report Performance Issue and Strange Execution Log Data

Today we have had a report suddenly start taking a long time to execute.
Looking at the Report Server executionLog3 table/view we have the following information for the query in question.
<Connection>
<ConnectionOpenTime>1</ConnectionOpenTime>
<DataSets>
<DataSet>
<Name>ReportDataset</Name>
<RowsRead>7</RowsRead>
<TotalTimeDataRetrieval>150013</TotalTimeDataRetrieval>
<ExecuteReaderTime>3</ExecuteReaderTime>
</DataSet>
</DataSets>
</Connection>
Supposedly the time taken to retrieve the data is around 150 seconds. However, running a profiler trace while running the report in SSRS shows the query executing in under 1 second.
Indeed running a profiler trace for anything on the server with a duration greater than 60 seconds isn't returning anything. I can only assume the above data is wrong when it says 150 seconds to retrieve the data. IT IS taking that long to run
the report though - so the question is - where is the time going?
Why can't I find a slow query on the server but SSRS thinks there is?
LucasF
EDIT: This was fixed by restarting the report server. Any ideas on why this might occur?

Hi Lucas,
According to your description, you find the <TotalTimeDataRetrieval> in ExecutionLog3 is larger than the profiler trace time.
In Reporting Services, to analyze the performance of the report, we usually check the TimeDataRetrieval to find the time we spend on retrieving the data. It’s the time needed for SQL Server to retrieve the data of all datasets in your report. So in your
scenario, please check if the TimeDataRetrieval is equal to the time in profiler trace.
Reference:
More tips to improve performance of SSRS reports
If you have any question, please feel free to ask.
Best regards,
Qiuyun Yu
Qiuyun Yu
TechNet Community Support

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Hi All,
Pl. give me the ABAP performance issue and improvement points.
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Performance tuning for Data Selection Statement
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The for all entries creates a where clause, where all the entries in the driver table are combined with OR. If the number of
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length of the WHERE clause.
The plus
Large amount of data
Mixing processing and reading of data
Fast internal reprocessing of data
Fast
The Minus
Difficult to program/understand
Memory could be critical (use FREE or PACKAGE size)
Some steps that might make FOR ALL ENTRIES more efficient:
Removing duplicates from the the driver table
Sorting the driver table
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Small amount of data
Mixing processing and reading of data
Easy to code - and understand
The minus:
Large amount of data
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The plus
Very large amount of data
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In some cases the fastest
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SELECT * FROM SBOOK.
CHECK: SBOOK-CARRID = 'LH' AND
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SELECT * FROM T100
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C4A = T100-MSGNR.
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Select with view
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ENDLOOP.
LOOP AT TAB WHERE K = KVAL.
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Copying internal tables
REFRESH TAB_DEST.
LOOP AT TAB_SRC INTO TAB_DEST.
APPEND TAB_DEST.
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Edited by: user9363364 on Sep 1, 2010 7:59 AM

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