Oracle concepts and architecture interview questions and answers. Database datafiles control files online redo logs parameter files other database related files. Parameter files the oracle parameter file pfile or spfile holds initialization parameters which indicate where the control files are, how memory is allocated, how logging is performed, and other characteristics of the oracle instance. They are usually replicated preferably on different drives. Slave processes perform additional tasks for a background or server process the process structure varies depending on the operating system and the choice of oracle database options. Oracle database 9i, 10g, and 11g programming techniques and. An oracle database holds its data in a coordinated set of files stored on disk, including following types. For example, the simplest oracle database would have one tablespace and one datafile. Oracle database 11g the complete reference pdf book.
The databases data is collectively stored in the databases tablespaces. In earlier forms of this architecture, all components of the database were meant to work in a onetoone mapping with each other. The figure shown above details the oracle architecture. It is intended to provide a red hat oracle reference architecture that focuses on the following tasks. Ask tom displaying pdf files stored in the database. When a database is started on a database server, oracle allocates a memory area called the system global area. Its part of an oracle database its the main purpose is to recover the database its extension. Any data that belongs to an application is an example of user data. Oracle database 9i, 10g, and 11g programming techniques. Primary architecture components the figure shown above details. The below diagram shows the migration architecture using oracle data pump. The rapid oracle rac standby deployment process is designed to work with both oracle database 11g release 1 and oracle database 11g release 2.
These notes introduce the oracle server architecture. Oracle memory structures and a set of database processes constitute the oracle. An oracle database is a combination of oracle instance and data files on the file system. This document is intended to address the recommended security settings for oracle database 12c. You will learn about the various processes, memory areas, files that are involved in the architecture of oracle database. Oracle architecture interview questions and answers. Oracle database 9i, 10g, and 11g programming techniques and solutions, second edition dear reader, expert oracle database architecture, 2nd edition is a book that explores and defines the oracle database. Home interview question and answer oracle oracle concepts and architecture. Table d8 shows a hierarchical file mapping of a sample optimal flexible architecture compliant installation with two oracle home directories and two databases.
Deploying oracle database 11g r2 on red hat enterprise linux 6. Illustrates the relationships between key database structures. Oracle database administrators guide, 11g release 2 11. Every oracle database has a set of two or more online redo log files. Oracle 12c architecture oracle database internal mechanism. This course identifies the major architectural components of the oracle database.
Oracle database architecture introduction to oracle database 15. Files change tracking file d a t a b a s e a r e f a s t r e c o v e r y a r e a rman process server parameter file or imag ecopi s backup sets backup piece mml media management lay eroutin s or osb oracle secure backup shared server database resident connection pooling dedicated server lreg listener registration process automatic. There is one root container which stores the oracle supplied metadata like the plsql data dictionary packages and the common users. Deploying oracle grid infrastructure 12c release 2 deploying oracle database software 12c release 2. Oracle reference architecture that focuses on the following tasks. The final components of the oracle architecture are the physical files where our information resided on disk. If the files were on a file system, wed need to hope we could restore the database to the same poinintime that the files could also be restored to on the another file server. All books are in clear copy here, and all files are secure so dont worry about it. Oracle database architecture overview bjorn engsig bjorn. Being an oracle dba or oracle apps dba you must be knowing the basic of the database architecture. Interview questions and answers on oracle architecture. A databases data is collectively stored in the data files that constitute each tablespace of the database. Introduction oracle applications, middleware, and database software technologies operate on a wide variety of non oracle hardware platforms.
Figures shown in these notes are from oracle database concepts 11g release 2 module 1 oracle architecture objectives these notes introduce the oracle server architecture. Oracle database installation guide 11g release 1 11. The architecture includes physical components, memory components, processes, and logical structures. Structure, contents, and location of the automatic diagnostic repository. Oracle database code each user has oracle database code executing on his or her behalf that interprets and processes the applications sql statements. Database administrators web server administrators system administrators implementation specialists data center support engineers senior application.
Each user has oracle database code executing on his or her behalf that interprets and processes the applications sql statements. Oracle database 11g architecture ampersand academy. Oracle provides enterprise class performance through support for large memory, large and raw files, and grid computing. Oracle database 11g architecture on windows page 4 to innovate and leverage new windows technologies. There is one root container which stores the oracle supplied metadata like the plsql data dictionary packages and the. Oracle database 12c release 2 package requirements 3. Here is an example that loads a gif into the datbase and displays it. Part ii describes the basic structural architecture of the oracle database, including physical and logical storage structures. Explain briefly about oracle database architecture. Database files clusterware files ocrvote disk file system files. This oracle 11g training course will allow the student to gain the skills necessary for daytoday administration of an oracle database. An oracle database consists of one or more database files.
The database files are distributed across three mount points, u02, u03, and u04. This is an introductory video for the oracle database 12c posters. Oracle concepts and architecture interview questions and answers includes, physical database, structure of oracle database, components of logical database, tablespace, system tablespace, relationship among database, schema, schema objects, table, view, sequence, synonym, private. An oracle database is comprised of one or more logical storage units called tablespaces. However, only by running oracle software on oracle hardware can you take advantage of oracle s comprehensive applicationstodisk engineering, endtoend testing, and documented best practices. In a shared server architecture, each server process t hat runs database code can serve multiple. Oracle architecture explained in detailed administration i. Oracle database architecture is a combination of instance and database. Control files the control files stores important synchronization information of all files of oracle database.
