Wednesday Jul 30, 2014

Reducing Downtime While Patching Multi-OMS Environments

Enterprise Manager 12.1.0.4 has now been released for a few weeks, as well as the 12.1.0.4 OMS Bundle patches (also known as System patches). If you plan to apply these bundle patches to your 12.1.0.4 OMS, and you are concerned about the downtime, then, you can reduce the downtime by referring to this whitepaper that contains patching instructions to reduce downtime. 


This whitepaper covers various Enterprise Manager High Availability (EM HA)  usecases (level 1, 2, 3, 4), and contains instructions on how to reduce downtime while applying patches to each of these usecases. It also clearly defines the steps that require downtime and those that do not.

If you have a multi-OMS setup, you can also refer to this whitepaper which covers script creation using the opatchauto command, which automates the substeps and further reduces downtime.During our internal testing of this whitepaper on an EM HA setup, we have noticed a significant reduction in downtime. 

If your customer plans to do an Enterprise Manager Upgrade to 12.1.0.4, then as a post upgrade recommendation, they should patch their OMS with the latest bundle patches by following the instructions outlined in this whitepaper.

White paper on OTN:
http://www.oracle.com/technetwork/oem/install-upgrade/reducedowntime-patchmultioms-2251257.pdf

MOS note for the latest Bundle Patches:
Enterprise Manager 12.1.0.4.0 (PS3) Master Bundle Patch List (Doc ID 1900943.1)

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Tuesday Jan 07, 2014

Create a Database Instance without DB Control Schema

When using Database Configuration Assistant (DBCA) to create a database instance to house the repository of Enterprise Manager Cloud Control, people often end up with an instance containing DB Control schema, and they have to remove the schema from the instance before installing EM12c. To create an instance without DB Control or SYSMAN schema in the first place, make the following selections in the DBCA database creation process.


1. In the Database Template step, select the Custom Database option.



2. In the Management Options step, uncheck the Configure Enterprise Manager option.



Note: If DBCA locates an agent installation on the host, it will provide an option to register the database instance that you are creating with the corresponding Management Service. If you choose that option, DBCA will add the database instance to the Enterprise Manager site as a managed target upon completion of instance creation. This option, however, does not create SYSMAN schema in the database instance.



3. In the Database Content step, uncheck the Enterprise Manager Repository option.


Remember to make the above-mentioned selections, and you will have an instance without DB Control, which is fit for housing an EM repository.



Note: From EM12c Release 2, there is an option to create an 11.2.0.3 database instance with a pre-configured EM repository. For instructions see:

Creating a Database Instance with Preconfigured Repository Using Database Templates

Installing Oracle Database and Creating a Database


Tuesday Sep 17, 2013

Oracle Enterprise Manager 12c Upgrade sessions at Oracle OpenWorld 2013

This year @ Oracle OpenWorld 2013 we have customers Wells Fargo and Colorcon sharing their success stories and real-life lessons about upgrading to Oracle Enterprise Manager 12.1.0.x. then come join us for the below session: 

https://oracleus.activeevents.com/2013/connect/sessionDetail.ww?SESSION_ID=9588&tclass

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Thursday Aug 22, 2013

Reduce Oracle Enterprise Manager 12c Patch Set Upgrade Downtime

As Product Manager for Oracle Enterprise Manager, one question that is often being asked to me is how much is the upgrade downtime and how it can be reduced? 

One easy way to reduce the downtime while doing patch set upgrades is to perform Software only upgrade and then shutdown the existing OMS for the upgrade. This approach will not completely eliminate the downtime but reduce it to a great extent. 

When I mention patch set upgrade, we cover following upgrade paths:

a) 12.1.0.1 (with Bundle Patches 1) to 12.1.0.2/ 12.1.0.3

b) 12.1.0.2 to 12.1.0.3

Following table compares the steps required for regular installation (OUI) and software only installation.


 As you may notices from the steps listed above, regular OUI upgrade requires stopping OMS before invoking runInstaller and keeping it down until the upgrade is complete. On the other hand Software only upgrade first copies the bits and sets up the environment before stopping OMS, thus reducing the upgrade downtime.

Next comes Agent upgrade. While we recommend Agent Upgrade Console (AUC) to upgrade agents from 12.1.0.1 (with bundle patch1) /12.0.1.02 to 12.0.1.3, sometimes it’s not clear what happens during the Agent upgrade and when is the actual downtime . So here are high level steps describing the complete process: 


The actual downtime while doing the agent upgrade is on step9 where we shut down your old agent. When the agent is in blackout from step 1 to 8 it still collect’s all the monitoring data so there is no loss. 

More Information: It is recommended to go through the below checklist notes before starting your upgrade 

MOS note 1568143.1 - EM 12c R3: Checklist for Upgrading Enterprise Manager Cloud Control from Version 12.1.0.x to 12.1.0.3

MOS Note  1569883.1 EM 12c R3: Checklist for Upgrading Management Agents Version 12.1.0.x to 12.1.0.3

Collateral :

 EM 12.1.0.3 Install and Upgrade collateral page(PPT,Recorded demo,Whitepapers) on OTN:http://www.oracle.com/technetwork/oem/install-upgrade/index.html

Understanding Enterprise Manager 12.1.0.3 Upgrade and Agent Upgrades
http://www.oracle.com/technetwork/oem/install-upgrade/em-12103-upgrade-1967205.pdf

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