performance of a self join on oracle db -


i have self join slow on oracle db. have put indexes on fields concerned. have advice on how increase performance? 

select count(tnew.idtariffa)  cont       tariffe tatt      join tariffe tnew on tatt.idtariffa = tnew.idtariffa      (tatt.stato_attivo = 't')       , (tnew.stato_attivo = 'f')       , (tatt.validity_date < tnew.validity_date)       , (tatt.dataimport < tnew.dataimport)       , (tnew.validity_date < to_date('2017-6-26','yyyy-mm-dd'))

try push_pred hint :

select /*+ no_merge(tnew) push_pred(tnew) */ count(tnew.idtariffa)  cont       tariffe tatt      join tariffe tnew on tatt.idtariffa = tnew.idtariffa      (tatt.stato_attivo = 't')       , (tnew.stato_attivo = 'f')       , (tatt.validity_date < tnew.validity_date)       , (tatt.dataimport < tnew.dataimport)       , (tnew.validity_date < to_date('2017-6-26','yyyy-mm-dd'))

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