Oracle database, since its inception, has always used a very specific and unique architecture which served it very well. These online redo log files, together with archived copies of redo log files, are collectively known as the redo log for the database. Through another, the dba sees the physical database files that store these logical database. Who should attend the primary audiences for this course are. These files contain data that can be accessed with the help of sql. Read online oracle database 11g the complete reference book pdf free download link book now. Oracle database 12c architecture diagram overview, this video explains some of the oracle database 12c architecture changes. Database architecture and installation overviewdescription target audience expected duration lesson objectives course number expertise level overviewdescription to understand how an oracle database functions, it is important to gain a basic understanding of its major components. Th is chapter describes tablespaces, the primary logical database structures of any oracle database, and the physical datafiles that correspond to each tablespace. Database the database refers to disk resources, and is broken into two main structures logical structures and physical structures. But from version 12c onwards, a completely new architecture has been introduced oracle multitenant. Deploying oracle grid infrastructure 12c release 2.
Datafile parameter file every running oracle database is associated with an oracle instance. An oracle database resides on disk and this is permanent. When a database is started on a database server, oracle allocates a memory area called the system global area sga and starts one or more oracle processes. Basically till 11g we used to have 1 instance for 1 database excluding rac cases for simplicity, so even you have a very small application you need to have a separate instance for that database, separate instance means memory, process and everything but then oracle was designed to. Download oracle database 11g the complete reference book pdf free download link or read online here in pdf. For example, the code for connected users can be configured for dedicated server or shared server connections.
Dec 11, 2014 these notes introduce the oracle server architecture. Getting started with oracle database 12c multitenant architecture. Reference architectures 2017 deploying oracle database 12c release 2 on red hat enterprise linux 7. Lets start the discussion with memory architecture first. For example, the simplest oracle database would have one tablespace. An oracle database consists of a database and at least one instance. In this book ive selected what i consider to be the most important oracle architecture features, and. Exploring the oracle database architecture explain the memory structures describe the process structures overview of storage structures. He is the primary internet database designer and an oracle dba at lands end in dodgeville, wisconsin. Maximize availability with oracle database 11g release 2 michal jerzy kostrzewa central and southern eastern europe database director michal. Oracle concepts and architecture interview questions and. To print this on a single page, copy the image to a word processorpresentation package and choose the fitto page option in the print dialogue. Oracle physical database structure consists of datafiles and related files.
Oracle has several types for data files, each for a different purpose. A database user runs a database application, such as a precompiler program or a database tool such as sqlplus, that issues sql statements to a database. Database the database refers to disk resources, and is broken into two main structures. An oracle database includes several different types of files. A databases data is collectively stored in the datafiles that constitute each tablespace of the database. Parse information includes the set of database operations that the sql execution mechanism will perform in order to obtain data requested by the user. Primary architecture components the figure shown above details the oracle architecture. The following information from oracle provides general guidelines for the content likely to be included on the oracle database 11g. Multitenant container database architecturea container database cdb is made up of the following containers.
Instance is a combination of memory structures and background processes which helps. Th is chapter describes tablespaces, the primary logical database structures of any oracle database, and the physical datafiles that correspond to each tablespace this chapter contains the following topics. Free oracle database tutorial oracle database architecture. Ian abramson, michael abbey, michelle malcher, michael corey in this twopart article, you take a look at the oracle schema and storage infrastructure because these are a large part of what you, as an oracle dba, will be required to manage. An instance, or database instance, is the combination of memory and processes that are a part of a running installation and a database is a set of files that store data. Sep 12, 2017 table of contents oracle enterprise manager cloud control 12c architecture how to create container db in oracle 12c how to install oracle 12c software on linux 1 of 2,965 oracle database 12c architecture part 1. Aug 12, 2016 being an oracle dba or oracle apps dba you must be knowing the basic of the database architecture. Again oracle instance is nothing but memory architecture and background processes. However, if your files are in the database and it crashes, we can recover the database which includes the files to whatever pointintime. An oracle server includes an oracle instance and an oracle database. The oracle architecture is multithreaded and includes multiple.
Let us we discuss oracle 12c architecture and explanation before you must have the knowledge on oracle 11g architecture if you have good knowledge on the oracle 11g architecture its easy to understand 12c. Writing about music is like dancing about architecture its a really stupid thing to want to do elvis costello. Bob bryla is an oracle 9i and 10g certified professional with more than 20 years of experience in database design, database application development, training, and oracle database administration. This course will help you to get a deep understanding of the fundamentals of oracle database architecture and will lay the foundation for skills on the job as a dba and also help you in taking up the dba certification.
This guide was tested against oracle database 12c installed without pluggable database support running on a windows server 2012 r2 instance as a standalone system, and running on an oracle linux 7 instance also as a standalone system. Here i have tried to explain the basic of the oracle database architecture in simple words. The architecture includes physical components, memory components, processes. It covers the innovations that improve the database for windows, but does not cover features. You would of course change the mime type and the name of the procedure from. The following picture illustrates the oracle database server architecture. Oracle concepts and architecture interview questions and answers includes, physical database, structure of oracle database, components of logical database, tablespace, system tablespace, relationship among database, schema, schema objects, table. Another database can have three tablespaces, each consisting of two datafiles for a total of six datafiles. Sure, if you have the images in a blob, its quite easy. Overview database buffer cache shared pool data dictionary cache library cache pmonsmon others server process pga archived log files user process instance reco arcn. Oracle database 11g release 2 introduces the concept of policymanaged databases using server pools, where oracle clusterware allocates and automatically reassigns capacity based on policies you define. Introduction to tablespaces, datafiles, and control files. Explore the usage of the shared pool in the oracle database architecture. Maximize availability with oracle database 11g release 2.
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