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POoptimize SP on sql server 2k5
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2012-01-18T14:10:39.107
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<p>I asked a question <a href="https://stackoverflow.com/questions/8883355/query-large-table/8884270#8884270">query large table</a>. This is in response to the same question. There are 4 columns in the <code>where</code> clause. I replaced the cursor with the <code>while</code> loop. But didn't help much. The difference between old and new code is 1 second only. But one thing I noticed. There is one column <code>[col name] varchar(255) allow nulls</code>. If I don't query that column the execution time of new code is half. What can be done to improve the speed? All the columns in the <code>where</code> clause are indexed. Any help is appreciated.</p> <p>while' loop is sample code.</p> <pre><code>declare @temp table (col1 INT PRIMARY KEY, col2 VARCHAR(10), col3 VARCHAR(40), col4 VARCHAR(40) ) INSERT INTO @temp (col1,col2,col3,col4) SELECT col1,col2,SUBSTRING(col3,1,40),col4 FROM dbo.Clients WHERE col5 <> 4 ORDER BY col1 select @from=1,@to=@@rowcout SELECT TOP 1 @col1 = col1,@col2=col2,@col3=col3,@col4=col4 FROM @Temp ORDER BY col1 while @from <= @to begin insert into table2 (....) select ... from table3 where [col name1] = par1 and ([col name2] =par2 or [col name2] = par3] ) --this one takes time insert into table2 (...) select .. from table3 where [col name] like @par1 AND ([col name] like par2 or [col name] like par3) SELECT TOP 1 @col1 = col1,@col2=col2,@col3=col3,@col4=col4 FROM @Temp where col1 > @col1 ORDER BY col1 set @from = @from + 1 end </code></pre>
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optimize SP on sql server 2k5
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