AbstractIn this series of articles we are exploring some of the lesser known, but still useful, commands hidden away in your Informix bin directory. The article explores the onclean utility. It’s often necessary to run more than one database instance on a single server. While this is a useful feature and quite easy to do with IDS, when things go wrong, it’s not always straightforward to tie each oninit binary back to a particular instance, and killing the wrong binary or shared memory segment can be disastrous. Since IDS 11, the onclean utility has been bundled with the server; this useful little program can help take some of the pain out of cleaning up an instance that has not shut down properly, killing only the relevant server processes, and dropping any attached shared memory segments.