Oracle Linux

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Configuring Active- Passive Clustering Oracle Databases in Grid Infrastructure.

Introduction:

For a billing environment I have been asked to change the current Real application solution to a HA solution with an Active – Passive Database in the Cluster ware of Oracle (Grid Infrastructure) (11.2.0.2.0). Even though I have had / seen examples of this working in 11gr1 the fact we use 11Gr2 allowed us to  skip steps needed in the 11gr1 environment  (such as a dedicated virtual Ip address, able to  fail over and a listener that has to come along with that as well). This solution is based on the fact that in this project we have set up scan listener(s) and also that we connect via a Service (taf). Also it should be said that the parameters for the cluster ware have changed again between Oracle 11gr1 and 11gr2. So it was a nice challenge to see, adapt and solve the issues

It is my estimate that a maintenance window of app 1 Hour  per Database will be needed, doing the analyses,  the changes,  the removal and adding it back to the cluster and  do relocate tests.

Ps  i have marked specific  cluster commands in yellow.

Happy Reading.

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Migration to 11gr2 Cluster ware (Moving from 11.1.7 Crs to 11.2.0.3.0 Grid Infra structure)

Introduction:

Always a challenge patching a Real application cluster. My assignment,  goal in this is to bring Oracle Clusterware ( 11.1.0.7.0)  (without any PSU patches installed) to 11.2.0.3.0.  Grid Infrastructure. This will be performed in two steps , in two maintenance windows in order to minimize the change of breaching SLA of maintenance windows.

Happy reading ,

Mathijs

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Upgraders Nightmare Gridinfrastructure (1120.3.0) Install locked out all Connections

Introduction

This week I have had the challenge to finally install the Grid infrastructure Software 11.2.0.3.0 on a 4 Node production Real application cluster on Linux. I had followed all the guidelines and came well prepared because more than a month ago I had done the same on the preproduction cluster.

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A project leaders challenge: Linux Upgrade and Consequences for Grid Infrastructure

Introduction

After building the complete  Infra structure for Oracle (Grid Infra with Asm) and Rdbms in 11.2.0.2.0. version this Database Administrator is now facing a new challenge made by his Project leader. Please investigate the consequences of a  Operating  Upgrade from Red Hat Linux 5 ( 5.6) to (5.7) and change your Oracle environment to adapt to the changed Operating system. As they say often say  in the Netherlands the Customer is King  so this Admin was on his way. And of course set up a plan in which this will be done one step at the time , starting with a Test box. Because even with Kings the Dba should consider a Quote  of one of the Oracle gurus (Arup Nanda :   What’s more important guts or caution?” I would say pragmatism, bordering on caution; not guts.  And i do believe the Guru is right in this matter.

Happy reading,

Mathijs

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