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Checking System Resources with sar

rhel-7

The System Activity Reporter (sar) is one of the oldest system monitoring facilities created for early UNIX systems—predating Linux by a few decades. The sar command itself can display system activity continuously, at set intervals (every second or two), and display it on the screen. It can also display system activity data that was gathered earlier.The sar command is part of the sysstat package. By installing sysstat and enabling the sysstat service, your system immediately begins gathering system activity data

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Managing RPM Packages with YUM in Linux

rhel-7

The Yellowdog Updater Modified (YUM) project set out to solve the headache of managing dependencies with RPM packages. Its major contribution was to stop thinking about RPM packages as individual components and think of them as parts of larger software repositories. With repositories, the problem of dealing with dependencies fell not to the person who installed the software, but to the Linux distribution or third-party software distributor that makes the software available. So, for example, it would be up to

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The Remote Tools: WinRM and WinRS Windows Server 2012 r2

windows_server2012

It’s the case all too often that new operating systems include some really important and useful features that go largely unnoticed. Windows Server 2012 R2 contains one of those neat but largely unknown features in a new network protocol called Windows Remote Management (WinRM). To understand why WinRM is a great feature, let’s consider what WinRM is intended to replace: a protocol known as the Remote Procedure Call (RPC). Even if you’ve never heard of RPC, chances are that you’ve

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Oracle Memory Parameters

oracle

Oracle Memory Parameters With Oracle Database 11g’s Automatic Shared Memory Management (ASMM) feature, the management of Oracle’s various memory parameters has essentially come down to setting one parameter. And if there were no more 9i or 10g databases out there, or if all applications used memory in the optimal way, memory management would be simple. However, just as some SQL Server 2000 and 2005 servers are still in use, earlier versions of Oracle remain in service. So, you do need

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Creating LVM logical volumes

lvm-logical-volume-manager-in-linux

LVM logical volumes are used from the top down, but they are created from the bottom up. First you create one or more physical volumes (pv), use the physical volumes to create volume groups (vg), and then create logical volumes from thevolume groups (lv). Commands for working with each LVM component begin with the letters pv, vg, and lv. For example, pvdisplay shows physical volumes, vgdisplay shows volume groups, and lvdisplay shows logical volumes. The following procedure takes you through

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Hyper-V in Server 2012

windows-server-2012-hyper-v

Server virtualization—breaking one physical server up into a bunch of virtual machines—is one of the most significant changes in server management in the past 10 years. We wrote “server management” in lowercase because it’s used not just in Windows Server but in various flavors of Linux, Unix, Sun Solaris, and so on. Being able to buy one big, powerful, reliable piece of hardware and fool it into believing that it’s actually 10 or 20 smaller separate pieces of computer hardware

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Windows Server 2012 Editions

windows_server2012

Windows Server Editions When Windows Server 2012 was released, you had the choice between Standard and Datacenter editions in both the Server Core and GUI versions. With the release of Windows Server 2012 R2, you have two more editions to choose from: Foundation and Essentials. Not only does each version have different features, but the price for each license reflects each version’s features. Let’s discuss the differences among all the editions. Standard Edition This is the enterprise-class cloud server and

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Adding user in Linux (useradd)

rhel-7

Sometimes, a Linux system doesn’t have a desktop available to use the User Manager window. Other times, you might find it more convenient to add lots of users at once with a shell script or change user account features that are not available from the Users window. For those cases, commands are available to enable you to add and modify user accounts from the command line. The most straightforward method for creating a new user from the shell is the

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Linux Directory Structure

rhel-7

The Linux fi lesystem is organized as a hierarchy of directories. Some of the important Linux directories are: ■ /bin—Contains common Linux user commands, such as ls, sort, date, and chmod. ■ /boot—Has the bootable Linux kernel and boot loader configuration files (GRUB). ■ /dev—Contains files representing access points to devices on your systems. These include terminal devices (tty*), floppy disks (fd*), hard disks (hd* or sd*), RAM (ram*), and CD-ROM (cd*). Users can access these devices directly through these device files;

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SGA: System Global Area in Oracle

oracle-12c

System Global Area The System Global Area (SGA) is typically a very large memory area shared by all Oracle processes. It is divided into distinct areas such as the buffer cache, the shared pool, and the log buffer, whose sizes are specified in the database configuration file (pfile or spfile). The various Oracle processes coordinate their access to these areas by using an interprocess communication (IPC) mechanisms called latches. Buffer Cache Typically, the buffer cache is the largest portion of

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