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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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FBSQL_QUERY(3)								 1							    FBSQL_QUERY(3)

fbsql_query - Send a FrontBase query

SYNOPSIS
resource fbsql_query (string $query, [resource $link_identifier], [int $batch_size]) DESCRIPTION
Sends a $query to the currently active database on the server. If the query succeeds, you can call fbsql_num_rows(3) to find out how many rows were returned for a SELECT statement or fbsql_affected_rows(3) to find out how many rows were affected by a DELETE, INSERT, REPLACE, or UPDATE statement. PARAMETERS
o $query - The SQL query to be executed. Note The query string shall always end with a semicolon. o $ link_identifier -A FrontBase link identifier returned by fbsql_connect(3) or fbsql_pconnect(3).If optional and not specified, the function will try to find an open link to the FrontBase server and if no such link is found it will try to create one as if fbsql_connect(3) was called with no arguments. o $batch_size - RETURN VALUES
fbsql_query(3) returns TRUE (non-zero) or FALSE to indicate whether or not the query succeeded. A return value of TRUE means that the query was legal and could be executed by the server. It does not indicate anything about the number of rows affected or returned. It is perfectly possible for a query to succeed but affect no rows or return no rows. For SELECT statements, fbsql_query(3) returns a new result identifier that you can pass to fbsql_result(3). fbsql_query(3) will also fail and return FALSE if you don't have permission to access the table(s) referenced by the query. EXAMPLES
The following query is syntactically invalid, so fbsql_query(3) fails and returns FALSE: Example #1 fbsql_query(3) example <?php $result = fbsql_query("SELECT * WHERE 1=1") or die ("Invalid query"); ?> The following query is semantically invalid if my_col is not a column in the table my_tbl, so fbsql_query(3) fails and returns FALSE: Example #2 fbsql_query(3) example <?php $result = fbsql_query ("SELECT my_col FROM my_tbl;") or die ("Invalid query"); ?> SEE ALSO
fbsql_affected_rows(3), fbsql_db_query(3), fbsql_free_result(3), fbsql_result(3), fbsql_select_db(3), fbsql_connect(3). PHP Documentation Group FBSQL_QUERY(3)
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