"Changing data structure forced command termination."

Hi All. My client site has IDS Workgroups 7.30.UC9, and we're on HP-UX 11.0, and the server is an R390. The drama I am talking about happened when I was on holidays for 2 weeks, so I apologise if the details are a bit scant. The server "hung" on a couple of occasions with hardware related problems (motherboard/memory), so the database server was "ungracefully" shut down, on at least two occasions I can think of. An oncheck by an external consultant on Fri. 7/1/00 did not reveal any problems viz data corruption. Two residual problems. (1). OLTP performance is fine. But running certain reports brings the database server literally to its knees. This was not happening before these episodes. (2). This is more the issue. The error message in the title of this mail happens when running "onstat -u", "onstat -k", "onstat -x", to name but a few - these commands are partially executed before this error message appears. "onstat -g seg" and "onstat -g glo" are okay. This happens irrespective of whether shared memory or TCP/IP is used for the connection. I can't find anything in the obvious files (eg. online.log) to give me any clues. My questions. (1). Does anyone have any suggestions as a "first port of call" to try. (2). Are there any files anyone would like to see? Regards, Alnis Bajars. alnisb@colorcorp.com.au