Run jobs in CRON in redhat linux

Question

I am a Novice DBA and have followed Google pages to run jobs in CRON in redhat linux  But in vain, I could Not jobs in cron.  Can any one provide me step by step config to run jobs in cron

Answer 1

Good documentation how to automate tasks using cron is indeed a bit difficult to find and much information I've seen out there on the web is incomplete. And unfortunately, it is difficult for a newbie or student to determine.
In addition to the information already provided by the previous resopnes, the product documentation is usually a good start. For example: https://linux.oracle.com/documentation/
The information about cron is in the Deployment guide, for instance chapter 20 of
https://linux.oracle.com/documentation/OL6/Red_Hat_Enterprise_Linux-6-Deployment_Guide-en-US.pdf
To my experience, many questions or problems releated to cron can be avoided if the user keeps the following in mind:
Cron does not perform a user login and only knows a minimum OS or user environment. For instance, it only knows about /usr/bin:/sbin:/bin PATH environment. If you wish to schedule a cron job using a shell command script that does anything Oracle database related, you will have to set the appropriate environment variables. Simply put the following header into your script:
ORACLE_SID=your_oracle_SID
ORAENV_ASK=NO
. oraenv -s
Also keep in mind that many programs produce output to stdout. Cron, by default, mails such output to the user account running the cron task.