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Top Forums UNIX for Advanced & Expert Users mysql select query optimization.. Post 302496063 by senkerth on Saturday 12th of February 2011 03:18:58 AM
Old 02-12-2011
mysql select query optimization..

hi..
i need to optimize my select query ..

my situation is like this ..
i have 15 lac recors in my table..
the following query takes nine seconds to give the required output..
Code:
SELECT max(ah.AUC_AMT),
SUBSTRING_INDEX(GROUP_CONCAT(SUBSTRING_INDEX(ah.AUC_CUS_NAME,'@',1) order by AUC_AMT DESC SEPARATOR '|_|'),'|_|',3), 
timediff(av.AUC_END_TIM,time(now())) as RemTime, 
av.AUC_END_TIM,av.AUC_RSV_PRC,av.AUC_DATE,av.AUC_STATUS 
from auc_hist_tbl as ah, aucveh_sched_tbl as av 
where ah.AUC_UNI_NO = '' 
AND av.AUC_UNI_NO = ''

auc_hist_tbl has 15 lac records ... i have indexed AUC_UNI_NO ..
but still its taking time ..
can u guide where's my query going wrong..
thanks ..

Last edited by Scott; 02-12-2011 at 04:58 AM.. Reason: Code tags, PLEASE...
 

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MSSQL_FETCH_ASSOC(3)													      MSSQL_FETCH_ASSOC(3)

mssql_fetch_assoc - Returns an associative array of the current row in the result

SYNOPSIS
array mssql_fetch_assoc (resource $result_id) DESCRIPTION
Returns an associative array that corresponds to the fetched row and moves the internal data pointer ahead. mssql_fetch_assoc(3) is equiv- alent to calling mssql_fetch_array(3) with MSSQL_ASSOC for the optional second parameter. PARAMETERS
o $result_id - The result resource that is being evaluated. This result comes from a call to mssql_query(3). RETURN VALUES
Returns an associative array that corresponds to the fetched row, or FALSE if there are no more rows. EXAMPLES
Example #1 mssql_fetch_assoc(3) example <?php // Send a select query to MSSQL $query = mssql_query('SELECT [username], [name] FROM [php].[dbo].[userlist]'); // Check if there were any records if (!mssql_num_rows($query)) { echo 'No records found'; } else { // Print a nice list of users in the format of: // * name (username) echo '<ul>'; while ($row = mssql_fetch_assoc($query)) { echo '<li>' . $row['name'] . ' (' . $row['username'] . ')</li>'; } echo '</ul>'; } // Free the query result mssql_free_result($query); ?> PHP Documentation Group MSSQL_FETCH_ASSOC(3)
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