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How to know whether problem related to query or components

Posted on 2009-07-14
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Last Modified: 2012-05-07
Hello,

when we are running a select query in test environment it is taking only 1 sec time to execute but when we are running the same in our production (clustered environment) it is taking around 4 min to execute.

how to know that whether the problem related to query or component or network performance? please, let me know the way or steps to resolve the issue.

thanks..
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Question by:krishna_harik
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LVL 142

Assisted Solution

by:Guy Hengel [angelIII / a3]
Guy Hengel [angelIII / a3] earned 130 total points
ID: 24847579
check the explain plan of the query in both environments.

possible issues:
* not the same indexes
* not the same amount of data
* not the same RAM/CPU config
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by:udaydidigam
udaydidigam earned 130 total points
ID: 24847584
did u create indexs for the tables.
if not the problem due to index not defined
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krishna_harik earned 0 total points
ID: 24847771
we restored the same database in the test environment and hardware is also similar.
if it is problem with indexes, then how to find the problem or is their any other approach.
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LVL 142

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by:Guy Hengel [angelIII / a3]
Guy Hengel [angelIII / a3] earned 130 total points
ID: 24847799
>we restored the same database in the test environment
after restore, you need to refresh the statistics

>and hardware is also similar.
similar is not equal. please clarify the differences.

anyhow, get the explain plans on both servers to see the differences.
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by:St3veMax
St3veMax earned 140 total points
ID: 24847849
Update the statistics. Just because you restored the live DB into the test db, doesent mean the index's will kick in.

HTH
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Assisted Solution

by:udaydidigam
udaydidigam earned 130 total points
ID: 24847854
Just check the indexes properties are clustered or not if not make it as clustered
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LVL 13

Assisted Solution

by:St3veMax
St3veMax earned 140 total points
ID: 24847865
>>Just check the indexes properties are clustered or not if not make it as clustered

be aware that you cannot have more than one clustered index per physical table...
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Author Comment

by:krishna_harik
ID: 24848098
st3ve,

how to check whether the indexes properties are clustered or not. since, the select query consists of more joins having 8 tables in it. so, i have check all the tables properties.
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Assisted Solution

by:Randy Wilson
Randy Wilson earned 100 total points
ID: 24848468
Have you turned on SQL Profiler and checked to see how long it takes the query to "reach" the server, and how long it takes to return a resultset?
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Author Comment

by:krishna_harik
ID: 24892512
Hi all,

Thank you very much for your valuable inputs. The issue was resolved by running 'UPDATE STATISTICS' command on all the tables using by the script to get the output.
 
Now the script executing in 3 sec. Based on the situation, i have queries

Queries:
1. Before running the script i ran Rebuild Index command on all the tables in the databases and ran the same script but still it took 4min to execute. Rebuild Index will update Statistics, so why it was not effected the performance.

2. What is difference between running UPDATE STATISTICS WITH FULL SCAN and UPDATE STATISTICS WITH FULLSCAN, NORECOMPUTE.

3. we are runnig a job through maintenance plan for Reorganize Index and Update Statistics running it once in a week. I found in job report txt file that few tables are having
'update statistics with fullscan' and few tables with 'update statistics with fullscan, recompute'. May i know the difference?

Please, let me know the answers for above queries.

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Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 24892670
RTFM:http://msdn.microsoft.com/en-us/library/ms187348(SQL.90).aspx

NORECOMPUTE
 
    Specifies that statistics that become out of date are not automatically recomputed. Statistics become out of date depending on the number of INSERT, UPDATE, and DELETE operations performed on indexed columns. When specified, this option causes the Database Engine to disable automatic statistics rebuilding. To restore automatic statistics recomputation, reissue UPDATE STATISTICS without the NORECOMPUTE option or run sp_autostats
 
 
it is based on the table's setting if the statistics are to be recomputed automatically or not.

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Author Comment

by:krishna_harik
ID: 25184018
Hi,
please, could any one help me out on below query.

Query:
Before running the script i ran Rebuild Index command on all the tables in the databases and ran the same script but still it took 4min to execute. Rebuild Index will update Statistics right?, so why it was not effected.

If the above was not clear, please read the previous posts.
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