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Introduction and foundations

12. Multitenant Database 12c /18c

Hello everyone and welcome back. I hope that you are doing fine. In this lecture, we will talk about multitenant databases. And the concept of multitenant databases Started from Oracle 12. So we can see this concept in the oracletwelve C and letter like also 18 C. The concept is very simple. I have a big database, a root database. We call it a CDB container database. It's like a basket, only normally we don't have any user data or applications inside this database. So it is only a container. Inside this container database, I have a blogger-built built databases.So you can see blogger bill databases here. And these blogger-built databases are isolated. So, unless you have a database link, users in this blogger bill cannot see the data in the next blogger. Okay, very nice. So the person who manages the container database is called a CDB administrator, and the person who manages the blogger-based databases is called a PDB administrator. Maybe we can find one person to manage all these things. It is not a rule. Okay, so this is the simplest way to understand the multitude of databases. Okay, now the question is: what is the difference between Twelve C and the previous releases? Now let's move to the next slide. Now, before twelve, maybe I can see this scenario. I have database one connecting to a database server, database two connecting to another database server, and database three connecting to another database server. So here I have many servers, and I have many resources to manage these databases. But in Oracle 12 C and 18 C, I have the concept of a container database. And inside this container database, I have blogger-built databases, with each blogger database connecting to an application or more. This concept reduces cost because I need only one server, saving resources. Because maybe I need only one DBA to manage all these databases for easy maintenance, easy backup, and easy clinic. Because when you do, for example, a packup, you only pack up the container database. This one and this one include all the other blogger databases. Another nice thing about this concept is that we have a separation of rules: PDB admin versus CDB admin. That's it. Now let's take a very simple look at the information about multitenant databases. So I told you before that I have a root and a container. Every container database has the following containers: exactly one CDB root container called the CDB dollar sign route. So I have only one root database, a container database; this database contains metadata and common users. These data are then shared by all PDPs. Okay, that's it. So each CDB contains one root database, and also, the CDB contains a seed database called PDB dollar sign seed. And it is a template. As you can see, this is referred to as a seed bloggerbell database. We use it in order to create another bloggable database. It's like a template. Exactly. And also, we could have zero or more user-created PDBs, so that's it for the multitude architecture for the database: 12 C and 18 C I have a container,I have a seed bloggerbell databases and I could havezero or one or more blogger build databases. That's it. a very important note. Starting from version twelve C, release two, we have something called an application container, but it is out of the scope of this course. Application container is optional and I don'tsee any value or not good practiceto use the application container. Maybe some DBAs find it a good practice, but for me, I don't see a lot of benefits from the application container. Anyway, the application container seems to be a mini CDB within a CDB route. Okay? So don't worry about the application container. This is only information for you, and it's out of the scope, okay? So, just take it easy and just remember this information. Thank you for listening. I'll see you in the next video.

