topic Re: core dump info in Operating System - HP-UX

core dump info

subrata Sur — Tue, 08 Feb 2005 09:59:06 GMT

I have a application which loads the flat table data to one oracle table . We have only exe right now . Right now it is failed giving the core dump . We get the core dump info (file attched) Can any body tell me whats wrong in the application As i caould not able to debug this core dump info .

Re: core dump info

RAC_1 — Tue, 08 Feb 2005 10:04:19 GMT

Looking at the attachment, you are 10.20
It has certain limitations on how much, stack, data and text.

What does "file core" returns??

Anil

Re: core dump info

Fred Ruffet — Tue, 08 Feb 2005 10:04:42 GMT

To have info, you can use "file" command on your system against this core file :
file core
Post the output here.

Regards,

Fred

Re: core dump info

subrata Sur — Tue, 08 Feb 2005 10:09:56 GMT

File core ruturns this info

uamtv007 $ file core
core: core file from 'fred' - received SIGSEGV

Re: core dump info

B. Hulst — Tue, 08 Feb 2005 10:15:20 GMT

Hi,

The command file on the binary that causes the fault could also be helpfull.

It could tell you if the binary is stripped or not. If not then there is debug information in the binary and sometimes you can use a debugger (gdb or dbg) to trace it.

Also running (strongly not recommended!)

#strings core > core_readable_output.log

and then view the log file...
might give you a clue. Might...

Regards,
Bob

Re: core dump info

RAC_1 — Tue, 08 Feb 2005 10:16:57 GMT

SIGSEGV is a segmentation violation. What are your values for maxssiz, maxtsiz, maxdsiz and shmmax??

Also you can get a tool shmmax and run it before and after starting the program. You might be hitting one of those limits.

Anil

Re: core dump info

subrata Sur — Wed, 09 Feb 2005 08:47:57 GMT

Thanx for the suggestion..

Can u tell me how to check that maxssiz, maxtsiz, maxdsiz and shmmax.

And also tell me how to set this this tool to check shmmax...

Also i m sending the core dump readable info ...

Re: core dump info

Dave Hutton — Wed, 09 Feb 2005 09:01:56 GMT

Easiest way on a 10.20 server is looking in sam -> kernel Configuration -> configurable parameters.

Thats the sure fire way I know of doing it. I know /stand/system will also show some values (I think they would have to of been changed from the default to show up in that file). I guess it could also have pending changes too depending on who's messing around in the files.

Re: core dump info

RAC_1 — Wed, 09 Feb 2005 11:12:18 GMT

Get shminfo from here.

ftp://contrib:9unsupp8@hprc.external.hp.com/sysadmin/programs/shminfo/shminfo

Start SAM and goto kernel configuration. There you will see configurable kernel parameters.

Anil

Re: core dump info

subrata Sur — Fri, 11 Feb 2005 16:10:45 GMT

We are providing the kernel info for checking

Re: core dump info

A. Clay Stephenson — Fri, 11 Feb 2005 16:20:27 GMT

It appears that all your tunables are at the default values.
I would set max_dbc_pct to ~ 10.
maxssiz to ~ 64MB.
maxdsiz to ~ 512MB.
maxtsiz to ~ 256MB.
shmmax to 1GB.

You really need to see the Oracle Installation instructions for your Oracle Version and OS Release and set the values according to their instructions. I'll bet that you haven't installed the Oracle reccomended patches as well. Your semaphore, shared memory, and messages values also appear to be default and they almost certainly need to be changed as well.
DO YOUR HOMEWORK when you install Oracle.

Re: core dump info

RAC_1 — Fri, 11 Feb 2005 16:26:20 GMT

Your values, maxssiz, maxtsiz, maxdsiz and shmmax are too low. Set maxtsiz,maxdsiz and shmmax to 200 mb. Set maxssiz to 100mb

And check.

Anil