Thursday, June 23, 2005

Runaway Daemon

Not another Julia movie but this is a disaster! Running MySQL 5 out of the box with default setting, this code means sudden death (both CPU and memory resources!):


DROP FUNCTION IF EXISTS runaway;

delimiter //

CREATE FUNCTION runaway () RETURNS char(255)
BEGIN
DECLARE result CHAR(255);
SET result = "";

maddy: LOOP
SET result = CONCAT(result,'a');
ITERATE maddy;
END LOOP maddy;

RETURN result;
END
//



Suggestions:
  • Implement a time-limit mechanism, which the administrator can enforce
  • Limited memory space (again, administrator enforced)
  • Comments:
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