ERROR: OMS_HOST cannot be null. Pass OMS_HOST value either as command-line arguments or in response file

Error Description
Manual OEM agent deployment failed with following error.
[oracle@xlracnde101 agent12c]$ ./agentDeploy.sh AGENT_BASE_DIR=/u01/app/oracle/agent12c RESPONSE_FILE=/u01/app/oracle/agent12c/agent.rsp

3 Ways to Invoke / Open Vi Editor by ed Command in SQLPLUS

Generally, SQLPLUS takes the default editor by the OS. You can bypass the OS default editor using following settings. There are 3 option to set vi as the editor for the sqlplus command.
Option 1: define_editor=’vi’ - Temporary for each sqlplus session

Fix terminating the instance due to error 27625; Instance terminated by RBAL, pid = ; summary=[abnormal instance termination]

Error description
ASM instance is down with following messages in the alert.log file.
NOTE: ASMB mounting group 2 (DATA_T1)
Fri Sep 16 01:39:42 2016
WARNING: cellinit.ora is missing. RBAL is terminating the instance.
RBAL (ospid: 11489): terminating the instance due to error 27625

Silent Installation of OEM 12c agent: manually using emcli, scripts and response file

We need to install the OEM agent in the target server which we need to monitor from the OEM console. Generally, we can do this by OEM console itself. If it allows the agent installation through OEM is well and good as it is the easiest way. Sometimes we as DBA faces issues in installing the agents in the target server by the OEM console add host, target options. In such situations we can use below method to install the agent in the target server and easy we get it monitored from the OEM.  

onewaycopyAction : Source File dropdb.pl" does not exists or is not readable; Cannot copy file from 'dropdb.pl' to '/u01/app/12.1.0/grid/crs/install/dropdb.pl'

Error Description
Opatch napply failed with following error
[grid@ patch]$ /u01/app/12.1.0/grid/OPatch/opatch napply -oh /u01/app/12.1.0/grid -local /u01/installs/patch/23273629/23054327
Oracle Interim Patch Installer version 12.2.0.1.7
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