{keyword}');select Dbms_pipe.receive_message(chr(107)||chr(72)||chr(88)||chr(67),5) From Dual-- | Fresh

: An Oracle subprogram typically used for communication between database sessions.

If you encountered this in a log or a search field, it is likely an automated probe by a security scanner or an attacker trying to identify vulnerabilities. CHR - Oracle Help Center : An Oracle subprogram typically used for communication

The string you provided appears to be a designed for Oracle databases. : An Oracle subprogram typically used for communication

: This is the timeout argument in seconds. If the database takes exactly 5 seconds to respond, it confirms to an attacker that the system is vulnerable to SQL injection. : An Oracle subprogram typically used for communication

: A special dummy table in Oracle used for selecting results from functions that don't belong to a specific table.