Little things worth knowing: Executing RDA on RAC

Result! I have finally been able to gather a complete RDA (Oracle Remote Diagnostic Agent) output on my 2 node RAC system. After consulting the relevant documentation on MOS-which is spread over at least 42 Doc IDs-I found them not to be very helpful to the degree that some of what I read is actually wrong or contradicting. I put together a short note, primarily to myself, to remind me of the process. I hope you find it useful, (more...)

UKOUG 2-Stream London SIG

ukoug_logoWe not have the agenda online for the UKOUG 2-stream London SIG, due to take place on 23rd February. There will be an RDBMS Stream and a RAC, Cloud, Infrastructure and Availability Stream.

Mark Rittman will be giving us a keynote talk, with an emphasis on kettles or eating dinner in the dark or the Hadoop cluster in his garage something.

There are some really cool other speakers too, from Oracle, Leading Consultancies and the (more...)

Creating a RAC cluster using Ansible (part 2)

In my previous 2 blogposts i explained how to setup a Vagrantfile that deploys 2 virtualbox machines that can be used as a basis for a RAC cluster and how you could use Ansible to deploy RAC on those VM’s. In this post i want to dive a bit deeper into how i setup Ansible and why, keep in mind that this just one way of doing this.

The Github repository containing all the files (more...)

Creating a RAC 12.1 Data Guard Physical Standby environment (1)

I have just realised that the number of posts about RAC 12c Release 1 on this blog is rather too small. And since I’m a great fan of RAC this has to change :) In this mini-series I am going to share my notes about creating a Data Guard setup on my 2 node RAC primary + identical 2 node RAC standby system in the lab.

NOTE: As always, (more...)

Call for Papers – UKOUG 2017 SIGs


The time has come for me to plan the upcoming 2017 UKOUG Special Interest Groups.

I am chairman of the RAC, Cloud, Infrastructure and Availability (RAC-CIA) SIG and I’m after presentations for the 3 joint SIGs we will be putting on with the RDBMS SIG, plus the stand-alone SIG will we will having in the autumn.

A SIG is a single day one-or-two stream conference which we take around the UK to make it (more...)

reinstall tfactl after GI Upgrade

| Oct 19, 2016


Recently I finished a Grid Upgrade from to + PSU JUL 2016. So far so good during a check I saw that the old tfactl tool under Software Release where up and running.

That could not be okay.  So I start an Uninstall and Setup for Release

What steps has to be done?

Check the actual tfactl installation

 /u01/app/grid/tfa/bin/tfactl  (more...), failed and IB listener

So this customer has an Exadata quarter rack and they have an IB listener configured on both DB nodes (for DB connections from a multi-racked Exalogic system). We were adding a new DB node to this rack. So just followed the standard procedure of creating users, directories etc on the new node, setting up ssh equivalence and running All went fine but failed. Little looking into the logs revealed that it (more...)

Grid Infrastructure 12c installation fails because of 255 in the subnet ID

I was doing another GI cluster installation last month when I got really weird error.

While was running on the first node I got the following error:

2016/07/01 15:02:10 CLSRSC-343: Successfully started Oracle Clusterware stack
2016/07/01 15:02:23 CLSRSC-180: An error occurred while executing the command '/ocw/grid/bin/oifcfg setif -global eth0/ eth1/' (error code 1)
2016/07/01 15:02:24 CLSRSC-287: FirstNode configuration failed
Died at /ocw/grid/crs/install/  (more...)

SCAN Listener Crash After Applying July 2016 PSU

I ran in to a small issue while applying the July 2016 quarterly patch to a couple of Exadata racks last week.  The systems were running GI, previously with the January 2016 PSU.  The patches applied successfully, and we were beginning the process of running the post-patch scripts on the databases in the cluster.  This process involves manually starting the database in upgrade mode, and we saw a message in SQL*Plus that the (more...)

12cR1 RAC Installation on OEL7

To build Oracle Clusterware Database at Home, I believe , RAC ATTACK is the best place to learn. Its is a free curriculum and platform for hands-on learning labs related to Oracle RAC. While reviewing the article, I thought to perform 12cR1 RAC installation on OEL 7.2.

