Wednesday Dec 26, 2012

New Oracle Enterprise Manager 12c Book Now Available

We are pleased to announce that this new Oracle Enterprise Manager 12c book has been published and is now available, both as a printed book and as an e-book.

This is the first published EM12c book in the world.

It is a solid introduction to EM12c and is written in easy to understand English.

For further information and purchase, please go to http://www.packtpub.com/oracle-enterprise-manager-12c-cloud-control/book

Enjoy the world of Enterprise Manager!

Wednesday Dec 12, 2012

Managed servers getting down regularly by Node Manager. WAD?

Recently I have been working on a service request where several instances were running, and several technologies were being used, including SOA, BAM, BPEL and others.

At a first glance, this may seem to be a Node Manager problem. But on this situation, the problem was actually at JMS - Persistent Store level. Node Manager can automatically restart Managed Servers that have the "failed" health state, or have shut down unexpectedly due to a system crash or reboot. As a matter of fact, from the provided log files it was clear that the instance was becoming unhealthy because of a Persistent Store problem.

So finally, the problem here was not with Node Manager as it was working as designed, and the restart was being caused by the Persistent Store. After this Persistent Store problem was fixed, everything went fine.

This particular issue that I worked was on an Exalogic machine, but note that this may happen on any hardware running Weblogic.
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Principal Technical Support Engineer in the Exalogic Enterprise Support Team (EEST).

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