Oracle Database Administrator Interview Questions And Answers – If you are looking for Oracle DBA Interview Questions for Experience or Freshers then you are at right place. There are many opportunities from many well-known companies in the world. According to research, Oracle DBA has a market share of around 0.7%.
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Oracle Database Administrator Interview Questions And Answers
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Oracle DBA Interview Questions for Beginners Q1. List four possible ways (direct or indirect) executing SQL query against the Oracle database?
Q2. What is SQL*Plus? How to get it and what operations can be done with it?
The answer. Oracle automatically maintains and uses indexes, and when any changes are made to the table data, Oracle automatically distributes them to the appropriate indexes.
Related article: Manage Redo Log Q4. In our organization we use Oracle database version 11.2.0.4. Explain what each number represents?
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The answer. “11”: This first number indicates the base database version. Oracle usually publishes a major release once every 4 years. This number is usually followed by a symbol that describes the nature of the problem. For example: 9i (internet), 10g (web), 11g (web), 12c (cloud).
“2”: This second number indicates the release number of the software maintenance. Oracle publishes a major release as maintenance release 1 and then typically publishes a second maintenance release throughout the software’s lifetime. New features are added to the database software with maintenance releases.
“4”: The fourth number is called the Component-Specific Release Number and indicates the firmware update applied to the firmware. Patch set updates are published by Oracle 4 times a year, and this fourth number is advanced when you apply it to your database software.
The answer. A synonym is an identifier that can be used to refer to another database object in an SQL statement. The type of database object that can be synonymous is table, view, sequence, or other synonyms.
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Q6. Your customer has reported that he has forgotten the password of database user “SYSTEM” and is unable to reconnect. How do you reset this admin password?
Related Article: Assigning Roles and Privileges in Oracle DBA Q7. What is a password file and why do you need it?
The answer. Passwords for database users are stored in the database’s data dictionary. When a user wants to access 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 will be available as long as the database is open. Passwords for administrators are also stored in the dictionary.
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When the database is shut down, the data dictionary will not be available. There should be a mechanism for the administrator to access the database even if it is shut down, since it is one of the administrator’s responsibilities to start the database down. The password file is a separate operating system file that is stored on a disk external to the database.
For users with SYSDBA or SYSOPER privileges, the username and password are stored there. Administrators with these privileges are authenticated using this password file even when the database is down.
Q8. You want to know how many users are defined in the password file and what privileges the users have. How would you apply this?
The answer. You should query the “v$pwfile_users” view to get information about the users in the password file. Execute the following SQL query:
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The above query will return four columns for each user in the password file. The column names are USERNAME, SYSDBA, SYSOPER, and SYSASM.
The answer. The main task of the Oracle DBA is to keep the Oracle Databases organized and running. This may involve installing and configuring the database from scratch.
In a running system, the DBA will be the only person with privileges who can shutdown and start the database.
Will perform regular backups to ensure data is safe. In the event of a disaster, it will be responsible for restoring the database from backup. It needs to monitor space usage and do capacity planning for the database.
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He will be responsible for the implementation of the security policy. It should monitor database activity. He will need to adjust the database to run at a reasonable speed.
Related blog: Managing Rollback Tablespace – Oracle DBA Q8. How does the Oracle DBA role differ from the Oracle Developer role in an organization? Are there similarities between the two?
The answer. Oracle developers are primarily responsible for developing backend applications. They perform data modeling according to business rules. Design creates tables, indexes, and other constraints. They are expected to know SQL and PL/SQL. They develop procedures using this language.
On the other hand, the main duties of an Oracle DBA are to perform maintenance, take backups, implement security policies, etc. to keep the database up and running. is to manage the database, which includes tasks such as
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As a developer, a DBA is expected to have a good knowledge of SQL and PL/SQL, as these are also required for database administration.
Depending on the organizational structure, the DBA may also be assigned development tasks, or at least assist developers as needed.
Q9. There are 10 identical servers and you want to install Oracle Database on each of them. What do you use to automate the installation process?
The answer. If you are going to do a batch installation, it is best to do it in silent mode with Oracle Universal Installer. For a single installation, it is best to run the installer in “interactive mode” and set the installation options in each window.
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However, this will take longer on bulk installations. You should do the installation in “silent” mode with “answer file”. In a silent installation, you run the Oracle Universal Installer from a command prompt and specify the location of the “response file”.
Setup files and response files can be shared between servers via NFS, so there is no need to copy the setup files to each server.
Q10. You want to create an answer file to speed up the database installation. How do you prepare the answer file?
The answer. The response file is a plain text file that stores the database creation options. It is possible to create it manually from scratch, but it will take longer and be buggy.
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The installation media comes with a template response file. It is easier to adjust it manually. This file also contains notes about settings.
However, the easiest and most reliable way to generate the answer file is to use the Oracle Universal Installer. If you run the installer in “record” mode, each option you select in each step will automatically be recorded in the correct format in the answer file. After the installation is completed in “recording” mode, you will have a complete response file with all the options installed in it.
The answer. It is also possible to create a database through an SQL script. In this script I will define:
The answer. This instance consists of a shared memory area in RAM called the System Global Area (SGA) and background processes.
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The Global System area and background processes are created when the instance is “started”. When for example “shutdown”, the process is killed and the shared memory area is “released” back to the operating system.
The answer. Oracle databases live on disk and are persistent. It consists of files stored on disk. These files can be divided into three types:
The answer. The settings file stores the instance settings that govern how the instance works. Oracle needs to find this file to run the instance.
The search order is as follows: /DBS/spfile.ora – This is the server configuration file and is the first place Oracle will look. The SID is the service identifier of the instance.
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<$ORACLE_HOME-/dbs/spfile.ora – If Oracle cannot find the file in the first place, it will look for this file. Here is another server configuration file.
/dbs/init.ora – This is the settings file and is plain text. If Oracle cannot find the two files listed above, it will look for these files. This is the last place to look.
Start Studying: Oracle Performance Tuning Interview Questions Q17. You want to perform maintenance on your database, but you don’t want any users to be able to connect to the database during the maintenance period. How would you apply this?
The answer. Any user with the “CREATE SESSION” privilege can create a connection when the database is open. However, it is possible to open the database
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