>>>>
>>>>An Index caching overload effect ?
>>>>
>>>>try, and post this time:
>>>>

>>>>use bhav_data
>>>>SET EXACT ON
>>>>=lOOKUP(symbol, m.THISVALUE,symbol)
>>>>SELECT date,open,high,low,close,tottrdqty,sma9,sma12,sma26 FROM bhav_data;
>>>>where symbol = m.THISVALUE  INTO CURSOR tempDETAIL nofilter
>>>>

>>>
>>>
>>>Minimum time taken is 9 secs
>>>
>>>but if i run the second time with the same value in thisvalue it runs under .5 secs
>>>
>>>like
>>>
>>>First run with thisvalue = 'ABCD' -- 10 secs
>>>second run with thisvalue = 'dfsd' -- 10 secs
>>>third run with thisvalue = 'ABCD' -- .5 secs
>>>
>>>that is wilhout cloing the table
>>
>>this confirm the caching effect.
>>
>>try
>>

>>SELECT date,open,high,low,close,tottrdqty,sma9,sma12,sma26 FROM bhav_data;
>>where symbol = m.THISVALUE AND symbol = symbol INTO CURSOR tempDETAIL nofilter
>>

>
>No the result is the same. the above doesnt make any difference.
>Can u hilight what u mean by cashing effect ? what is going on ?

VFP load data into an internal cache ( a buffer memory).

try this ( it minimize and clear the buffer, then the execution time is more stable ?):

SYS(3050, 1, 1) minimize the buffer size

sys(1104) && unload the buffer
SELECT .... WHERE .. = m.thisvalue INTO ...