After upgrading my vCenter Server from 4.1U3 to 5.1, rollups of the performance history do not work any longer. The jobs that trigger the stored procedures "l_stats_rollup2_proc" and "l_stats_rollup3_proc" are marked as broken (I'm using Oracle 11g R1 as database with an R2 client). "l_stats_rollup1_proc" does still work, though. I have not found any usable error messages, so I have no idea if the rollup or the following purge operations are actually the problem.
Has anybody else seen this problem? Does anybody know a fix?