Select statement is taking lot of time for the first time Execution.?

Hi Experts,
I am facing the following issue. I am using one select statement to retrieve all the contracts from the table CACS_CTRTBU according to FOR ALL ENTRIES restriction.
if p_lt_zcacs[] is not initial.
SELECT
           appl ctrtbu_id version gpart
           busi_begin busi_end tech_begin tech_end
           flg_cancel_obj flg_cancel_vers int_title
         FROM cacs_ctrtbu INTO TABLE lt_cacs FOR ALL ENTRIES IN p_lt_zcacs
                                                WHERE
                                                appl EQ gv_appl
                                                AND ctrtbu_id EQ p_lt_zcacs-ctrtbu_id
                                                AND  ( flg_cancel_vers EQ '' OR version EQ '000000' )
                                                AND flg_cancel_obj EQ ''
                                                AND busi_begin LE p_busbegin
                                                AND busi_end GT p_busbegin.
endif.
The WHERE condition is in order with the available Index. The index has  APPL,CTRTBU_ID,FLG_CANCEL_VERS and FLG_CANCEL_OBJ.
The technical settings of table CACS_CTRTBU says that the "Buffering is not allowed"
Now the problem is , for the first time execution of this select statement, with 1.5 lakh entries in P_LT_ZCACS table, the select statement takes 3 minutes.
If I execute this select statement again, in another run with Exactly the same parameter values and number of entries in P_LT_ZCACS ( i.e 1.5 lakh entries), it gets executed in 3-4 seconds.
What can be the issue in this case? Why first execution takes longer time?.. Or is there any way to modify the Select statemnt to get better performance.
Thanks in advance
Sreejith A P

Hi,
>
sree jith wrote:
> What can be the issue in this case? Why first execution takes longer time?..
> Sreejith A P
Sounds like caching or buffering in some layer down the i/o stack. Your first execution
seems to do the "physical I/O" where your following executions can use the caches / buffers
that are filled by your first exectution.
>
sree jith wrote:
> Or is there any way to modify the Select statemnt to get better performance.
> Sreejith A P
If modifying your SELECTS statement or your indexes could help depends on your access details:
does your internal table P_LT_ZCACS  contain duplicates?
how do your indexes look like?
how does your execution plan look like?
what are your execution figures in ST05 - Statement Summary?
(nr. of executions, records in total, total time, time per execuiton,  records per execution, time per record,...)
Kind regards,
Hermann

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