SQL Question (selection by RRN) -- MIDRANGE-L

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i'm playing with SQL, and I was under the assumption that when you select by
RRN that it should be very fast.  I'm finding that isn't the case.  

Any ideas?  I'm doing something like:

SELECT CHAR(A.ODPERDSC) FROM CSODATA/OCSDETAIL A WHERE
 RRN(A) = 84201 FOR READ ONLY OPTIMIZE FOR 1 ROWS     

Takes a while.  (File is very large).   In other cases I've had great
results.  Shouldn't RRN selection be BAM! right there?
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