Search notes:

PLW-06003: unknown inquiry directive '$$…'

The warning PLW-06003: unknown inquiry directive '$$…' occurs if the source code references a preprocessor directive whose value was not explicitly set in plsql_ccflag.
create or replace procedure tq84_proc
   authid definer
as begin

  $if $$xyz $then
      dbms_output.put_line('xyz is defined');
  $else
      dbms_output.put_line('xyz is not defined');
  $end

end tq84_proc;
/
In order to prevent this warning, $$xyz must be set to a value:
alter session set plsql_ccflags = 'xyz:true';

See also

Oracle PL/SQL: Errors and warnings

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...', 1758198906, '216.73.216.150', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/Oracle/PL-SQL/errors-warnings/PLW-06003_unknown-inquiry-directive(54): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78