Search notes:

SQL*Plus: SET SERVEROUTPUT

set serveroutput on is necessary to see the output that was written with dbms_output 
set serverout[put] {on | off} [size {n | unl[imited]}] [for[mat] {wra[pped] | wor[d_wrapped] | tru[ncated]}]

See also

outon.sql is a most simple SQL script to be put into a $SQLPATH directory. It «enables» dbms_output in SQL*Plus.
Other set variables

Index

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/developm...', 1741075828, '3.23.85.47', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/Oracle/SQL-Plus/set/serveroutput(42): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78