There could be a requirement from client to have custom device names such as /dev/asmdisk01 for an actual device with name /dev/sdb. Follow the steps outlined in this post to set custom device names using udev. In order to create customer name (/dev/asmdisk01p1) for /dev/sdb set udev rules as below: 1. Find UUID of device First, find the the UUID of the device with the scsi_id command as shown below. # /usr/lib/udev/scsi_id -g -u /dev/sdb 1IET_00020002 Save this UUID, as this ID … [Read more...] about How to set custom device names using udev in CentOS/RHEL 7
How to set custom device names using udev in CentOS/RHEL 7
Oracle database 12c : How to Drop Partition(s)
Dropping a Partition Dropping a partition will discard the rows stored in that partition as a DDL statement. This cannot be rolled back. It executes quickly and uses few system resources (Undo and Redo). You must be the owner of the table or have the DROP ANY TABLE privilege to drop a partition. You cannot drop a partition of a hash-partitioned table. You cannot drop a partition from a reference-partitioned table. If a drop partition is performed on a parent table, this operation cascades to … [Read more...] about Oracle database 12c : How to Drop Partition(s)
How to Drop/Truncate Multiple Partitions in Oracle 12C
The following are the partitioning related enhancements introduced in Oracle 12c: Online partition operations Reference partitioning enhancements Multi-partition maintenance operations Adding multiple partitions Truncating multiple partitions Merging multiple partitions Splitting into multiple partitions Dropping multiple partitions Dropping a Partition Dropping a partition will discard the rows stored in that partition as a DDL statement. This cannot be rolled back. It … [Read more...] about How to Drop/Truncate Multiple Partitions in Oracle 12C
How to Split a Partition Into Multiple Partitions in Oracle 12c
The following are the partitioning related enhancements introduced in Oracle 12c: Online partition operations Reference partitioning enhancements Multi-partition maintenance operations Adding multiple partitions Truncating multiple partitions Merging multiple partitions Splitting into multiple partitions Dropping multiple partitions Splitting Partition into multiple partitions You can split a partition into multiple partitions. In previous releases, you were able to split … [Read more...] about How to Split a Partition Into Multiple Partitions in Oracle 12c
How to Merge Multiple Partitions in Oracle 12c
The following are the partitioning related enhancements introduced in Oracle 12c: Online partition operations Reference partitioning enhancements Multi-partition maintenance operations Adding multiple partitions Truncating multiple partitions Merging multiple partitions Splitting into multiple partitions Dropping multiple partitions Merging multiple partitions In Oracle 11g, you can merge the content of two partitions only in single DDL. However, in Oracle 12c, you can merge … [Read more...] about How to Merge Multiple Partitions in Oracle 12c
How to use wget to download file via proxy
The wget program allows you to download files from URLs. Although it can do a lot, the simplest form of the command is: wget [some URL]. Assuming no errors, it will place that file in the current directory. If you do not specify a filename, by default it will attempt to get the index.html file. This document descript how to set wget (The non-interactive network downloader) to download file via proxy. wget Configuration files Below are wget configuration files listed by their … [Read more...] about How to use wget to download file via proxy
How to change the default permissions of log files created by rsyslog
The ask The user wants to change the default permissions of the log file /var/log/messages to make it world-writeable. How can this be done using rsyslog? The Solution The /etc/syslog.conf file is the configuration file for the syslogd daemon that tells the daemon where to send the log entries it receives. $FileCreateMode and $umask are the two relevant directives defined the the sryslog configuration file that can be utilized as many times as needed to configure permissions on … [Read more...] about How to change the default permissions of log files created by rsyslog
Linux Command line Basics – Working with Files and Directories
This post explains how to work with files and directories. This includes tasks, such as locating your position in the directory structure, viewing file contents, copying and moving files and directories, creating and removing files and directories, and searching for files and directories. Viewing Directories A directory is a list of references to objects, which can include files, subdirectories, and symbolic links. Each reference consists of two components: A name: The name of the object … [Read more...] about Linux Command line Basics – Working with Files and Directories
Solaris Volume Manager (SVM) : How to Use Mirrors to Roll Back System Changes
There are many circumstances where major changes are being made to the system, such as a patchset install or OS upgrade, when it would be nice to have the option to undo those changes and revert to a previous system state in case something goes wrong. With software volume management and a little preparation, it is possible to keep a temporary copy of the boot disk and roll back to it if needed. The boot disk needs to be mirrored. SVM root encapsulation and mirroring [SPARC] In the … [Read more...] about Solaris Volume Manager (SVM) : How to Use Mirrors to Roll Back System Changes
Linux Command line Basics – Executing commands from the command line
You can use system commands on the command line to instruct the system to perform specific tasks. The commands are received into a terminal window. This post is a very basic introduction to using commands with options and/or arguments and also how to run multiple commands on the command line. Note: UNIX commands are case-sensitive. Command-Line Syntax - The command syntax is the structure and order of the command components: name, options, and arguments. - Command-line commands can … [Read more...] about Linux Command line Basics – Executing commands from the command line