通过在存储过程中调用此存储过程来监控存储过程中所产生的错误，以便尽快解决。CREATE OR REPLACE PROCEDURE send_mail ( p_recipient IN VARCHAR2, p_message IN VARCHAR2, p_subject IN VARCHAR2 DEFAULT ''Oracle Perf Report '' || TO_CHAR (SYSDATE, ''yyyymmdd hh24:mi:ss'' ),