13. DBA Tasks and tools

Hello everyone and welcome. I hope that you are doing fine in this lecture. We will understand the database administrator's tasks and tools. First thing, let's start with some common Oracle DBA tasks. So actually, what is the DBA doing? Let's understand these tasks. First thing: installing Oracle software. Creating Oracle databases, performing upgrades of the database and software to new release levels starting and shutting down the database instance. managing the storage structures of the database like the table spaces, right? managing users and security. managing database objects such as tables, indexes, and views. Backup the database and perform a recovery operation when necessary. Also, monitoring the state of the database,monitoring and the tuning database performance. Also, reporting critical errors to Oracle support services This means sometimes, if you face errors and you can't fix them, you can open a ticket with Oracle according to the licence for your database. OK, very nice. Now let's talk about the tools for administrating the database. Actually, Ola Kelly provides us with some very nice tools in order to help you in your job as a database administrator. First thing, we have the Oracle Universal Installer, which is a tool that instals your Oracle software and options. It can automatically start the Oracle Database Configuration Assistant to install a database. So, you can see this image. This image is an image for the Oracle Universal Installer, and we will see these details when we install the Oracle software. Okay, very nice. The next tool is called Oracle Database Configuration Assistant. It's called DBCA, and its unity is that it creates a database from templates that are supplied by Oracle. You can see this screen. So you can create a database, configure an existing database, delete a database, and manage templates. So this tool is very nice for creating databases. Also, we have a database upgrade assistant, whose name is very clear: upgrade. So it's called dbua. It's a tool that guides you through the upgrade of your existing database to new Oracle database releases. Okay, very nice. Also, we have the Net Configuration Assistant. Actually, it is a treaty that enables you to configure listeners and named methods. What is the meaning of "listener"?We will understand this in detail, but the listener helpthe clients to connect to the Oracle database server. So this is the job for the listeners, which are critical components of the Oracle database network. OK, so as you can see here, this is the screen for creating listeners and naming method configuration, and we will understand this in detail. Okay, very nice. We also have a very powerful and nice tool. And most of the database administrators use this tool, called Oracle. Enterprise Manager data express It is the primary product for managing your database, and it is a web-based interface. It's called Em Express, and it's used to manage your database in a very simple way, like a simple wizard. So here you will find a Web interface. You enter the username and password, and you can find a very nice graphical interface. You can create users, you can create databases, you can assign privileges, you can monitor the database, and you can do a lot of things using a very nice Web-based interface. And also, we have the Oracle SQL Developer, and I am sure that you know about this. So the SQL developer provides another graphical user interface for accessing your database. SQL Developer supports development in both the SQL and PLSQL languages. Many people think that the SQL developer is only for developers and programmers, but actually the database administrator could get very nice benefits from this tool. And besides, we have SQL Plus, and we will see all these in practise, but it's good to know this information to make your image better, right? So thank you for listening, and I'll see you in the next video.

14. Installation Methods and OS

Hello everyone and welcome back. I hope that you are doing fine and I hopethat you are enjoying my course and I hope thatyou will give a very nice rating for this course. I know that most of the information until now has been theoretical, but we need this in order to understand the practical. Okay? Remember this information. In this lecture we will talk about installation methods and operating systems, and it's good to know about this information. Actually, we have two installation methods for the Oracle Database desktop class and server class. The desktop class is very simple and very clear. This means that you need to install an Oracle database on a laptop or desktop. So here we need a minimal configurations. That's it. But we will not go for this in our course. We will go for the server class. So this means that we will install Oracle on a server. Very nice. Now, a very important note: the server class needs advanced configuration options. Okay? So we need to access more advanced configuration options, and we will talk about this, don't worry. Now a very important note: What is the operating system for the server or the disk? It could be Windows or Linux. erver or theBut for sure, we will go for Linux because this is the most common. In order to install the Oracle database in this course, we will install Oracle VirtualBox and also install the Oracle Linux operating system on the virtual machine. And also, we will install Oracle databases 12 or 18 as a server class, and we will learn all these things; don't worry. Okay, very nice. Now a very important note on why we use the Nix. In this lecture, I will give you some simple information because maybe I need two hours to describe to you why we use the Nix. The first point is that it is free and open source. Not all Linux is free. Remember this in terms of stability, reliability, security, flexibility, and hardware support. And for sure, Linux is better than Windows for all these reasons. Now in conclusion, Linux has today become a strategic, efficient, and reliable platform for business systems at many small, medium, and large companies. And remember, a large percentage of servers powering the Internet run on Linux-based operating systems. So it's the good practise toinstall Oracle on Linux operating system. Now we must comprehend the concept of Linux distribution. So what is the Linux distribution? Simply put, it is a Linux-based operating system. Remember that Linux's operating system is free. So many companies take Linux, make some changes, and then create their own flavor. We have many distributions like Red Hat, CentOS, Fedora, and Oracle Linux, and this is the common use for running Oracle databases. We have Opanto and are manufacturing others. Okay, in this course, we will focus on Oracle Linux. So thank you for listening, and I'll see you in the next video.

