All language subtitles for [SubtitleTools.com] Virtualization - Learning Oracle 12c [Video]

In this lesson,
we'll take a look

at Oracle offerings in
the virtualization sphere.

Virtualization is an
extremely hot topic

in enterprise IT
right now, primarily

because of its
association with what's

called Cloud architectures,
or Cloud computing.

We all hear about the Cloud,
or moving to the Cloud,

and virtualization is an
important part of that.

But it's important to understand
that virtualization has

been around for a long time.

Its beginnings go all the way
back to the days of mainframe.

And, in fact, mainframes
are still used today

and they still rely
on virtualization.

For our purposes,
virtualization is the act

of creating a
virtual resource that

could be interacted with as if
it were a physical resource.

You may have heard the phrase,
if it walks like a duck

and quacks like a
duck, it's a duck.

But this isn't true
with virtualization.

A virtual machine looks
like a physical machine

and we can interact with
it like a physical machine,

but it's not an
actual real server.

Virtualization can refer to
several computing resources

but for our purposes,
we're talking

about hardware virtualization.

We can define hardware
virtualization

in two categories--

workstation virtualization
and enterprise virtualization.

Workstation virtualization
involves a single machine.

However, on that machine,
we can run any number

of different virtual
machines, which can even run

different operating systems.

We'll revisit workstation
virtualization shortly.

The most niche and critical
type of virtualization

is enterprise virtualization.

Enterprise
virtualization involves

running many different virtual
machines across the finite set

of physical machines.

So how can this help us?

Let's look at an
example of this.

Let's say we have three physical
servers at our disposal.

This limits us to the
CPU, RAM, and disk

of these three servers.

What if we have a
need for more servers,

like a situation where we want
to run multiple application

and web servers connecting to
multiple different database

servers?

Without virtualization, we're
forced to buy and configure

more physical servers.

This isn't always cost effective
since our need is simply

more servers for separation,
not because they're maxed out

in terms of resources.

What if it were
possible to change

those three servers to look
like 50 servers or 100 servers?

That's what virtualization
enables us to do.

We use virtualization software
to make them run together

and then create multiple virtual
machines, or VMs, that share

resources across the
three physical machines.

Using this architecture, we can
create as many virtual machines

as we need, limited
only by the resources

available to those
three physical machines.

Oracle's product to accomplish
enterprise virtualization

is Oracle VM Server.

Oracle VM Server
allows us to take

multiple physical machines,
enable them to act together,

and create any number of
virtual machines, all of which

look to the user as if they
were separate physical machines.

Each has its own
virtual CPUs in memory

and each has its own virtual
disk drives, as well as

things like virtual IDs.

using Oracle VM Server
allows organizations

to use their existing
hardware configurations

more efficiently, eliminating
much of the server sprawl

that drives up the
cost of enterprise IT.

The second type
of virtualization,

workstation virtualization,
is a similar idea

on a smaller scale.

With workstation
virtualization, you

can run a number of
different operating systems

on a single hardware system.

Let's see an example of this.

The product you see here
is Oracle VirtualBox.

VirtualBox is freely available
via download from Oracle.

With VirtualBox, you can
run many different types

of operating systems,
including multiple different

distributions of Linux.

In fact, VirtualBox is probably
the most widely-used software

program to test new
operating systems.

Let's say you want
to learn Linux

but aren't sure which
distribution you can use.

Do you use Linux Mint, Red Hat?

Rather than choosing
one without testing it,

why not try it out
as a virtual machine?

So as you see here,
we have a number

of different operating systems
that are available to us.

These have all been setup
that I've setup myself.

Oracle Linux, Linux Mint,
there's a Windows XP.

This is Oracle Solaris.

So let's see what
these look like.

Here's an example of a
Windows XP virtual machine.

Everything about this and
how we interact with it

would appear to be
a physical machine.

But in fact, it's a
set of files residing

on my physical
host machine, which

is actually running Windows 7.

Here's a virtual
machine of Linux Mint.

Again, everything
about our interaction

indicates that we're
on a physical machine.

This has particular value
to us for the purposes

of learning Oracle.

You learn better
by doing, so how

do you learn Oracle Database?

You certainly have the option
of installing it on your home

machine, but what if
your home machine runs

Windows and you want to
learn Oracle on Linux?

You may not want to erase
Windows from your home machine.

Instead, why not install
VirtualBox and create a VM

for learning Oracle?

This way, anytime you
want to work with Oracle,

you just start up
your virtual machine.

When you're done, you close it.

This lets you separate out
your enterprise software

from your home
machine and allows

you to learn without the fear
of harming your home computer.