Genrating a stack from core dumps in unix and linux

Follow the instructions below in order:

1.      Check if you have a core file, we may find in cdump or bdump/trace or bdump or cluster log locations.

2.      Log into the user (the user need to be the owner of the core file) Then issue

               file <CORE_FILENAME>

The above output gives more info like from which executable (program) the core generated and other.

3.      Log into the user (owner of the program). Go to ORACLE_HOME/bin or GRID_HOME/bin, then issue

                file <Program>

Note: if possible give read permission to the program  (optional)

                chmod a+r <program>

Rman Connect Target Fails With ORA-06508 or RMAN-04015 or PLS-00201

Rman Connect Target Fails With ORA-06508 or RMAN-04015  or PLS-00201

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00554: initialization of internal recovery manager package failed
RMAN-04005: error from target database:
ORA-04063: package body "APPS.DBMS_BACKUP_RESTORE" has errors
ORA-06508: PL/SQL: could not find program unit being called: "APPS.DBMS_BACKUP_RESTORE"
ORA-06512: at line 1
RMAN-04015: error setting target database character set to UTF8

How to remove ^M (Control M) from the file which came from Windows

How to remove ^M (Control M) from the file which came from Windows
Use any of the beow steps.
1.
  > dos2unix <file_name>
Note: This only works when dos2unix rpm is installed

GI can be Installed on a standalone server on a server with RDBMS HOME with running DB

Can Grid Infrastructure can be installed on a standalone server that already
has RDBMS HOME with running Database?
Answer is yes

Find command usage

How to clean up data when ever disk usage exceeds the threshold limit.
Among the many ways do it, here is the simple usage of Unix find command to delete files older than a year.

find . -type f -mtime +365 -delete
Where -mtime +365 suggests to list files older than 365 days.
or
 find . -type f -atime +365 -delete
Where -atime stands for access time which is when the file was last read.

Some more examples