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POQuery runs fast, but runs slow in stored procedure
 

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  1. POQuery runs fast, but runs slow in stored procedure
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    <p>I am doing some tests using the SQL 2005 profiler.</p> <p>I have a stored procedure which simply runs one SQL query.</p> <p>When I run the stored procedure, it takes a long time and performs 800,000 disk reads.</p> <p>When I run the same query separate to the stored procedure, it does 14,000 disk reads.</p> <p>I found that if I run the same query with OPTION(recompile), it takes 800,000 disk reads.</p> <p>From this, I make the (possibly erroneous) assumption that the stored procedure is recompiling each time, and that's causing the problem.</p> <p>Can anyone shed some light onto this? </p> <p>I have set ARITHABORT ON. (This solved a similar problem on stackoverflow, but didn't solve mine)</p> <p>Here is the entire stored procedure:</p> <pre><code>CREATE PROCEDURE [dbo].[GET_IF_SETTLEMENT_ADJUSTMENT_REQUIRED] @Contract_ID int, @dt_From smalldatetime, @dt_To smalldatetime, @Last_Run_Date datetime AS BEGIN DECLARE @rv int SELECT @rv = (CASE WHEN EXISTS ( select * from view_contract_version_last_volume_update inner join contract_version on contract_version.contract_version_id = view_contract_version_last_volume_update.contract_version_id where contract_version.contract_id=@Contract_ID and volume_date &gt;= @dt_From and volume_date &lt; @dt_To and last_write_date &gt; @Last_Run_Date ) THEN 1 else 0 end) -- Note that we are RETURNING a value rather than SELECTING it. -- This means we can invoke this function from other stored procedures return @rv END </code></pre> <p>Here's a script I run that demonstrates the problem:</p> <pre><code>DECLARE @Contract_ID INT, @dt_From smalldatetime, @dt_To smalldatetime, @Last_Run_Date datetime, @rv int SET @Contract_ID=38 SET @dt_From='2010-09-01' SET @dt_To='2010-10-01' SET @Last_Run_Date='2010-10-08 10:59:59:070' -- This takes over fifteen seconds exec GET_IF_SETTLEMENT_ADJUSTMENT_REQUIRED @Contract_ID=@Contract_ID,@dt_From=@dt_From,@dt_To=@dt_To,@Last_Run_Date=@Last_Run_Date -- This takes less than one second! SELECT @rv = (CASE WHEN EXISTS ( select * from view_contract_version_last_volume_update inner join contract_version on contract_version.contract_version_id = view_contract_version_last_volume_update.contract_version_id where contract_version.contract_id=@Contract_ID and volume_date &gt;= @dt_From and volume_date &lt; @dt_To and last_write_date &gt; @Last_Run_Date ) THEN 1 else 0 end) -- With recompile option. Takes 15 seconds again! SELECT @rv = (CASE WHEN EXISTS ( select * from view_contract_version_last_volume_update inner join contract_version on contract_version.contract_version_id = view_contract_version_last_volume_update.contract_version_id where contract_version.contract_id=@Contract_ID and volume_date &gt;= @dt_From and volume_date &lt; @dt_To and last_write_date &gt; @Last_Run_Date ) THEN 1 else 0 end) OPTION(recompile) </code></pre>
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