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scan and my own wapsite

Posted By:      Posted Date: May 22, 2011    Points: 0   Category :SharePoint
 
To whom it may concern I ll love to have a scan on my phone and have my own wapsite


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Hi,

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Hi,

I have a stored procedure where the performance is bad. The Execution plan shows 5 table scans each of cost 12%. The data is being pulled from the table using the following where clause.

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Could anyone help me in finding out why this is happening.

 

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I have a simple query to select all coumns from a table where primary key column in (list of values).  The primary key has  clustered index on primary key column.  The query was executing very effieicntly until recently (have around 4 million rows in the table and growing steadily around 8-10K rows per month).  Recently this query became a bottleneck (takes 45 secs to a min to execute) when I looked at the plan it was doing index scan on clustered primary key column index instead of index seek,  I checked on index fragmentation it was 1.48 percent.

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Reverts back to Index scan from index seek

  

I have a simple query to select all coumns from a table where primary key column in (list of values).  The primary key has  clustered index on primary key column.  The query was executing very effieicntly until recently (have around 4 million rows in the table and growing steadily around 8-10K rows per month).  Recently this query became a bottleneck (takes 45 secs to a min to execute) when I looked at the plan it was doing index scan on clustered primary key column index instead of index seek,  I checked on index fragmentation it was 1.48 percent.

I created a new non clustered unique index on primary key column with all other columns in include part of the index (coverage index) and created execution plan, it said index seek on new index, when i executed the query it executed in less than a sec (8milli secs to be precise), I thought everything was fine and executed the same query again this time it took 45 secs again, I looked at the plan it says index scan on the new index I created.

This trend continues every time I drop and re-create the new index it does index seek first time and switches over to index scan when I execute the same query after the first try.  I am totally confused and would like to know what is causing the issue.  Any help is highly appreciated.  Thanks in advance for any help.


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