Traditional DBMS only serves passively after a command input by user, which can not fit the case of active service, thus ADBS comes into being.
传统DBMS只能根据用户的命令被动地为用户服务，这种特点不能适应采些需要DBMS主动服务的情况。
Traditional DBMS only serves passively after a command input by user, which can not fit the case of active service, thus ADBS comes into being.
传统DBMS只能根据用户的命令被动地为用户服务，这种特点不能适应采些需要DBMS主动服务的情况。
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