Re: onunload/onload via pipe?

Richard Spitz wrote: > > Hi Informixers, > > I'm trying to copy several databases (size each ~100-200MB) from one > server to another. I thought that onunload/onload were the way to go, > since the server versions are exactly the same (IDS 7.30UC6). > > I know how to onunload to a file and onload from a file. But "ulimit" > is a problem, as is filesystem space on the receiving machine. So I'd > like to connect onunload and onload through a pipe, calling one of the > two programs via "rsh". However, I haven't found a way in the documentation > (Informix Migration Guide) to make onunload write to stdout and onload read > from stdin. Seems like they insist on a filename as parameter for the > "-t" option, and I cannot use a named pipe since the whole thing is > supposed to work over a network connection. > > Any suggestions or alternatives? Although I've never done exactly what you are trying to do, I think you are on the right lines. As you say, onunload will not talk to stdout, but needs a file. So why not create a named pipe, and stick an rsh at the other end. Then you can do exactly the same in reverse on the other machine using onload. I would be careful about the order in which you start commands. I do not trust the buffering or hand shaking capabilities of named pipes on all (well any really :) platforms. Cheers, -- Mark. +----------------------------------------------------------+-----------+ | Mark D. Stock http://www.informix.com |//////// /| | mailto:mdstock@mydas.freeserve.co.uk |///// / //| | http://www.iiug.org +-----------------------------------+//// / ///| | |What year 2000 bug? year 2000 bug? |/// / ////| | |year 2000 bug? year 2000 bug? year |// / /////| | |2000 bug? year 2000 bug? year 1900 |/ ////////| +----------------------+-----------------------------------+-----------+