Linux exit Variables

$$ = The PID number of the process executing the shell.

$? = Exit status variable.

$0 = The name of the command you used to call a program.

$1 = The first argument on the command line.

$2 = The second argument on the command line.

$n = The nth argument on the command line.

$* = All the arguments on the command line.

$# The number of command line arguments.

Find the model and serial number of a Linux server

dmidecode -t system

HTTP server process becomes swamped and does not respond to OPMN

Error: Process ping Failed: HTTP_Server`HTTP_Server~1

As per the metalink note :ID 1103744.1

The reason for issue is as below .

As the NAS mount gets busier, the HTTP server process becomes swamped and does not respond to OPMN. OPMN then restarts the process, causing all forms users connected to that Application server to fail with the FRM-92100 error.

Self service session users are much less likely to notice the issue as most self service application screens are stateless HTML, so no context is lost when the HTTP server is bounced.

But the recommended settings for the Network-attached storage (NAS) file system have not been implemented.

Solution

To implement the solution, please execute the following steps:

1:- Stop ALL middle tier services
2:- Update the $CONTEXT_FILE and change "s_lock_pid_dir" to a directory on a local disk.

For example

/d01

3:- Run autoconfig

4:- Ensure that the NAS device is configured with the correct mount options.

On Linux, it should be using "nolock" option.
On Solaris, it should be using "llock" option.

5:- Start ALL middle tier services
6:- Retest the issue.
7:- Migrate the solution as appropriate to other environments.

enjoy madi......

UID change in Linux for oracle CRS with NFS

1. stopped all the services including CRS

2. change UID using "usermod -u "

3. change user permission in NFS mount point aswell ($ORA_HOME_CRS) manually -- very important.

4. Do clean reboot(init 6), to find whether the UID changed has been success.

5. CRS service should come up automatically.

6. start the services.

list of OS running processes in windows

wmic /OUTPUT:C:\ProcessList.txt PROCESS get Caption,Commandline,Processid

Unable to find the PD KSH version in PATH

$ export KSH_VERSION='@(#)PD KSH v5.2.14 99/07/13.2'

or

export KSH_VERSION='PD KSH'

No space left on device – running out of Inodes

Be cautious before performing

1. check available disk space to ensure that you still have some

$ df -hP

Filesystem 1K-blocks Used Available Use% Mounted on

/dev/cciss/c0d0p3 4.8G 342M 4.2G 8% /

/dev/cciss/c0d0p9 7.6G 329M 6.9G 5% /opt

2. check available Inodes

$ df -iP

Filesystem Inodes IUsed IFree IUse% Mounted on

/dev/cciss/c0d0p3 1280000 1279391 0 100% /

/dev/cciss/c0d0p9 2050272 2912 2047360 1% /opt

IUse% at 100, then huge number of small files is the reason for “No space left on device” errors.

3. find those little small files as show below : from root directory

$ for i in /*; do echo $i; find $i |wc -l; done

Below command to find small files in directories .

$ for i in /home/*; do echo $i; find $i |wc -l; done

4. once you found the files like *.log, *.gz... etc

$ sudo rm -rf /home/bad_user/directory_with_lots_of_empty_files

Once delete check with df -i command again. :

Filesystem Inodes IUsed IFree IUse% Mounted on

/dev/cciss/c0d0p3 2080768 284431 1796337 14% /

/dev/cciss/c0d0p9 2050272 2912 2047360 1% /opt

If I wanted to exand inode quantity, then backup files from /storage fs and recreacte fs with additional parameter -N , which tells mkfs cmd to create desired by me inode quantity.

mkfs -t ext3 -m 1 -v -N 800000 /storage