B757 FLC HAS TCASII RA ON FINAL; TAKES EVASIVE ACTION.

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LAND ON PARALLEL RWY 30R; OVERTOOK MY ACFT FROM BEHIND AND CLOSED TO WITHIN 200 FT OF US BEHIND MY R WING. WE WERE NOT ADVISED OF HIS POS BY TWR AND HE SET OFF A TCASII CLB ADVISORY AS HE MERGED ON OUR SCOPE AT 5 MI RANGE AND SUPERIMPOSED ON THE ACFT SYMBOL AND +100 FT. TCASII DIRECTED AN RA OF 1800 FPM CLB. WE HAD NO WAY TO ACQUIRE THE TFC VISUALLY SINCE HE OVERTOOK US AT HIGH SPD AND FLEW INTO A BLIND SPOT BEHIND THE R WING AND SCARED THE HELL OUT OF OUR PAX ON THE R SIDE OF COACH. DUE TO PREVIOUS EXPERIENCES AT SJC I ASSUMED THE TFC TO BE A STUDENT FROM THE L RWY 29 WHO MIGHT HAVE OVERSHOT AND BEEN ON THE OTHER TWR FREQ; WHICH MADE THIS A DIFFICULT TIME TO FOLLOW THE TCASII COMMAND; BUT I DIRECTED IT ANYWAY AND GAINED SEPARATION. WE LANDED SUCCESSFULLY DESPITE THE ABRUPT CLB AFTER CONFIRMING THE TFC'S POS. I DON'T UNDERSTAND WHY THE CESSNA WAS THAT FAST IN THE ATA AND THAT CLOSE TO US. MANY PAX WERE VISIBLY UPSET AND SHAKEN. I CALLED TWR AND MADE RECOMMENDATIONS BUT WAS TOLD THAT THE VFR TFC WAS CLRED TO DO WHAT HE DID BUT IN HINDSIGHT THEY WOULD HAVE MADE SURE WE KNEW ABOUT HIM.