Send messages between stored procedures, packages, and triggers.
This package is especially useful for displaying PL/SQL debugging information.


 ENABLE    Enable message output. 

 DISABLE   Disable message output. 

 PUT       Place a line in the buffer.

 PUT_LINE  Place a partial line in buffer. 

 NEW_LINE  Terminate a line created with PUT. 

 GET_LINE  Retrieve one line from the buffer.

 GET_LINES Retrieve an array of lines from buffer.

dbms_output.PUT_LINE has a limit of 255 characters, to display more than this, use the alternative procedure available at René Nyffenegger's website: procedure put_line

For full documentation of the packaged procedures above see the Oracle Manual:
"Oracle9i Supplied PL/SQL Packages and Types Reference"
or the book Oracle Built in Packages by Steven Feuerstein et al

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