Attached is the document :- 12c_RAC_on_OEL7

The attached article is inspired by


Tim Hall’s article :- 

Deploying Oracle RAC (more...)

When should you use Oracle RAC?

Over the past years we've worked on many Oracle projects, some with RAC, some without, some which intended to implement RAC and failed, and some which implemented poorly and ripped it out at the last minute. 

For those new to Oracle, RAC is the Real Application Cluster option for the database which lets you cluster the database servers. The main reason for using for RAC is that it brings resilience to a system, it (more...)

Configuring VNCR for Oracle RAC

By default on an Oracle RAC installation, the listeners are configured to allow any database to register with them.  There is no security out of the box to determine which databases may register.  While this makes it easy to create new databases without worrying about listener registration, this can cause potential problems in a real environment.

This can be dangerous working with RAC environments where the database registers with both a local and remote listener.  The (more...)

Review: Oracle RAC Performance Tuning

Some time ago, I received a free review copy of Brian Peasland‘s recent book, Oracle RAC Performance Tuning.

First, a note on my RAC background: I spent 7 years on Oracle’s RAC Support team. When customers had an intractable RAC performance issue, I was on the other end of the “HELP!” line until it was resolved.

I made Brian’s acquaintance through the MOS RAC Support forum, where Brian stood out as a frequent (more...)

HAIP and Exadata

If you’ve run an exachk report, y0u may have seen the following message with regard to your databases:

Status Type Message Status On Details
FAIL Database Check Database parameter CLUSTER_INTERCONNECTS is NOT set to the recommended value db01:dbm011, db02:dbm012 View

This check is commonly seen when a database is created on Exadata without using the custom “Exadata” templates included with the database creation assistant.  These customized templates include a multitude of recommended parameter settings found in (more...)

Rolling Out-of-Place patching para Oracle Grid Infrastructure 12c y 11gR2: clonación en esteroides

Mi artículo más reciente para ToadWorld, dentro de una serie dedicada a aplicar patches con mínima suspensión del servicio. Ahora detallando cómo aplicar patches a Grid Infrastructure usando un Golden Image.

Convert 12cR1 non-RAC database to RAC database using rconfig

I have recently configured Active/Passive Failover cluster using Grid Infrastructure 12cR1 and wrote document on that subject. Now I plan to use this environment and convert "test12" database from Single-Instance to RAC database.

There are several ways to convert non-RAC database to RAC database:
- using Database Configuration Assistant (DBCA)
- Oracle Enterprise Manager
- rconfig command line utility
- manually

In this post I will describe how to perform conversion using rconfig utility.

Before (more...)

12c Improvement in Database Service Management

Removing a service via srvctl has not historically resulted in the service being fully removed from the database and it would still be visible in DBA_SERVICES as show below in an database:

Create the service:

$ srvctl add service -d orcl -s demo -r "ORCL1,ORCL2"

Have (more...)

Oracle SOA Suite 11g tuning tips for Oracle RAC database 11.2

During my project work I had to tune the SOA dehydration store on more than one occasion. Through this posting I would like to share the tuning tips collected during these exercises. It is not a step-by-step guide, because with tuning there never is a 'one-size-fits-all' in my humble opinion, but I provide in general a guidance that you can use as a reference for your own situation. I will also refer to related Oracle (more...)

MGMTDB: Grid Infrastructure Management Repository

Original Post can be viewed at MGMTDB: Grid Infrastructure Management Repository

MGMTDB is new database instance which is used for storing Cluster Health Monitor (CHM) data. In 11g this was being stored in berkley database but starting Oracle database 12c it is configured as  Oracle Database Instance. In 11g, .bdb files (more...)

Openfiler on Virtualbox and 12c Oracle Flex ASM

Original Post can be viewed at Openfiler on Virtualbox and 12c Oracle Flex ASM

Last week Oracle released 12c database and Oracle blogosphere is bustling with lot of people posting details about new versions and setup. I too decided to take plunge and setup my own RAC cluster. I had (more...)