Serba-serbi Operating System

Installing pip for Python 3 Ubuntu 18.04 ships with Python 3, as the default Python installation. Complete the following steps to install pip (pip3) for Python 3: Start by updating the package list using the following command: $ sudo apt update Use the following command to install pip for Python 3: $sudo apt install python3-pip The command above will also install all the dependencies required for building Python modules. Once the installation is complete, verify the installation by checking the pip version: $ pip3 --version The version number may vary, but it will look something like this: pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6) Installing pip for Python 2 Python 2 is not installed by default in Ubuntu 18.04. To install Python 2 and pip for Python 2, complete the following steps: Update the package index by running the following command: $ sudo apt update Install pip for Python 2 with: $ sudo apt install python-pip The command above will install Python2, Pip and all

FMW 12.2.1.3.0: "ONS configuration failed" or "oracle.ons.NoServersAvailable: Subscription time out" Solving To implement the workaround in the Configuration Wizard(config.sh) set the following environment variable before launching config.sh. $ export CONFIG_JVM_ARGS=-Doracle.jdbc.fanEnabled=false

To disable the firewall, run the following commands. # service iptables stop # chkconfig iptables off

To remove Oracle JDK, It could be done like this: Remove the link: $ sudo update-alternatives —remove "java" "/usr/lib/jvm/jdk[version]/bin/java"   $ sudo update-alternatives —remove "javac" "/usr/lib/jvm/jdk[version]/bin/javac"   $ sudo update-alternatives —remove "javaws" "/usr/lib/jvm/jdk[version]/bin/javaws" Then, remove the package in the /usr/lib/jvm: $ sudo rm -r /usr/lib/jvm/jdk[version]

After installing the Oracle 12c, I have created the new schema(s). Once I created the schema also installed the Oracle Sql Developer. I created the new connection but I am not able to connect through the Oracle sql developer. I am able to connect through sqlplus. while try to connect through the oracle sql developer am getting the error.  lo exception: The Network Adapter could not establish the connection Solution $ sudo systemctl stop  firewalld

Unicast: Say you have three servers (MS-1,MS-2,MS-3) in a cluster now if they have to communicate with each other they have to ping (i.e. heartbeats ) the cluster master for informing him that he is alive. If MS-1 is the master then MS-2 and MS-3 would send the ping to MS-1 Multicast: Here there is no cluster master each server has to ping each other to inform everyone that I am alive. So MS-1 would send the ping to MS-2 & MS-3 same way MS-2 would send the ping to MS-1 & MS-3 and MS-3 would ping MS-1 & MS-3. Thus if you see in multicast the congestion in sending the pings are more compared to unicast which makes multicast much heavier, thus WLS recommends using Unicast of less congestion in the network.