Mega'/**/and/**/dbms_pipe.receive_message('a',2)='a

If the page takes ~2 seconds longer than usual to load, they know the DBMS_PIPE command was successfully executed.

: These are SQL comment tags used in place of spaces. Attackers use this technique to bypass Web Application Firewalls (WAFs) or filters that might block standard whitespace. MEGA'/**/and/**/DBMS_PIPE.RECEIVE_MESSAGE('a',2)='a

: This is the most effective defense. It ensures the database treats the input as data only, never as executable code. If the page takes ~2 seconds longer than