Sszheng:
Your zenoss-zep database is toast. Make sure your server has enough RAM and disk space that the kernel won't OOM the mysql service and that the mysql service won't run out of space. You'll probably want to drop zenoss-zep then manually su root; $ZENHOME=/opt/zenoss; $ZENHOME/bin/zenoss_init_pre to rebuild it.
Best,
--Shane Scott (Hackman238)