Oracle DBA Interview Questions, Answers, and Explanations: Oracle Database Administrator Certificati

Frequently asked Oracle dba Interview Questions with detailed answers and examples. Want to become certified Oracle Database Administrator? CTA.
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The datafiles contain all the database data.

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The data of logical database structures, such as tables and indexes, is physically stored in the datafiles allocated for a database. Every Oracle database has a control file. A control file contains entries that specify the physical structure of the database such as Database name and the Names and locations of datafiles and redo log files. Answer The primary function of the redo log is to record all changes made to data.

If a failure prevents modified data from being permanently written to the datafiles, then the changes can be obtained from the redo log, so work is never lost. This prevents oracle from overwriting the redo log files before they have been safely archived to another location. Parameter files contain a list of configuration parameters for that instance and database. A user account and its associated data including tables, views, indexes, clusters, sequences,procedures, functions, triggers,packages and database links is known as Oracle schema.

Data Blocks are the base unit of logical database space.

Top Oracle DBA Interview Questions And Answers

Each data block represents a specific number of bytes of database space on a disk. The datablocks can be 4K,8 K size depending on the requirement. Extent is a collection of Continuous data blocks, which is used for storing a specific type of information. A segment is a collection of extents which is used for storing a specific data structure and resides in the same tablespace.

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Database contain one or more Rollback Segments to roll back transactions and data recovery. We all know that redo logs stored the redo information and redo log files are in circular fashion. Oracle Database lets you save filled groups of redo log files to one or more offline destinations, known collectively as the archived redo log.

The process of turning redo log files into archived redo log files is called archiving. The background process ARCn automates archiving operations when automatic archiving is enabled. The database starts multiple archiver processes as needed to ensure that the archiving of filled redo logs does not fall behind.

No archive log means archive log are not generted and redo are overwritten 16 What all things are present in the shared pool? The shared pool portion of the SGA contains three major areas: If the database must be up and running 24 hours a day, seven days a week, then you have no choice but to perform inconsistent backups of the whole database. A backup of online data files is called an online backup. Oracle Enqueue and locks Oracle table locks: How can you determine which shared memory and semaphores are associated with which instance?

A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of slower writes and increased storage space. By default, Oracle creates B-tree indexes.

A standby database is a database replica created by taking a backup of a primary database. Oracle provides software to create and manage the Oracle database. The database consists of physical and logical structures in which system, user, and control information is stored. A database buffer cache stores the data in memory for quicker access.

The redo logs track and store all the changes made to the database.

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A Data Guard ensures data protection and high availability of data and control file records the physical structure of the database. Click on the above link to read more and to become a Oracle DBA.


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DBA has the authority to create new users, remove existing users or modify any of the environment variables or privileges assigned to other users. Want to become certified Oracle Database Administrator? What are different Oracle database objects?


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    6. The objects as such can be stored in the database. The language of the DBMS can be integrated with an object- oriented programming language. The language may even be exactly the same as that used in the application, which does not force the programmer to have two representations of his objects. An index is an optional structure associated with a table to have direct access to rows, which can be created to increase the performance of data retrieval.

    Index can be created on one or more columns of a table. The following are some of the products, tools, and utilities you can use in achieving your goals as a database administrator.

    Oracle DBA interview questions

    It can automatically launch the Database Configuration Assistant to install a database. It enables you to copy a preconfigured seed database, thus saving the time and effort of customizing and generating a database from scratch. After you have installed the Oracle software, created or upgraded a database, and configured the network, you can use Oracle Enterprise Manager as the single interface for managing your database.

    Clustering is one technology used to create a grid infrastructure. Simple clusters have static resources for specific applications by specific owners.

    Grids, which can consist of multiple clusters, are dynamic resource pools shareable among many different applications and users. A grid does not assume that all servers in the grid are running the same set of applications.

    Oracle DBA interview questions

    Applications can be scheduled and migrated across servers in the grid. Grids share resources from and among independent system owners. At the highest level, the idea of grid computing is computing as a utility. Navaneeth rated it liked it Mar 05, Paramesuennam rated it really liked it Jul 17, Shiva rated it it was amazing Nov 08, Vinay rated it did not like it May 10, Srikanth added it Mar 25, Preethisinghthakur added it Jul 11, Samir added it Nov 29, Vicky added it Mar 27, Mandar added it Apr 08, Surender marked it as to-read Jul 11, Raghuvir added it Jul 19, Sreedhar marked it as to-read Jul 22, Umesh Kumar added it Sep 24, Sidk added it Dec 17, Syed added it Jan 11, Ilyas Gaffar added it Feb 25, Deepak Pushkarna added it Mar 17, Riju Ray added it Apr 01, Srikanth marked it as to-read Apr 03, Arun marked it as to-read May 29,