Database: academic
Question: return me the paper after 2000 in PVLDB with the most citations .
SQL:
SELECT t2.title FROM publication AS t2 JOIN journal AS t1 ON t2.jid  =  t1.jid WHERE t1.name  =  "PVLDB" AND t2.year  >  2000 ORDER BY t2.citation_num DESC LIMIT 1;