: 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

: These CHR functions convert numeric ASCII values into characters to bypass security filters that might block specific words like "PIPE". 107 = k 72 = H 88 = X 67 = C Result: kHXC (the name of the pipe to listen to).

: This part is intended to break out of a preceding SQL string (like a search filter or input field) by closing a single quote and a parenthesis.

The string you provided appears to be a designed for Oracle databases.

: 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.

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

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

: 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

: These CHR functions convert numeric ASCII values into characters to bypass security filters that might block specific words like "PIPE". 107 = k 72 = H 88 = X 67 = C Result: kHXC (the name of the pipe to listen to). 107 = k 72 = H 88 =

: This part is intended to break out of a preceding SQL string (like a search filter or input field) by closing a single quote and a parenthesis. : This is the timeout argument in seconds

The string you provided appears to be a designed for Oracle databases.

: 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.

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