oracle performance tuning



        --------------------------------------------------------------------
            -- out 5,6
            t1.join_key = t2.join_key AND
            (
              ( INSTR(t1.SERVICE_NUMBER, t2.SERVICE_DIGIT) > 0 AND INSTR(t1.SERVICE_PLATFORM, t2.SERVICE_PLATFORM) > 0)
--              ( t1.SERVICE_NUMBER    like '%' || t2.SERVICE_DIGIT || '%'   and t1.SERVICE_PLATFORM  like '%' || t2.SERVICE_PLATFORM || '%')
              OR
              ( t1.SERVICE_VARIANT_ID= TO_CHAR(t2.SERVICE_VARIANT_ID )    AND    t1.SDPA_FLAG != 0 AND t1.ABONELIK_FLAG = 'N'   )
            ) AND
            T1.DCALL_DATE BETWEEN t2.START_DATE(+) AND t2.END_DATE(+)         AND

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