In order to guarantee multiple ORACLE database system initiatively, a distributed guarantee warning system is proposed based on CACTI. By using the “one-manager-multi-agent” mode, CACTI adds agent model to ORACLE database server to enable continous centralized monitoring on a distributed ORACLE database. Multi-level and flexible monitoring strategies are realized by setting different granularity on CACTI for various ORACLE databases. The system alerts abnormal states of mail and message in a database. The experimental results and the practical application in model projects verify the effectiveness of the system.