555*DBMS_PIPE.RECEIVE_MESSAGE(CHR(99)||CHR(99)||CHR(99),15)

What you posted is Oracle PL/SQL using the DBMS_PIPE package.

• CHR(99) yields the character with code 99, which is 'c' in ASCII. So CHR(99)||CHR(99)||CHR(99) becomes 'ccc'.
• Therefore the call is trying to receive a message from the pipe named "ccc" with a timeout of 15 seconds.

Notes and a complete example:

• In many versions of Oracle, you first open the pipe, then call RECEIVE_MESSAGE to fetch the next message from the currently opened pipe. A typical complete pattern is:

  • OPEN_PIPE('ccc');
  • RECEIVE_MESSAGE(l_msg, 15);
  • (use l_msg as the received data)

• If no message arrives within 15 seconds, the call times out (the exact behavior—whether it returns an empty message or raises an exception—depends on the Oracle version).

• The snippet you posted is incomplete as shown because RECEIVE_MESSAGE usually writes the received data to an OUTPUT variable. A minimal complete version would look like:

  • DECLARE l_msg VARCHAR2(4000); BEGIN DBMS_PIPE.OPEN_PIPE('ccc'); DBMS_PIPE.RECEIVE_MESSAGE(l_msg, 15); DBMS_OUTPUT.PUT_LINE('received: ' || l_msg); END;

If you want, tell me your Oracle version and I’ll tailor the exact syntax and the expected behavior.