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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_QUERY(3)															    MSSQL_QUERY(3)

mssql_query - Send MS SQL query

SYNOPSIS
mixed mssql_query (string $query, [resource $link_identifier], [int $batch_size]) DESCRIPTION
mssql_query(3) sends a query to the currently active database on the server that's associated with the specified link identifier. PARAMETERS
o $query - An SQL query. o $link_identifier - A MS SQL link identifier, returned by mssql_connect(3) or mssql_pconnect(3). If the link identifier isn't specified, the last opened link is assumed. If no link is open, the function tries to establish a link as if mssql_connect(3) was called, and use it. o $batch_size - The number of records to batch in the buffer. RETURN VALUES
Returns a MS SQL result resource on success, TRUE if no rows were returned, or FALSE on error. EXAMPLES
Example #1 mssql_query(3) example <?php // Connect to MSSQL $link = mssql_connect('KALLESPCSQLEXPRESS', 'sa', 'phpfi'); if (!$link || !mssql_select_db('php', $link)) { die('Unable to connect or select database!'); } // Do a simple query, select the version of // MSSQL and print it. $version = mssql_query('SELECT @@VERSION'); $row = mssql_fetch_array($version); echo $row[0]; // Clean up mssql_free_result($version); ?> NOTES
Note If the query returns multiple results then it is necessary to fetch all results by mssql_next_result(3) or free the results by mssql_free_result(3) before executing next query. SEE ALSO
mssql_select_db(3), mssql_connect(3). PHP Documentation Group MSSQL_QUERY(3)
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