Oracle Questions And Answers Pdf

oracle questions and answers pdf

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Oracle Concepts and Architecture Interview Questions and Answers

There are a lot of opportunities from many reputed companies in the world. According to research, Oracle DBA has a market share of about 0. This course will help you to achieve excellence in this domain. Oracle automatically maintains and uses indexes and when any change is made in the table data Oracle automatically distributes it into relevant indexes. Oracle usually publishes a major release once a 4 year.

This digit is usually followed by a character describing the nature of the release. For example: 9i internet , 10g grid , 11g grid , 12c cloud. Oracle publishes the major release as maintenance release 1 and then usually publishes a second maintenance release during the lifetime of the software. New features are added to database Software with maintenance releases. This will be o for database software. Patch set updates are published 4 times a year by Oracle and as you apply them to your database software, this fourth digit advances.

A synonym is an identifier that can be used to reference another database object in a SQL statement. The types of database objects for which a synonym may be created are a table, view, sequence, or another synonym. Passwords for database users are stored in the data dictionary of the database. When a user wants to log into the database, the username and password provided by the user are checked against the values stored in the database. If the username and password match, the user is granted access to the database.

The data dictionary is part of the database and it will be accessible as long as the database is open. The passwords for administrators are stored in the dictionary as well. When the database is closed, the data dictionary will be inaccessible. A password file is a separate operating system file that is stored on a disk outside of the database. Administrators who have those privileges are authenticated using this password file even when the database is down.

This may involve installing and configuring a database from scratch. On a running system, the DBA will be the only privileged person who can shut down and startup the database. The DBA will create new users and manage the privileges of each user. He will take regular backups to ensure that data is safe. In case of a disaster, he will be responsible for restoring the database from backups. He will have to do monitor the space usage and do capacity planning for the database.

He will be responsible for enforcing security policies. He will have to monitor database activities. He will have to tune the database so that it works at an acceptable speed. He is expected to follow the latest patches and apply them when applicable. An Oracle developer is mainly responsible for developing backend applications. They do data modeling according to business rules. The design tables, create indexes and other types of constraints.

They develop procedures using this language. However, the Oracle developers are not expected to administer the database software itself. DBAs are not primarily assigned to develop code. According to the structure of the organization, DBAs might also be assigned development tasks or at least assist the developers where necessary.

If you are going to do batch installations, it is best to do it with Oracle Universal Installer in silent mode. For single installations. However, in batch installations, this will take longer. A response file is a plain text file, where options to create a database are stored. It is possible to create it manually from scratch but that would take longer and would be erroneous. Installation media comes with a template response file. It is rather easier to customize it manually. This file also contains notes about the parameters.

However, the easiest and most reliable way to create a response file is by using Oracle Universal Installer. It is also possible to create a database via an SQL script. In this script I would specify:. The system global area is a shared memory, which means it can be accessed by multiple processes. This holds data that is required by the instance to operate. The background processes are operating system processes and each process has a specific responsibility in the instance.

An Oracle database resides on disk and this is permanent. It is composed of files that are stored on a disk. These files can be categorized into three types:. You can start up a database with three tools. A parameter file holds instance parameters that govern how an instance operates. In order to start up an instance, Oracle needs to locate this file. SID- is the service identifier of the instance.

This is again a server parameter file. If Oracle cannot find the two files listed above, it will search for this file. This is the last location to search. You can start up a database with the modes below:. Even if the database is idle, there is no guarantee that the database will not write anything to files during the snapshot.

In the default configuration, the Oracle database will not automatically start after the server reboots. There are two methods to accomplish this:. When a user connects to a database, he sends SQL queries to the database to execute. In shared server architecture, the total memory consumption will be less.

However, certain operations like DBA activities can only be performed on a dedicated server. The shared server process monitors the request queue. When they find an incoming request, they execute this SQL query and place the results in the response queue. The request queue and the response queue reside in the system global area. The dispatcher processes also monitor the response queue. When it receives a result, they deliver the result to the relevant client. In this architecture, there will be multiple shared server processes and dispatcher processes.

There can be multiple database background processes. When a server process wants to update a data block, it reads the block from disk to buffer cache if the block is not already in the cache and then updates the copy in the cache.

