Executing prepared applications, Swap space, Ems logging – HP Integrity NonStop H-Series User Manual
Page 184
System Management
HP NonStop AutoTMF Software User’s Guide—429952-013
A-20
Executing Prepared Applications
•
A user issues a
command that causes a selected process or processes to
be traced or enter debug. Some other user starting a process may not know that
the process is being traced or debugged.
•
A user specifies DEFINEs, such as
when
executing the process; in this case, the user has control over tracing and
debugging.
The TRACE command can be secured to prevent exposure, as follows:
•
The global setting for SECURETRACE should be ON; use the
command to set the SECURETRACE setting. The SysDB should be suitably
secured to prevent unauthorized users from altering this setting.
When SECURETRACE is ON, the user who issues the TRACE command must be
the process access ID of the processes that are to perform tracing. Other
processes will run normally and will not trace or enter debug.
In development and testing systems, or systems where security is not a major
issue, you may wish to set SECURETRACE to OFF to facilitate problem analysis.
•
When a user wishes to trace DATA (that is, produce a trace in which the images of
data records accessed by the program are displayed), NonStop AutoTMF software
requires the trace file to be secured so that only the process access id of the
process may read the file. This ensures that no unauthorized person can read the
database records in the trace.
Executing Prepared Applications
Swap space
When an application process first opens a file, the NonStop AutoTMF software runtime
allocates an extended memory segment, which requires a disk swap file. Space
allocation or volume security errors may cause the allocation to fail, which will
terminate the application process.
The default location for a swap file is the volume on which the object file resides. If the
space on that volume is insufficient, the user can allocate up to four alternate swap
volumes using the global parameters SWAPVOL[0],SWAPVOL1, SWAPVOL2,
SWAPVOL3. See
on page 6-34 for details.
EMS Logging
In addition to being displayed on the home terminal of the application program, the
internal errors detected by the runtime are logged to an EMS collector. The default
collector is $0. Logging to an alternate collector can be configured using the global
parameter EMSCOLLECTOR or, if required on a process by process basis, by using a
DEFINE. See
page B-6 for details.