How to change OEM 12c Agent Port ?

Whenever we install EM agent, it will use default port at time of installation on target host. If we need to modify the port then we can follow below steps to change the port number.

Stop the EM Agent

$ $AGENT_HOME/bin/emctl stop agent

Modify the $AGENT_HOME/sysman/config/ file in the EM Agent home directory:

For example:


Modify the <port number> in the EMD_URL property so the EM Agent uses a new unused port on the target host.


Start the EM Agent.

$ $AGENT_HOME/bin/emctl start agent

Check the EM status

Exadata Patching Strategy

Let's have an overview of Exadata Machine patching.
  1. Check latest patches available on Oracle note ID - 888828.1 
  2. Download the required patches
  3. Review the patch README file
  4. Make step by step plan to apply patch for all the component
  5. Run Exachk utility before the patch application, analyse the report and correct wherever it's required.
  6. Automate the patch application process based on rolling or non-rolling method
  7. Apply the patch

Oracle Exadata Interview Questions and Answers

Get serious about your next job..!!!
                                  It's time to be well prepared..!!

Based on our experience as an interviewer and interviewee, here we have consolidated some of the generic Exadata interview questions and answers.

For more Oracle Exadata Interview Questions & Answers you can go through below link.

Exadata is pre-configured combination of hardware and software which provides a platform to run the Oracle Database. 

  • What is Cell RAM cache?
Cell RAM cache is a cache in front of the Flash Cache on storage servers and is extension of the database cache. It is faster than the Flash Cache, but has smaller capacity.

  • Who will check RAM cache before accessing a lower layer in the IO stack like flash memory or hard disk ?

  • What is adaptive scrubbing?

Oracle Exadata System Software automatically inspects and repairs hard disks periodically when the hard disks are idle. The default schedule of scrubbing is every two weeks. 

  • In event of storage server failure how RAM cache works?
In the event of storage server failure on the primary mirror, the database sends the RAM cache population to the secondary mirror, so that the blocks are now cached in the RAM cache for the secondary mirror. When the primary mirror comes back to online state, the blocks are populated back in the primary mirror’s RAM cache. 
There are multiple reason to answer this question. You can go to this link for detailed answer

  • Key components of Exadata
DB Server
Cell Storage
Infiniband Switch
Cisco Switch
Smart Scan
Smart Flash Cache
Storage Index
EHCC (Exadata Hybrid Columnar Compression)

  • Exadata Sizing