My friend who had spent four months working as a BA, hated it and started applying for a new job on seek.
A week later he was called into HR office and asked if he was still interested in his current job and whether or not he was actively looking. He obviously said he was interested and not actively looking.
Two days before his probation period was over he was 'let go'. The reason being he apparently lacked motivation and wasn't a 'team player'. He was (at least he believed) harder woking than most people in his department (primarily because they were old and had been there awhile so were not as committed.)
This begs the question, how to apply for a new job while you are currently at one without your boss/manager finding out? I too am interested in finding a new job and I am currently employed. If you update your resume on Linkedin or Seek your manager can easily find out. What is the best way to avoid this without first quitting your job before looking?