How to Change I/O Scheduler in Linux

Linux kernel is one of the most complicated software which is being used variety of systems such as laptops, embedded devices, hand-held devices, Database servers, supercomputers etc., All these kind of devices  demand different type of requirements. Some of the applications require fast response to user input. As you know, disk is the slowest physical […]

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Sharing Internet in Linux

Hi Folks! Today, I installed Ubuntu 18.04 LTS on my personal laptop. But I could not connect to the Internet as Ubuntu does not recognize my wireless driver. After couple of googling I have found my wireless driver .[model:Broadcom Limited BCM43142 802.11b/g/n]. But the problem is how I am going to hook-up to the Internet  […]

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Oracle EMCLI-II

In this short post, I am going to show you how to submit your Oracle jobs from the library and how to monitor your Oracle jobs from the command line. By doing that you can create your automation instead of using Oracle Enterprise Manager web interface. Before issuing any command below, first you need to […]

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Finding ORA and SP2 Errors with grep

In this short post, I will share simple grep style Regular Expression to find Oracle ORA-XXXXX and SqlPlus(SP2-XXXX) errors. Connectionless Session with sqlplus: #!/bin/bash #Set oracle environment variables in the .bash_profile . ~/.bash_profile sqlplus -s /nolog <<EOF>test.ora connect <username>/<password>@<connection identifier> SELECT ID || ‘ ‘ || NAME || ‘ ‘ || SNAME || ‘ ‘ […]

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Oracle RMAN backup through emcli

In previous post, I mentioned setting of the emcli and resolving of SSL problem. In this post, I will show you how we simply backup using RMAN through emcli. It is necessary to login  successfully to OMS to backup your database. And all necessary privileges should be given to user who logins to OMS. Creating […]

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[Solved]Connection to the current OMS could not be established

Hello Folks, The last week one of our customer wanted to automatize their Oracle backup systems. As an Oracle environment, customer has Oracle 12c. Luckily Oracle 12c designed for the Cloud. Oracle Enterprise Manager is the graphical interface for managing all of  Oracle database environment. Oracle Enterprise Manager has also command line interface which we […]

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Cheksum On Linux and Windows

Hello Folks, When you transfer files from Windows to Linux or vice versa, checksum of these files will be changed unless you transfer it in binary mode(in FTP terminology). It is normal because representation of  new line in Linux differ from the Windows system. In Unix systems new line represented by \n [line feed] whereas, […]

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Windows Server 2012 R2 hangs on the KVM hypervisor

Windows Server 2012 R2 hangs during the installation on KVM hypervisor on Ubuntu . Windows Server 2012 R2 hangs in the installation step. Version of the Virtual Host: gokay@ankara:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04.3 LTS Release: 16.04 Codename: xenial Solution:       Check your Virtual Disk Bus. And […]

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Interfacing LM35 with Atmega328P

LM35 is a precision  integrated-circuit temperature sensor. It’s output voltage linearly proportional to centigrade temperature. For example, 250 mV means 25°C. It does not require any external calibration circuitry. TheLM35 device is rated to operate over a -55°C to 150°C temperature range. In this post we will interface LM35 with Atmega328P 8-bit micro-controller.   Reference: […]

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Diskless Machine(PxE boot)

PxE is a way of booting OS kernel over the network rather than from disk. It consist of one or more PxE servers which holds all kernel and initial ramdisk image. And PxE clients which are actual host where user application and services start. It is depicted in the Figure-1. PxE server running tftp and […]

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