Oracle RAC ologgerd process high cpu load…

The ologgerd is part of Oracle Cluster Health Monitor and is used by the Oracle Support to troubleshoot RAC problems. If ologgerd process is consuming a lot of CPU and writes a lot of data to disk, it can be stopped by executing on both nodes:

# crsctl stop resource ora.crf -init

to disable ologgerd permanently, execute:

# crsctl delete resource ora.crf -init

Windows uninstall nonpresent devices…

When you want to rename a network adapter and you go “Cannot rename this connection. A connection with the name you specified already exists. Specify a different name.” You get this message for examle exwhen you changed the network card and you want to change the name of the new one to the same name the old one had.

Solution is to remove the old unused network adapter:

1.Click Start, click Run, type cmd.exe, and then press ENTER.
2.Type set devmgr_show_nonpresent_devices=1, and then press ENTER.
3.Type Start DEVMGMT.MSC, and then press ENTER.
4.Click View, and then click Show Hidden Devices.
5.Expand the Network Adapters tree.
6.Right-click the dimmed network adapter, and then click Uninstall

Nested Virtualization/Hypervisor ESXi => HyperV….

To run HyperV in ESXi modify the vmx file of the HyperV guest vm:

vhv.enable = "TRUE"
hypervisor.cpuid.v0 = "FALSE"

To allow network communication from VMs on the HyperV over the HyperV virtual switches to the ESXi network the “Promiscuous Mode” of the ESXi network switch has to be set to “Accept” – ESXi-Host => configuration => networking => select vSwitch<X> => properties => select vSwitch => Edit => Security => Policy Exceptions => Promiscuous Mode => Accept


Windows VPN connection with local default gateway…



If you have created a VPN connection then as default the network configuration will be changed so that the gateway is set to the remote network. Then you will not be able to access the local network and also you will not have access to the local internet.

This can be changed by removing the setting “Use default gateway on remote network”:vpn-gateway

Oracle 11gR2 Solaris DBConsole did not start…

On my machine the dbconsole didn’t start.

The problem was the timezone didn’t match the timezone of the machine/host.

$ORACLE_HOME/solaris_DB/sysman/config$ vi



how to recreate DBConsole & repository:


emca -deconfig dbcontrol db -repos drop

emca -repos create

emca -config dbcontrol db

WinCC OA Android App…

I now also built an Android App to visualize my Home-Automation data (powered by WinCC OA –

Because i did the same for iOS and used C# for coding (Xamarin Framework) i was able to share about 70% of the code between both Apps (iOS and Android). So there was no need to re-implement the communication and business logic!! All i had to do is to get familiar with the Android-UI…



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