Oracle System Packages

DBMS_ALERT – DBMS_ALERT supports asynchronous notification of database events.

DBMS_OUTPUT – DBMS_OUTPUT package enables you to send messages from stored procedures, packages, and triggers.

UTL_FILE – UTL_FILE package is used to read and write operating system text files.

UTL_SMTP – UTL_SMTP package is designed for sending e-mails over Simple Mail Transfer Protocol (SMTP).