Top 30 Linux System Administrator Interview Questions & Answers

 Q:1 Why LVM is required? Ans: LVM stands for Logical Volume Manager, to resize filesystem’s size online we required LVM partition in Linux. The size of LVM partition can be extended and reduced using the lvextend & lvreduce commands respectively. Q:2 How To check Memory stats and CPU stats? Ans:  …

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Linux Interview Questions Part-1

1. How will you abort a shell script before it is successfully executed? Answer : We need to use ‘exit’ command to fulfil the above described situation. A ‘exit’ command when forced to output any value other than 0 (zero), the script will throw an error and will abort. The …

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How to Clear RAM Memory Cache, Buffer and Swap Space on Linux

Like any other operating system, Linux has implemented a memory management efficiently and even more than that. But if any process is eating away your memory and you want to clear it, Linux provides a way to flush or clear ram cache. How to Clear Cache in Linux? Every Linux …

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ORA-54002 when trying to create Virtual Column using REGEXP_REPLACE on Oracle 12cR2

I encountered an issue today trying to create a table in an Oracle 12cR2 database, the DDL for which, I extracted from an Oracle 11gR2 database. The error returned when trying to create the table was: ORA-54002: only pure functions can be specified in a virtual column expression The definition of …

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Step by Step Installing Oracle Linux 6.7 on Virtualbox

Tutorial Target Step by Step Installing Oracle Linux 6.7 on Virtualbox Version / Date 1.0 / Jan-2017 Required Software • Virtual Software like Oracle VirtualBox or VMWare Workstation. This tutorial tested on Oracle VirtualBox 5.0.12 • Oracle Linux 6 Installation Media. This tutorial was performed on Oracle Linux 6.7 Required …

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Installation Oracle Database 12C Release 2 (12.2) on Oracle Linux 6 (OEL6) and 7(OEL7)

This article describes the installation of Oracle Database 12c Release 2 (12.2) 64-bit on Oracle Linux 6 (OL6) and 7 (OL7) 64-bit. The article is based on a server installation with a minimum of 2G swap and secure Linux set to permissive. An example of this type of Linux installation can be seen here

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