Hidden Value details commands and procedures in MPE that can improve your productivity with 3000 systems. Send your tips to john@burke-consulting.com.

Edited by John Burke

Is there a way to see the IP address associated with a particular login?

Matthew Perdue replies:
Any user with SM can do the following, for example:


Glenn Mitchell and David Lukenbill add:
The command :listf ci.pub.sys,8 will list all sessions and will show their associated IP address.

Recently, we’re seeing UDP messages on the system console. They do not seem to affect anything, but it worries me. What can be causing this?

Guy Paul replies:
nettool.net.sys ‘res;dis;q’ will most likely have a frown :-( next to one of your Outbnd Buf Pool meaning you have hit your High Water mark. Because it is referring to UDP I would suspect your DNS lookups are failing. Increase your outbound buffers in NETXPORT.NI.niname

HP’S James Hofmeister adds:
In a case of the outbound buffer pool filling and your UDP messages, increasing the size of the pool would be treating a symptom. Does this system have the current GR patches installed? NSTHD06 for MPE/iX 7.5, NSTHD01 for 7.0, NSTHD00 for 6.5.
UDP was reworked in MPE/iX 6.5 and 7.x. To see if you have the current UDP fixes perform a “:nmmaint,3” and look for UDP versions:

6.5: NL procedure: NET_UDP_VERS Version: B06050B5
7.0: NL procedure: NET_UDP_VERS Version: B07000A8
7.5: NL procedure: NET_UDP_VERS Version: B07050A0

If your versions are less than these, then I recommend you install the General Release patches.

I have been told that chkptstat can be a cause/reason for system hesitation. While checking my system it is disabled, but I have never changed this, so I have two questions.
1) What does chkptstat do?
2) Why is the default set to disable vs enable?

Craig Lalley replies:
Chkptstat, more correctly “Enhanced chkptstat” was a way of reducing XM overhead in MPE/iX 6.0 when dealing with large files, however it does not work with Jumbo files (> 4GB). It does nothing on 6.5 and up, it is only there for compatibility.

Why am I getting this error in iSQL?

isql=> connect to ‘mursdbe’;
isql=> grant connect to mgr@mbfoster;
DDL commands disabled. (DBERR 2765)

Michael Berkowitz replies:
STOP the DBEnvironment, use the SQLUtil ALTDBE command to set the DDL Enabled flag to YES, then START the DBEnvironment and proceed with data definition.

I am removing a DTC 48. Is reboot required or can this be done dynamically?

Michael Berkowitz and Ron Horner reply:
Dynamically. However, be sure to stop the spooler on any configured printers first before you enter NMMGR. Then make your changes, validate and answer yes to do the change dynamically.

I seem to be running into a problem with the CI buffer. What is the limit?

HP’S Jeff Vance replies:
The MPE CI’s input buffer is 512 bytes, however since it appends a cr to the end of line there are 511 bytes to hold user input. CI string variable can be up to 1024 bytes in length. There is a 255-byte limit in portions of the CI that still are in compatibility mode (CM). The MYCOMMAND intrinsic restricts parameter values to be <= 255 characters, and MYCOMMAND is still called by several CI commands.

Can we do a store to the disk (STD) without any additional software purchase?

John Clogg and Christian Lheureux reply:
STD on FOS has been made available with a patch for 6.5 (sure) and 6.0 (perhaps). It’s in FOS in 7.5. I think 7.0 needs a patch too, but am not sure. Don’t count on finding it if you’re not at least on 6.0.

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