FAQ

VIVEK_SHARMA wrote:

After Applying patch Kit "4" of Compaq Tru64 Unix 5.1A, about 200 concurrent defunct PIDs are spawning during a peak concurrent user load of 800 concurrent application users .

"defunct" process is generated :-
1) when doing an ordinary telnet unix login to the machine

2) when doing sqlplus /passwd@ to the database server
NOTE - NO defunct process is generated when doing direct sqlplus call to database

3) when doing application login which spawns a database connecttion thru SQL*Net
NOTE - The defunct PID Values belonging to a unix user keep Changing . Seemingly NEW defunct processes keep getting spawned as old ones die off

This is causing a severe Application performance degradation on production even though there is plenty of FREE CPU & memory available

NOTE -
1) Before application of patch kit "4", FEWER defunct processes ( 50 at max. ) used to exist
at any point in time

2) Each application user spawns approx 4 unix processes while working with the application

3) Network thruput is OK between Application & Database Server

Qs. Is spawning of defunct processes during unix login normal ?
Qs. anybody has applied Patch kit "4" on Tru64 Unix ?
Qs. Any ideas how this issue may be approached ?

Thanks
Vivek,

I have no direct experience of this patch but technically a defunct
(zombie) process is a process the parent process of which has died
unexpectedly. Normally, when a process begets another process, it is
expected to wait for a SIGCHLD signal when the child process exits. If
it crashes before the child process finishes, the child process cannot
die properly and continues to haunt the living.
Since your problem is with SQL*Net connections, the answer to your
problem is probably to be searched in the direction of tnslsnr, which
normally forks the shadow processes. The listener log may provide clues.
And a possible workaround (I would certainly try it) could be MTS.


HTH,

Stephane Faroult
Oriole Software

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grouporacle-l @
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postedMay 26, '03 at 5:26p
activeMay 26, '03 at 7:51p
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