This is an Easy and Step-by-Step Guide to Install and Getting-Started on the Oracle 11g R2 Database for an Oracle Linux 6.x Systems.
To Take the Most and Best from this WowGuide your Invited to Just Relax and Take the Time to Reading, Understanding and Executing Carefully the Instructions Contained here.
To the Post Bottom you Find Links to Oracle 11g Database Detailed Troubleshooting Guides.

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After you have Access to the "Enterprise Manager" on Browser by the URL shown on the Last Screen.
On a Localhost for Example you Should Access the Enterprise Manager by the Address:
https://127.0.0.1:1158/emAnd you can Login with: User Name: SYS Password: oracleDatabasePassword From the Drop-down below Select >> Connect as SYSDBA You Should be Able to Access the Database by the Enterprise Manager!
How Managing, Start & Stop Oracle 11g R2 Database by SQLPlus Commands
SQLPlus Oracle 11g DB Quick-Start
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