What is an open file? An open file may be a regular file, a directory, a block special file, a character special file, an executing text reference, a library, a stream or a network file. What is file descriptor? A file descriptor is a data structure used by a program to get a handle on […]
Interview Questions
Linux interview questions – Special permissions (SUID, SGID and sticky bit)
There are two special permissions that can be set on executable files: Set User ID (setuid) and Set Group ID (sgid). These permissions allow the file being executed to be executed with the privileges of the owner or the group. Similarly, there are two special permissions for directories: the sticky bit and the setgid bit. […]
Oracle Database interview questions – Privileges And Roles
What is a Privilege? A privilege is the right to execute a particular type of SQL statement. It can allow a user to access database objects or execute stored programs that are owned by another user or to perform system level actions. There are two types of privileges: system privileges schema object privileges What are […]
The ultimate Linux interview questions : swap
What is swap space? Swap space in Linux is used when the amount of physical memory (RAM) is full. If the system needs more memory resources and the physical memory is full, inactive pages in memory are moved to the swap space. While swap space can help machines with a small amount of RAM, it […]
The ultimate Solaris Volume Manager (SVM) interview questions
What are the configuration files used in SVM ? /etc/lvm/md.tab 1. The file is empty by default. The file is only used when metainit command is issued by the administrator. It is configured manually. 2. It can be populated by appending the output of # metastat -p. For example #metastat -p >> /etc/lvm/md.tab. 3. It […]
The ultimate Solaris zones (containers) interview questions
Basics Whats the difference between a whole root zone and a sparse root zone ? Whole root zone – Gets its own writable copy of all file systems. Thus installation takes longer time than the sparse root zone. – Also called as big zone. – Bigger disk footprint, thus consumes more disk space – To […]
The ultimate Solaris networking interview questions
Basics What are the files required for a persistent IP address configuration ? To be able to have a persistent IP address configuration across reboots, make sure you edited the mentioned file below : /etc/hostname.[interface] — Add IP address/hostname for interface /etc/netmasks — add netmasks for the networks being used to configure IP address /etc/hosts […]
The ultimate Veritas Cluster Server (VCS) interview questions
Basics What are the different service group types ? Service groups can be one of the 3 type : 1. Failover – Service group runs on one system at a time. 2. Parallel – Service group runs on multiple systems simultaneously. 3. Hybrid – Used in replicated data clusters (disaster recovery setups). SG behaves as […]
The ultimate ZFS interview questions
How to create a ZFS volume ? The command to create a ZFS volume of 1 GB is : # zfs create -V 1g geekpool/volume01 How to do a dry run before actually creating a ZFS pool ? We can simulate a ZFS operation using the -n option without actually writing to the disk devices. […]