What standard Oracle system packages have you used in your work?

In working with Oracle, standard system packages are often used, which provide useful functions and procedures for various tasks. Here are some of them:

• DBMS_SCHEDULER — managing the job scheduler.
• DBMS_OUTPUT — outputting debug information.
• DBMS_SQL — dynamic SQL execution.
• UTL_FILE — working with files on the database server.
• DBMS_LOB — operations with LOBs (Large Objects).
• DBMS_STATS — collecting statistics for the optimizer.
• DBMS_LOCK — managing locks.
• DBMS_ALERT — asynchronous notifications.
• DBMS_PIPE — inter-process communication.

Depending on the tasks, for example, DBMS_SCHEDULER is often used for automation, DBMS_OUTPUT for logging, and UTL_FILE for working with files.

It is important to understand that these packages are built into Oracle and allow extending functionality without writing external programs.