Sunday, January 31, 2016

USB2 for Logitech wireless keyboard/mouse

I have bought an Acer E17 laptop. Also I redecorated my study room - so I wanted to get rid of all the clutter, plus sharing the desk with my wife and use the big screen I have - which sat idle on my old desk.

So I thought to get a docking station. Just a brief check on the underside of the Acer's (I have three now) showed me that they are not in the league of grown-ups when it comes to the point of supplying docking station slots.

So I tried to use a wireless keyboard and mouse from Logitech which I bought a year ago.

However there was sometime a big lag in the keyboard and also the mouse did not react that well.

Looking on the internet I found a number of folks who complained about this but only little help in solving the problem.

Finally I stumbled over a posting that stated that USB2 would be a better choice than USB3, as this scans more devices on more frequencies. So I put the receiver in the USB2 port and since then I am a happy computer user again, not wiching to throw everything away ;-)

Sunday, October 11, 2015

Copy and Paste

I bounced into a funny thing when I setup a Data Guard Physical Standby Database.

First I prepared some database init parameters in a document (actually I reused some old documentation I had done in a previous project).


The "alter system ..." command worked like a charm.

During the preparations I needed to restart the database instance. To my surprise I received an error that there was an issue with an init parameter.

ORA-16024: parameter LOG_ARCHIVE_DEST_1 cannot be parsed

Google did not really help me. So I decided to create a pfile from the spfile and had a look into it.

There it became evident what the error was. Somehow during the copy & paste the end-of-lines were copied as well - leaving my init parameter with some newlines in it.
Made one line from it in the pfile, started the db and created a new spfile. Now it worked like a charm.

Wednesday, May 20, 2015

Strange data in Fusion Middleware Console regarding OHS

I have an OHS cluster in my environment. Due to a change I needed to bounce the servers one by one.

As this is a production environment I wanted to make sure that everything is working - so I decided to restart them one after another.

I was then looking at the performance page of the OHS and saw the following:

However in the Home section of the OHS the processes came back after a couple of minutes:

Obviously everything was running o the first host. The access_log showed the typical requests.

So I decided to restart the second server as well (proceed - fingers crossed).

When I evr find out what caused this I will update this posting.

Friday, March 13, 2015

Oracle Streams Explorer

At the recent Oracle SOA Suite community forum in Budapest I had a hands-on experience with the Oracle Streams Explorer. Having worked with the Oracle Complex Event Processing and also some hands-on exercises with the new
Oracle Event Processing, the Oracle Streams Explorer is a very easy to handle and useful addition to the area of near-real-time data insight and analysis.

The user interface comes along in the new Oracle look-and-feel. You can select a number of areas like IOT, Risk and Fraud Management, Transportation and Logistics, Customer Experience and Analysis and Telecommunications.
Within that you get a number of predefined patterns and resources. Defining your own solution can therefore be based on an existing solution in your catalog or simply by combining input streams and defining filters on them.

Now plenty of examples can (and will) be named.

The essence for me - and this is a message that I will convey to customers - is the fact that by using Oracle Streams Explorer you can get a very tangible feeling of SOA environments.
A lot of data comes along, and you might want to be alerted when a certain event occurs. For example a RFID tag of a valuable item leaving the warehouse is something you want to know right away.
Put this into an HTTP Publisher or call a REST service that in effect sends out a notification to your smartphone will be a nice goodie for any logistics company. The beauty of the Oracle Streams Explorer
is the ease with which you can build such an application.

Now I need to find more time to build such an example and document it.

Friday, October 24, 2014

I should play more lotto

Just my luck: Friday afternoon and I hit an error in the Oracle VM.
OVMRU_001020E does not show on Google or inside Oracle Support ;-)

Am I really the first to hit that problem? Seems to be an issue with the network cards in my virtual machine. I guess I will do some more reading before I can continue installing my virtual machines.

Solved it. In the view I went to the Network Ports and selected additional ports, added them to the machine and off we go.

Wednesday, October 22, 2014

A call to flushChanges on the current MDSSession does not specify the correct transaction key

Interesting issue in a SOA/BPM today.
Redeployment of the application (SOA) and restart went through without an issue.

However the stresstest came back almost immediately. The AdminServer.out showed the error "A call to flushChanges on the current MDSSession does not specify the correct transaction key". Even more astonishing was the error TNS-12516 when trying to connect to the database.

After a little bit of searching we found that the database alert log said it could not extend the SOA_INFRA tablespace.

Adapted this and everything went back to normal.

Sunday, October 05, 2014

OVMAPI_4010e during server discovery

I bounced into the problem of getting the dreaded OVMAPI_4010e error when I was discovering the Oracle VM server in my network. Metalink (MyOracleSupport for the younger ones) told me that this was typically an issue with the password of the OVM Agent.

One obscure internet blog told me however that this was due to the difference in versions. Now - it beats me how the connection information and credentials are passed differently when a new version arrives, but eventually I placed the same version of the OVM Manager as the OVM Server on my Virualbox image and it works.

OVM's strange architecture

Obviously I do not run a major Oracle-based OVM data center. So for real-life large enterprises this is not an issue.

However image the following: you have a machine on which you want to run Oracle VM Server.
Installation of the OVM is straightforward and pretty easy.

Now you end up with a piece of equipment that does exactly NOTHING.

Nothing? Yup. Well you can start it and you get a Linux prompt, and that is pretty much it.

In comes the Oracle VM Manager. It dances, it talks, it does the wash and it walks the dog - and it can be yours for 99.99$ ;-)

Seriously, in order to get anything useful to be done with the OVM Server you need the manager. Now there is a small design flaw. Setting up the OVM Manager requires an extra machine. This can be a Virtualbox image, another machine in your network or even a guest on your Oracle VM Server.

Now the last seems to be appealing. Normally in such an environment I would like to have the controlling software on the box that I control (with the option to move it elsewhere when I grow and buy  a second box).

Unfortunately before you can place an image on the OVM Server you need to configure it - meaning you install the OVM Manager on a different platform.

Seem awkward. How about an installation option that would create the Dom0 on the (first) OVM Server and that would bring a OVM Manager with it? It is not there. Pity!

So I downloaded a Virtualbox template with the OVM Manager.

This did not work. The internet told me that this was due to a mismatch of the passwords of the OVM Agent. Changed the password - no success.

Now I am in the process to create my own Virtualbox image with OEL6 and install an OVM Manager 3.3.1.

Let's see how this works out.

UPDATE: It seems to work now (see also next post).