Download & installing + Basic Linux commands

1. Overview about installation steps

Hello everyone and welcome back. In this course, we will talk about Oracle installation steps. in this course, and this is very important. A lot of students start downloading and installing Oracle without understanding a general overview of the installation steps. So in my opinion, you have to understand the general steps before you start downloading and installing the Oracle database. So let's start with these steps. First thing, we will download and install Oracle VirtualBox. What is the meaning of VirtualBox? Actually, it is software like any other you install on your computer. But this software allows you to create a virtual machine inside this virtual box. For example, I have a Windows operating system, but I need to learn Linux so I can install VirtualBox. Then create a virtual machine inside this VirtualBox. Then I install a Linux operating system on this virtual machine. So it's like I have another computer. And with this computer, I will do whatever I like. I will install Oracle, I will install Linux, or whatever you like. and it's very easy and efficient. Okay, so this is the virtual box. In the second step, we will download an Oracle Linux will downloSo we have to download this image. Now, after that, we will create a virtual machine in VirtualBox and install Linux. And here you should know that I have to specify how much RAM and how much hard disc I need to give the virtual machine. You are building a new computer. So this computer needs RAM and a hard disk. The minimum for Oracle Linux is 500 megabytes of free disc space. But the recommendation is 10GB because maybe you will add a lot of programmes and features. regarding the memory. You need one GB, physicalmemory, but four GB recommended. And remember that your machine should be 64-bit. Okay? If you don't have 64 bits, you cannot continue with this course. Okay? After that, we will install something called guest additions for Oracle Linux. And this is optional, actually. What is the meaning of guest additions? It is additional extension for the OS thatprovide many features like for example, copy andpaste between your original machine and virtual books. to make a shared folder, among other things So the gift additions are additional features that will make your life easy. Okay, very nice. After that, we will download Oracle Database 12 C or 18 C. But we will go for 18 C, the latest release. And we will do some prerequisite work before installing the Oracle database. And this is very important. We will talk about the prerequisites in detail. And finally, we will install Oracle's database. Remember that the minimum GB is two for the memory. And also, we need 10 GB for Oracle Database Enterprise Edition. We will download eight files total—six for the software and four for the data files. So we recommend 10GB. This means that I need around 25 to 30 GB in order to download the Oracle database. And if you like to do more features and more things like backup and recovery, maybe you will need around 100 GB. So remember this: your machine should contain a minimum of 25 to 30 GB in order to proceed with this m of 25 to 3Very nice. And also we will install other software likeputty when CP and this software will helpus to connect from client to the server. So now it's good that wetalk overview about the installation steps. Thank you for listening, and I'll see you in the next one. Video.

2. Downloading and installing Oracle Vbox

Hello everyone and welcome! In this lecture, we will download and install the Oracle Virtual Box. So we will go to Google.com. Then we will write "Oracle VirtualBox" and press Enter. You will find that here. This is the website, www.virtualbox.org. So you will click here and find it here. This is the link to download VirtualBox six dot zero.So currently, the version is six. Maybe in your case, you will find new releases or whatever. But it will be the same steps. So I will click on "Download VirtualBox Now" because I'm using a windows.So I will go and click on the Windows host. OK, very nice. I will click, and the download will start like this. Okay, that's it. So after you download, you will find this file. Okay. Now we will start to install the Oracle Virtual Box. It's very simple and easy to follow. I will make a double click. You will find a welcome page. You will click next. So the locations for the virtual books willbe on C programme files, oracle virtual books. You can change it, but I recommend you keep it the same. Click Next. Then here. Also, click "next." You will find some warnings. Also, click yes. Then click "install." Perhaps you will find some notifications. Ignore it all, okay. And just wait a little. Then click Finish, and you can see this is the Oracle Virtual Box. That's it. Okay, until the next lecture.

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