OPNQRYF access path rebuilds & OPTIMIZATION ??

I have a logical something like this  ..
0004.00        A          K DDNT

0005.00        A          K ACCTNO

0006.00        A          S DDNT                      VALUES(0 100 200)


And i use the OPNQRYF this way for selecting only 0, 100  DDNT records
                                             ........ Ovrride with
Share(*Yes) ...
0004.00                OPNQRYF    FILE((FLPHPA)) OPTION(*ALL) +
0005.00                             QRYSLT('DDNT = 0  *or DDNT = 200') +

0006.00                             KEYFLD(*FILE) SEQONLY(*NO) +

0007.00                             OPNSCOPE(*ACTGRPDFN)
ALWCPYDTA(*OPTIMIZE) +
0007.01                             OPTIMIZE(*FIRSTIO)
                                           ............. CALL RPG1

1 ) In this case can i be sure that it would not rebuild the access path
every time i call the program ?.
2)  And in case i remove the Selects in Logical will OPNQ build the acess
path every time ?

3) And is this a effective method for random file processing( First a
screen full of records are shown , then  depending on the
Position to Values entered , the screen is redisplayed , or if a selection
is made from the records on the screen, you shift to
update the record).

Generally it will be more than 20% of the records selected and the number
of records will be more than 30,000.

Your guidance will be very helpful ...
Thanks in advance,
Chellaprabhu.







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