Can I compare bind variable with fixed value in where cause

I found the problem buffer hit ratio < 70%. From monitoring, this below query is full table scan(8.5G)
I think full table scan is a problem from scanning 720MB buffer cache.
SELECT CT.LENS_ID,
TO_NUMBER (TO_CHAR (CT.EXPIRED_DATE, 'YYYYMMDD')) AS EXP_DATE,
CT.WAREHOUSE_ID,
COUNT (*) AS QTY
FROM TB_STK_BARCODE_CTRL CT
WHERE CT.EXPIRED_DATE IS NOT NULL
AND (:B7 = -1 OR CT.WAREHOUSE_ID = :B7)
AND (:B1 = -1 OR CT.LENS_ID = :B1)
AND CT.L_STATUS_ID = 'I'
GROUP BY CT.LENS_ID, TO_CHAR (CT.EXPIRED_DATE, 'YYYYMMDD'), CT.WAREHOUSE_ID;
I try to remove ":B7 = -1" from the query, and performance is OK. Index(WAREHOUSE_ID, LENS_ID, VERTICAL_TEXT, HORIZONTAL_TEXT) is used.
SELECT CT.LENS_ID,
TO_NUMBER (TO_CHAR (CT.EXPIRED_DATE, 'YYYYMMDD')) AS EXP_DATE,
CT.WAREHOUSE_ID,
COUNT (*) AS QTY
FROM TB_STK_BARCODE_CTRL CT
WHERE CT.EXPIRED_DATE IS NOT NULL
AND CT.WAREHOUSE_ID = :B7
AND CT.LENS_ID = :B1
AND CT.L_STATUS_ID = 'I'
GROUP BY CT.LENS_ID, TO_CHAR (CT.EXPIRED_DATE, 'YYYYMMDD'), CT.WAREHOUSE_ID;
any suggest please
Edited by: M.Suradech on Apr 8, 2012 8:11 PM

M.Suradech wrote:
AND (:B7 = -1 OR CT.WAREHOUSE_ID = :B7)
AND (:B1 = -1 OR CT.LENS_ID = :B1)Looks like you are attempting to make some "generic" type of query.
I'd recommend implementing something like this instead of what you currently have.
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1669972300346534908

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