01-21-2011
T ID KEY MODE OWNER GROUP SEGSZ
Shared Memory:
m 131 0x00000000 --rw-r----- oracle dba 2202075136
m 132 0x00000000 --rw-r----- oracle dba 2197815296
m 133 0x00000000 --rw-r----- oracle dba 1411452928
m 134 0x97604490 --rw-r----- oracle dba 16384
We just got through rebooting the server and ran another process and it is exhibiting the same behavior.
I can look into increasing the DBC but that may be difficult to get through and take some time with our change management.
What's strange is that this very process has been running fine for years. Then, within the past week, it has all of a sudden been acting strangely. I am trying to figure out what has changed but so far it appears nothing has.
Someone recommended I run truss against the process. I've never run truss before so I do not know what to expect from it but it's worth a shot.
Also, I am not certain that what I am seeing in Glance is a problem. I think it is abnormal to see a process waiting on cache but this may be absolutely normal and running the way it should based on the query. The problem could be somewhere else but I have no idea where else to look. The issue we're trying to solve is "a certain query is all of a sudden taking a long time to run".
Thanks everyone for the help so far.
---------- Post updated at 01:52 PM ---------- Previous update was at 01:41 PM ----------
Quick update: I ran the truss (HP's tusc command) and all I see is line after line of:
read *****************
lseek *****************
read *****************
lseek *****************
read *****************
lseek *****************
read *****************
lseek *****************
read *****************
lseek *****************
and on and on and on. I'm inclined to believe now that there is not anything wrong with the server but getting our DBAs to delve deeper can be quite an issue. My job is to prove that nothing is wrong with the server or else find the problem and fix it.
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KCM(8) BSD System Manager's Manual KCM(8)
NAME
kcm -- process-based credential cache for Kerberos tickets.
SYNOPSIS
kcm [--cache-name=cachename] [-c file | --config-file=file] [-g group | --group=group] [--max-request=size] [--disallow-getting-krbtgt]
[--detach] [-h | --help] [-k principal | --system-principal=principal] [-l time | --lifetime=time] [-m mode | --mode=mode]
[-n | --no-name-constraints] [-r time | --renewable-life=time] [-s path | --socket-path=path] [--door-path=path] [-S principal |
--server=principal] [-t keytab | --keytab=keytab] [-u user | --user=user] [-v | --version]
DESCRIPTION
kcm is a process based credential cache. To use it, set the KRB5CCNAME enviroment variable to 'KCM:uid' or add the stanza
[libdefaults]
default_cc_name = KCM:%{uid}
to the /etc/krb5.conf configuration file and make sure kcm is started in the system startup files.
The kcm daemon can hold the credentials for all users in the system. Access control is done with Unix-like permissions. The daemon checks
the access on all operations based on the uid and gid of the user. The tickets are renewed as long as is permitted by the KDC's policy.
The kcm daemon can also keep a SYSTEM credential that server processes can use to access services. One example of usage might be an nss_ldap
module that quickly needs to get credentials and doesn't want to renew the ticket itself.
Supported options:
--cache-name=cachename
system cache name
-c file, --config-file=file
location of config file
-g group, --group=group
system cache group
--max-request=size
max size for a kcm-request
--disallow-getting-krbtgt
disallow extracting any krbtgt from the kcm daemon.
--detach
detach from console
-h, --help
-k principal, --system-principal=principal
system principal name
-l time, --lifetime=time
lifetime of system tickets
-m mode, --mode=mode
octal mode of system cache
-n, --no-name-constraints
disable credentials cache name constraints
-r time, --renewable-life=time
renewable lifetime of system tickets
-s path, --socket-path=path
path to kcm domain socket
--door-path=path
path to kcm door socket
-S principal, --server=principal
server to get system ticket for
-t keytab, --keytab=keytab
system keytab name
-u user, --user=user
system cache owner
-v, --version
Heimdal May 29, 2005 Heimdal