Zabbix with IBM DB2 doesn't correctly handle a long text from Windows event log.
Data type(length) "varchar(2048)" for "value" column in the history_log table causes errors like this:
2877:20140409:140311.492 IBM DB2 ERROR: [-433] 22001 [[IBM][CLI Driver][DB2/LINUX] SQL0433N Value "NOTE: Escalation cancelled: item 'Windows Application Log' d" is too long. SQLSTATE=22001]