We can make use of one or more rows in order to make the index. The index can increase the performance of retrieval and slows down the performance of insertion. The table is the first level of the physical unit in the database. Oracle uses tables of a database to store data into rows and columns. Views are read-only as well as read-write. The tablespace is a Logical Storage Unit used to group related logical structures together.

It is the logical structure where all the objects of the database will be grouped. It also contains the data dictionary table for the whole data. Each tablespace is divided into one or more data files and one and more tablespace s are created for each database. Materialized views are objects that have reduced sets of information that have been summarized, grouped, or aggregated from base tables.

They are typically used in data warehouses or decision support systems. Synonym types are private and public. A public synonym does not belong to any schema.

In other words, when any database user can access it, it is called a public synonym. A private synonym is one that does belong to a specific schema. In other words, when only the owner can access it, it is called a private synonym. A sequence generates a serial list of unique numbers for numerical columns of database tables.

We can use the sequence on columns for data where we want to insert data in a sequential manner. A database link is a schema object in one database to access objects in another database. When you create a database link with a Public clause it is available for access to all the users. Row Chaining occurs when the row is too large to fit into one data block when it is first inserted.

In this case, Oracle stores the data for the row in a chain of data blocks one or more reserved for that segment.

500 Oracle interview questions and answers - Oracle FAQ PDF.pdf

Have you prepared for your interview, can you answer these basic Interview questions on Oracle. It lets its users to retrieve and to store data in a way that multiple users can access similar data at the same time. Oracle achieves this with high efficiency. Many security checks are followed to limit access to authorized users only and to retrieve data in case of accidental data loss. An Oracle database can be termed as a compilation of data housed in a database server and treated like a large unit.

In order to properly compare candidates, they need to answer questions of the same difficulty level , and different questions always mean different difficulty levels. However, the order of questions and answers is randomized for each applicant. For example, you have 5 candidates who get scores of 35, 45, 60, 65, and 80, based on a maximum possible score of The test is presented in a multiple-choice, or quiz, format , rather than requiring test takers to write code. If we used a coding test instead, we would have to check all answers manually, which would obviously be impossible. The test can also be used to test junior programmers, but you should reduce your acceptance score drastically to compensate. Likewise, you can use it to test senior SQL developers as well, with an increased acceptance score.

There are a lot of opportunities from many reputed companies in the world. According to research, Oracle DBA has a market share of about 0. This course will help you to achieve excellence in this domain. Oracle automatically maintains and uses indexes and when any change is made in the table data Oracle automatically distributes it into relevant indexes. Oracle usually publishes a major release once a 4 year.

Oracle dba interview questions and answers

Welcome to Mindmajix - The leading global online training platform. There are a lot of opportunities from many reputed companies in the world. This course will help you to achieve excellence in this domain. SQL is a language used to communicate with the server to access, manipulate, and control data.

IntegrityConstraints Itcanbecalledasadeclarativewayinordertodefinea businessruleforatable'scolumn. Itcanbecalledasanoptionalstructurewhichisassociated withatablefordirectaccesstotherows Indexcanbecreatedforoneormorecolumnsinatable. Itcanbedefinedasaspecificnumberofcontiguousdata blocksinsingleallocation.

Varchar can store upto bytes and varchar2 can store upto bytes. Both are differed with respect to space. RAW datatype is used to store values in binary data format. The maximum size for a raw in a table in bytes. Example is —.

Он улыбнулся. ОБЪЕКТ: ДЭВИД БЕККЕР - ЛИКВИДИРОВАН Пора. Халохот проверил оружие, решительно направился вперед и осмотрел площадку. Левый угол пуст. Следуя плану, он бросился в проход и, оказавшись внутри, лицом к правому углу, выстрелил.

Откуда-то сверху падали пульсирующие стробоскопические вспышки света, придававшие всему этому сходство со старым немым кино. У дальней стены дрожали включенные на полную мощность динамики, и даже самые неистовые танцоры не могли подойти к ним ближе чем на десять метров. Беккер заткнул уши и оглядел толпу. Куда бы ни падал его взгляд, всюду мелькали красно-бело-синие прически.

Мы будем ждать. Джабба открыл рот. - Но, директор, ведь это… - Риск, - прервал его Фонтейн.

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Oracle Interview Questions and Answers Pdf. 1. What is Oracle and what are its different editions? Answer: Oracle is one of the popular database provided by.

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Synonyms, Cluster.

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