FMW rolling patches

[satish]

Dear Erman,

can we apply patches that are classified as FMW_ROLLING_ORACLE_HOME with 0 disruption?

lets suppose,we have cluster with 2 managed servers on 2 nodes

To apply the patch:

Bring down Managed Server1
Apply the patch to the Oracle Home that Managed Server1 is running from.
Restart Managed Server1

Bring down Managed Server2
Apply the patch to the Oracle Home that Managed Server2 is running from.
Restart Managed Server2

Here,when we bring down Managed Server1,the transactions that are being processes by it will fail right?

Thank you,
satish

[ErmanArslansOracleBlog]

When a managed server is down, the transactions in progress during failure of that anaged server will be lost.
However; users sessions will be re-established and migrated to another managed server in the cluster.

As for the near-zero downtime patching, what I recommend you is to use the online patching.
Online patching can even be used for FMW..

I mean patch the patch filesystems and then take them into production during cutover..

EBSapps.env run
adop phase=prepare
. EBSapps.env patch
Change the directory where the bsu.sh resides using a command like cd $FMW_ HOME/utils/bsu.    
Execute the bsu script using the command . /bsu.sh
adop phase=finalize
adop phase=cutover
adop phase=cleanup

AS for your rolling patching related question, yeah, if the patch in question is a Zero Downtime Patch, then my answer is yes.

A Zero Downtime Patch is identifiable by the instructions in the patch's README file. The README should say something like : "This patch has been marked as eligible for Zero Downtime Patching. The type of Zero Downtime Patching supported by this patch is FMW_ROLLING_ORACLE_HOME"


Ref: Introduction to Zero Downtime (ZDT) Patching for Oracle Fusion Middleware / WebLogic Server (Doc ID 1942159.1)