A "package" is a group of features, brought together by schemas, that have a single functionality, and are used by calling from PL/pgSQL.

The following packages are supported:

• DBMS_ALERT

• DBMS_ASSERTION

• DBMS_OUTPUT

• DBMS_PIPE

• DBMS_RANDOM

• DBMS_UTILITUY

• UTL_FILE

• DBMS_SQL

To call each feature from PL/pgSQL, use the PERFORM or SELECT statement and qualify the feature name with the package name. For more information on the calling format, refer to the feature-specific description for each package.