Question

I have a table with more than 10 000 000 rows.
In TOAD this query works very well on it:

select /*+ INDEX(x IDX_CASHFLOW_COMPLEX)*/ * 
from MYPR.CASHFLOW x 
where fk_debet in (21856, 21854, 21855)

IDX_CASHFLOW_COMPLEX is index on 5 columns created by following script:

CREATE INDEX MYPR.IDX_CASHFLOW_COMPLEX ON MYPR.CASHFLOW
(FK_DEBIT, FK_CREDIT, FK_DOCUMENT, PAYMENTDATE, FK_PAYMENTCODE)
LOGGING
TABLESPACE INDX
PCTFREE    10
INITRANS   2
MAXTRANS   255
STORAGE    (
            INITIAL          64K
            MINEXTENTS       1
            MAXEXTENTS       UNLIMITED
            PCTINCREASE      0
            BUFFER_POOL      DEFAULT
           )
NOPARALLEL;

Similar query but without Oracle hint syntax works significantly slower!

Would you please suggest is it possible to tell NHibernate to add Oracle hint in the query?

Thanks!

Answer 1

Are your optimizer statistics up to date? If not you may find that once they are generated you don’t need the hint at all.